Health A to Z
- AAA screening, see Abdominal aortic aneurysm (AAA) screening
- AAA, see Abdominal aortic aneurysm
- Abdominal aortic aneurysm
- Abdominal aortic aneurysm (AAA) screening
- Abortion
- Acanthosis nigricans
- Achalasia
- Acid and chemical burns
- Acid reflux in babies, see Reflux in babies
- Acne
- Acoustic neuroma (vestibular schwannoma)
- Acromegaly
- Actinic keratoses (solar keratoses)
- Actinomycosis
- Acupuncture
- Acute cholecystitis
- Acute kidney injury
- Acute lymphoblastic leukaemia
- Acute myeloid leukaemia
- Acute pancreatitis
- Acute respiratory distress syndrome (ARDS)
- Addison's disease
- Adenoidectomy
- Adenomyosis
- ADHD in adults
- ADHD in children and young people
- Age-related macular degeneration (AMD)
- Agoraphobia
- Albinism
- Alcohol misuse
- Alcohol poisoning
- Alcohol-related liver disease
- Alexander technique
- Alkaptonuria
- Allergic rhinitis
- Allergies
- Altitude sickness
- Alzheimer's disease
- Amblyopia, see Lazy eye
- Amnesia, see Memory loss (amnesia)
- Amniocentesis
- Amputation
- Amyloidosis
- Anabolic steroid misuse
- Anaemia (iron deficiency), see Iron deficiency anaemia
- Anaemia (vitamin B12 or folate deficiency), see Vitamin B12 or folate deficiency anaemia
- Anal cancer
- Anal fissure
- Anal fistula
- Anal pain
- Anaphylaxis
- Androgen insensitivity syndrome
- Aneurysm (abdominal aortic), see Abdominal aortic aneurysm
- Aneurysm (brain), see Brain aneurysm
- Angelman syndrome
- Angina
- Angioedema
- Angiography
- Angioplasty, see Coronary angioplasty and stent insertion
- Animal and human bites
- Ankle pain
- Ankylosing spondylitis
- Anorexia nervosa
- Anosmia, see Lost or changed sense of smell
- Antacids
- Antibiotics
- Anticoagulant medicines
- Antidepressants
- Antifungal medicines
- Antihistamines
- Antiphospholipid syndrome (APS)
- Antisocial personality disorder
- Anus (itchy), see Itchy bottom
- Anxiety disorders in children
- Aortic valve replacement
- Aphasia
- Appendicitis
- Arrhythmia, see Heart rhythm problems (arrhythmia)
- Arthritis
- Arthroscopy
- Asbestosis
- Asperger's, see Autism
- Aspergillosis
- Asthma
- Astigmatism
- Ataxia
- Atherosclerosis
- Athlete's foot
- Atopic eczema
- Atrial fibrillation
- Auditory processing disorder (APD)
- Autism
- Autosomal dominant polycystic kidney disease
- Autosomal recessive polycystic kidney disease
- Avian flu, see Bird flu
- Baby
- Back pain
- Bacterial vaginosis
- Bad breath
- Baker's cyst
- Balanitis
- Barium enema
- Bartholin's cyst
- BCG vaccine for tuberculosis (TB)
- Bedbugs
- Bedwetting in children
- Behçet's disease
- Being sick, see Diarrhoea and vomiting
- Bell's palsy
- Benign brain tumours, see Non-cancerous (benign) brain tumours
- Benign prostate enlargement
- Beta blockers
- Bile duct cancer (cholangiocarcinoma)
- Bilharzia, see Schistosomiasis (bilharzia)
- Binge eating disorder
- Biopsy
- Bipolar disorder
- Bird flu
- Birthmarks
- Bite (animal or human), see Animal and human bites
- Black eye
- Bladder cancer
- Bladder pain syndrome (interstitial cystitis)
- Bladder stones
- Bleeding after the menopause, see Postmenopausal bleeding
- Bleeding between periods or after sex, see Vaginal bleeding between periods or after sex
- Bleeding from the bottom (rectal bleeding)
- Blepharitis
- Blindness and vision loss
- Blisters
- Bloating
- Blood groups
- Blood in semen
- Blood in urine
- Blood poisoning, see Sepsis
- Blood pressure (low), see Low blood pressure (hypotension)
- Blood pressure test
- Blood tests
- Blood transfusion
- Blue or grey skin or lips (cyanosis)
- Blushing
- Body dysmorphic disorder (BDD)
- Body odour (BO)
- Boils
- Bone cancer
- Bone cyst
- Bone density scan (DEXA scan)
- Borderline personality disorder
- Botulism
- Bowel cancer
- Bowel cancer screening
- Bowel incontinence
- Bowel polyps
- Bowen's disease
- Braces and orthodontics
- Brachycephaly and plagiocephaly, see Plagiocephaly and brachycephaly (flat head syndrome)
- Brain abscess
- Brain aneurysm
- Brain death
- Brain haemorrhage, see Subarachnoid haemorrhage
- Brain tumour (malignant), see Malignant brain tumour (brain cancer)
- Brain tumours
- Brain tumours (benign), see Non-cancerous (benign) brain tumours
- Breast abscess
- Breast cancer in men
- Breast cancer in women
- Breast lumps
- Breast pain
- Breast reduction on the NHS
- Breast screening (mammogram)
- Breath-holding in babies and children
- Broken ankle
- Broken arm or wrist
- Broken collarbone
- Broken finger or thumb
- Broken hip
- Broken leg
- Broken nose
- Broken or bruised ribs
- Broken toe
- Bronchiectasis
- Bronchiolitis
- Bronchitis
- Bronchodilators
- Brucellosis
- Brugada syndrome
- Bruxism, see Teeth grinding (bruxism)
- Bulging eyes (exophthalmos)
- Bulimia
- Bullous pemphigoid
- Bunions
- Burns and scalds
- Bursitis
- Buttock pain, see Sciatica
- CABG, see Coronary artery bypass graft
- Caesarean section
- Cancer
- Cannabis oil (medical cannabis), see Medical cannabis (and cannabis oils)
- Carbon monoxide poisoning
- Cardiac catheterisation and coronary angiography
- Cardiomyopathy
- Cardiovascular disease
- Carotid endarterectomy
- Carpal tunnel syndrome
- Cat bites, see Animal and human bites
- Cataract surgery
- Cataracts (age-related), see Cataracts in adults
- Cataracts (children), see Childhood cataracts
- Cataracts in adults
- Catarrh
- Cavernoma
- Cavernous sinus thrombosis
- Cellulitis
- Cerebral palsy
- Cervical cancer
- Cervical screening
- Cervical spondylosis
- Charcot-Marie-Tooth disease
- Charles Bonnet syndrome
- Chemotherapy
- Chest infection
- Chest pain
- Chiari malformation
- Chickenpox
- Chickenpox vaccine
- Chilblains
- Childhood cataracts
- Children's flu vaccine
- Chipped, broken or cracked tooth
- Chiropractic
- Chlamydia
- Cholecystitis (acute), see Acute cholecystitis
- Cholera
- Cholesteatoma
- Cholesterol (high), see High cholesterol
- Chorionic villus sampling
- Chronic fatigue syndrome (ME/CFS), see Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS)
- Chronic kidney disease
- Chronic lymphocytic leukaemia
- Chronic myeloid leukaemia
- Chronic obstructive pulmonary disease (COPD)
- Chronic pancreatitis
- Chronic traumatic encephalopathy
- Circumcision in boys
- Circumcision in men
- Cirrhosis
- CJD, see Creutzfeldt-Jakob disease
- Claustrophobia
- Cleft lip and palate
- Clinical trials
- Clostridium difficile (C. diff) infection
- Club foot
- Cluster headaches
- Coccyx pain, see Tailbone (coccyx) pain
- Coeliac disease
- Cognitive behavioural therapy (CBT)
- Cold sores
- Colic
- Colon cancer, see Bowel cancer
- Colonoscopy
- Colostomy
- Colour blindness, see Colour vision deficiency (colour blindness)
- Colour vision deficiency (colour blindness)
- Colposcopy
- Combined pill
- Common cold
- Compartment syndrome
- Complementary and alternative medicine
- Complex regional pain syndrome
- Concussion, see Head injury and concussion
- Condoms
- Confusion (sudden), see Sudden confusion (delirium)
- Congenital heart disease
- Congenital hip dislocation, see Developmental dysplasia of the hip
- Conjunctivitis
- Consent to treatment
- Constipation
- Contact dermatitis
- Continuous glucose monitoring and hybrid closed loop for diabetes
- Contraception
- Contraceptive implant
- Contraceptive injection
- Contraceptive patch
- Cornea transplant
- Corns and calluses
- Coronary angioplasty and stent insertion
- Coronary artery bypass graft
- Coronary heart disease
- Coronavirus, see COVID-19
- Corticobasal degeneration
- Corticosteroid cream, see Topical corticosteroids
- Corticosteroids, see Steroids
- Cosmetic procedures
- Costochondritis
- Cough
- Coughing up blood (blood in phlegm)
- Counselling
- COVID-19
- COVID-19 rapid lateral flow test
- COVID-19 vaccine
- Cradle cap
- Craniosynostosis
- Creutzfeldt-Jakob disease
- Crohn's disease
- Croup
- CT scan
- Cushing's syndrome
- Cuts and grazes
- Cyanosis, see Blue or grey skin or lips (cyanosis)
- Cyclical vomiting syndrome
- Cyclospora
- Cystic fibrosis
- Cystitis
- Cystoscopy
- Cytomegalovirus (CMV)
- Dandruff
- Deafblindness
- Deafness, see Hearing loss
- Decongestants
- Dehydration
- Delirium, see Sudden confusion (delirium)
- Dementia
- Dementia (frontotemporal), see Frontotemporal dementia
- Dementia (vascular), see Vascular dementia
- Dementia with Lewy bodies
- Dengue
- Dental abscess
- Dental pain, see Toothache
- Dentures (false teeth)
- Depression
- Depression in adults
- Detached retina (retinal detachment)
- Developmental co-ordination disorder (dyspraxia) in children
- Developmental dysplasia of the hip
- DEXA scan, see Bone density scan (DEXA scan)
- Diabetes
- Diabetes (type 1), see Type 1 diabetes
- Diabetes (type 2), see Type 2 diabetes
- Diabetes in pregnancy, see Gestational diabetes
- Diabetes insipidus
- Diabetic eye screening
- Diabetic ketoacidosis
- Diabetic retinopathy
- Dialysis
- Diaphragm or cap
- Diarrhoea and vomiting
- Diarrhoea, see Diarrhoea and vomiting
- Differences in sex development
- DiGeorge syndrome (22q11 deletion)
- Diphtheria
- Discoid eczema
- Dislocated kneecap
- Dislocated shoulder
- Dissociative disorders
- Diverticular disease and diverticulitis
- Dizziness
- Do not attempt cardiopulmonary resuscitation (DNACPR) decisions
- Dog bites, see Animal and human bites
- Double vision
- Down's syndrome
- Dry eyes
- Dry lips, see Sore or dry lips
- Dry mouth
- Dupuytren's contracture
- DVT (deep vein thrombosis)
- Dwarfism, see Restricted growth (dwarfism)
- Dysarthria (difficulty speaking)
- Dysentery
- Dyslexia
- Dysphagia (swallowing problems)
- Dyspraxia (developmental co-ordination disorder) in adults
- Dyspraxia in children, see Developmental co-ordination disorder (dyspraxia) in children
- Dystonia
- Ear infections
- Earache
- Eardrum (burst), see Perforated eardrum
- Early or delayed puberty
- Early or premature menopause
- Earwax build-up
- Eating disorders
- Ebola virus disease
- Echocardiogram
- Ectopic beats, see Heart palpitations
- Ectopic pregnancy
- Ectropion
- Eczema (atopic), see Atopic eczema
- Eczema (contact dermatitis), see Contact dermatitis
- Eczema (discoid), see Discoid eczema
- Eczema (varicose), see Varicose eczema
- Edwards' syndrome (trisomy 18)
- Ehlers-Danlos syndromes
- Ejaculation problems
- Elbow and arm pain
- Electrocardiogram (ECG)
- Electroencephalogram (EEG)
- Electrolyte test
- Emergency contraceptive pill (morning after pill)
- Emollients
- Empyema
- Encephalitis
- Endocarditis
- Endometrial cancer, see Womb (uterus) cancer
- Endometriosis
- Endoscopy
- Enhanced recovery
- Epidermolysis bullosa
- Epididymitis
- Epidural
- Epiglottitis
- Epilepsy
- Erectile dysfunction (impotence)
- Erythema multiforme
- Erythema nodosum
- Erythrocytosis
- Erythromelalgia
- Essential tremor, see Tremor or shaking hands
- Euthanasia and assisted suicide
- Excessive daytime sleepiness (hypersomnia)
- Excessive hair growth (hirsutism)
- Excessive sweating (hyperhidrosis)
- Excessive thirst
- Eye cancer
- Eye cancer in children, see Retinoblastoma
- Eye flashes, see Floaters and flashes in the eyes
- Eye floaters, see Floaters and flashes in the eyes
- Eye infection (herpes), see Herpes simplex eye infections
- Eye injuries
- Eye tests for children
- Eyelid problems
- Fabricated or induced illness
- Face blindness, see Prosopagnosia (face blindness)
- Fainting
- Falls
- Farting (flatulence)
- Febrile seizures
- Feeling sick (nausea)
- Female genital mutilation (FGM)
- Female sterilisation
- Femoral hernia repair
- Fetal alcohol spectrum disorder
- Fever in adults, see High temperature (fever) in adults
- Fever in children, see High temperature (fever) in children
- Fibroids
- Fibromyalgia
- Finger pain
- First aid
- Fits (children with fever), see Febrile seizures
- Fits (seizures), see What to do if someone has a seizure (fit)
- Flat feet
- Flat head syndrome, see Plagiocephaly and brachycephaly (flat head syndrome)
- Flatulence, see Farting (flatulence)
- Floaters and flashes in the eyes
- Flu
- Flu vaccine
- Food allergy
- Food colours and hyperactivity
- Food intolerance
- Food poisoning
- Foot drop
- Foot pain
- Foreskin problems, see Tight foreskin (phimosis)
- Frontotemporal dementia
- Frostbite
- Frozen shoulder
- Functional neurological disorder, see Medically unexplained symptoms
- Fungal nail infection
- Gallbladder cancer
- Gallbladder pain, see Acute cholecystitis
- Gallbladder removal
- Gallstones
- Ganglion cyst
- Gangrene
- Gastrectomy
- Gastritis
- Gastro-oesophageal reflux disease (GORD), see Heartburn and acid reflux
- Gastroenteritis, see Diarrhoea and vomiting
- Gastroparesis
- Gastroscopy
- Gender dysphoria
- General anaesthetic
- Generalised anxiety disorder (GAD)
- Genetic and genomic testing
- Genetic test for cancer gene, see Predictive genetic tests for cancer risk genes
- Genital herpes
- Genital warts
- German measles, see Rubella (german measles)
- Gestational diabetes
- Giant cell arteritis, see Temporal arteritis
- Giardiasis
- Gigantism, see Acromegaly
- Gilbert's syndrome
- Glandular fever
- Glaucoma
- Glomerulonephritis
- Glue ear
- Glutaric aciduria type 1
- Goitre
- Gonorrhoea
- Gout
- Granuloma annulare
- Granulomatosis with polyangiitis (GPA)
- Group B strep
- Growing pains
- Guillain-Barré syndrome
- Gum disease
- Gynaecomastia
- Haemochromatosis
- Haemophilia
- Haemophilus influenzae type b (Hib)
- Haemorrhoids, see Piles (haemorrhoids)
- Hair dye reactions
- Hair loss
- Halitosis, see Bad breath
- Hallucinations and hearing voices
- Hamstring injury
- Hand pain
- Hand tendon repair
- Hand, foot and mouth disease
- Having an operation (surgery)
- Hay fever
- Head and neck cancer
- Head injury and concussion
- Head lice and nits
- Headaches
- Headaches (tension-type), see Tension headaches
- Health anxiety
- Hearing aids and implants
- Hearing loss
- Hearing tests
- Hearing voices, see Hallucinations and hearing voices
- Heart attack
- Heart block
- Heart bypass, see Coronary artery bypass graft
- Heart disease (coronary), see Coronary heart disease
- Heart failure
- Heart pain, see Chest pain
- Heart palpitations
- Heart rhythm problems (arrhythmia)
- Heart valve disease
- Heart valve replacement, see Aortic valve replacement
- Heartburn and acid reflux
- Heat exhaustion and heatstroke
- Heat rash (prickly heat)
- Heavy periods
- Heel pain
- Help for suicidal thoughts
- Henoch-Schönlein purpura (HSP)
- Hepatitis
- Hepatitis A
- Hepatitis B
- Hepatitis B vaccine
- Hepatitis C
- Herbal medicines
- Hereditary haemorrhagic telangiectasia (HHT)
- Hereditary spastic paraplegia
- Hernia
- Hernia (femoral), see Femoral hernia repair
- Hernia (hiatus), see Hiatus hernia
- Hernia (inguinal), see Inguinal hernia repair
- Hernia (umbilical), see Umbilical hernia repair
- Herpes (genital), see Genital herpes
- Herpes in babies, see Neonatal herpes (herpes in a baby)
- Herpes simplex eye infections
- Herpetic whitlow (whitlow finger)
- Hiatus hernia
- Hib, see Haemophilus influenzae type b (Hib)
- Hib/MenC vaccine
- Hiccups
- Hidradenitis suppurativa (HS)
- High blood pressure
- High blood sugar (hyperglycaemia)
- High cholesterol
- High temperature (fever) in adults
- High temperature (fever) in children
- Hip dysplasia, see Developmental dysplasia of the hip
- Hip pain in adults
- Hip pain in children (irritable hip)
- Hip replacement
- Hirschsprung's disease
- Hirsutism, see Excessive hair growth (hirsutism)
- HIV and AIDS
- Hives
- Hoarding disorder
- Hodgkin lymphoma
- Home oxygen therapy
- Homeopathy
- Homocystinuria
- Hookworm, see Worms in humans
- How to check your breasts or chest
- How to check your testicles
- How to collect a sample of poo (stool sample)
- HPV vaccine
- Hughes syndrome, see Antiphospholipid syndrome (APS)
- Human bites, see Animal and human bites
- Human papillomavirus (HPV)
- Huntington's disease
- Hydrocephalus
- Hydronephrosis
- Hyperacusis, see Noise sensitivity (hyperacusis)
- Hyperhidrosis, see Excessive sweating (hyperhidrosis)
- Hyperparathyroidism
- Hypersomnia, see Excessive daytime sleepiness (hypersomnia)
- Hypertension, see High blood pressure
- Hyperthyroidism, see Overactive thyroid (hyperthyroidism)
- Hypnotherapy
- Hypoglycaemia, see Low blood sugar (hypoglycaemia)
- Hypoparathyroidism
- Hypotension, see Low blood pressure (hypotension)
- Hypothermia
- Hypothyroidism, see Underactive thyroid (hypothyroidism)
- Hysterectomy
- Hysteroscopy
- IBD, see Inflammatory bowel disease
- IBS, see Irritable bowel syndrome (IBS)
- Ichthyosis
- Idiopathic pulmonary fibrosis
- Ileostomy
- Impetigo
- Impotence, see Erectile dysfunction (impotence)
- Incontinence (urinary), see Urinary incontinence
- Indigestion
- Infected piercings
- Infertility
- Inflammatory bowel disease
- Influenza, see Flu
- Ingrown hairs
- Ingrown toenail
- Inguinal hernia repair
- Insect bites and stings
- Insomnia
- Intensive care
- Internal (female) condoms
- Intersex, see Differences in sex development
- Interstitial cystitis, see Bladder pain syndrome (interstitial cystitis)
- Intracranial hypertension
- Intrauterine insemination (IUI)
- Iron deficiency anaemia
- Irregular periods
- Irritable bowel syndrome (IBS)
- Irritable hip, see Hip pain in children (irritable hip)
- Isovaleric acidaemia
- Itchy bottom
- Itchy skin
- IUD (intrauterine device) or copper coil
- IUS (intrauterine system) or hormonal coil
- IVF
- Kawasaki disease
- Keloid scars
- Keratosis pilaris
- Kidney cancer
- Kidney failure, see Chronic kidney disease
- Kidney infection
- Kidney stones
- Klinefelter syndrome
- Knee cartilage damage, see Meniscus tear (knee cartilage damage)
- Knee ligament surgery
- Knee pain
- Knee replacement
- Knock knees
- Knocked-out tooth
- Kyphosis
- Labial fusion
- Labyrinthitis and vestibular neuritis
- Lactate dehydrogenase (LDH) test
- Lactose intolerance
- Lambert-Eaton myasthenic syndrome
- Laparoscopy (keyhole surgery)
- Laryngeal (larynx) cancer
- Laryngitis
- Laser eye surgery and lens surgery
- Laxatives
- Lazy eye
- Learning disabilities
- Leg cramps
- Leg ulcer, see Venous leg ulcer
- Legionnaires' disease
- Leptospirosis (Weil's disease)
- Leukaemia (acute lymphoblastic), see Acute lymphoblastic leukaemia
- Leukaemia (acute myeloid), see Acute myeloid leukaemia
- Leukaemia (chronic lymphocytic), see Chronic lymphocytic leukaemia
- Leukoplakia
- Lichen planus
- Lichen sclerosus
- Limping in children
- Lipoedema
- Lipoma
- Lips (sore or dry), see Sore or dry lips
- Listeriosis
- Liver cancer
- Liver disease
- Liver disease (alcohol-related), see Alcohol-related liver disease
- Local anaesthesia
- Long QT syndrome
- Long-sightedness
- Lost or changed sense of smell
- Low blood pressure (hypotension)
- Low blood sugar (hypoglycaemia)
- Low sex drive (loss of libido)
- Low sperm count
- Low white blood cell count
- Low-grade brain tumours, see Non-cancerous (benign) brain tumours
- Lower back pain, see Back pain
- Lumbago, see Back pain
- Lumbar decompression surgery
- Lumbar puncture
- Lumps
- Lung cancer
- Lung cancer screening
- Lupus
- Lyme disease
- Lymphoedema
- Macular degeneration (age-related), see Age-related macular degeneration (AMD)
- Macular hole
- Magnesium test
- Malaria
- Male menopause, see The 'male menopause'
- Male sterilisation, see Vasectomy
- Malignant brain tumour (brain cancer)
- Mallet finger
- Malnutrition
- Mammogram, see Breast screening (mammogram)
- Maple syrup urine disease
- Marfan syndrome
- Mastectomy
- Mastitis
- Mastocytosis
- Mastoiditis
- MCADD
- Measles
- Medical cannabis (and cannabis oils)
- Medically unexplained symptoms
- Medicines information
- Melanoma skin cancer
- Memory loss (amnesia)
- MenACWY vaccine
- MenB vaccine
- Meningitis
- Meniscus tear (knee cartilage damage)
- Menopause
- Menopause (early), see Early or premature menopause
- Menstrual pain, see Period pain
- Mesothelioma
- Metabolic syndrome
- Metallic taste
- Metatarsalgia, see Pain in the ball of the foot
- Middle East respiratory syndrome (MERS)
- Migraine
- Miscarriage
- Missed or late periods
- MMR (measles, mumps and rubella) vaccine
- Molar pregnancy
- Moles
- Molluscum contagiosum
- Morton's neuroma
- Motion sickness
- Motor neurone disease (MND)
- Mouth cancer
- Mouth thrush, see Oral thrush (mouth thrush)
- Mouth ulcers
- Mpox
- MRI scan
- MRSA
- Mucositis
- Multiple myeloma
- Multiple sclerosis
- Multiple system atrophy (MSA)
- Mumps
- Munchausen syndrome
- Muscular dystrophy
- Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS)
- Myasthenia gravis
- Myelodysplastic syndrome (MDS)
- Myeloma, see Multiple myeloma
- Myopia, see Short-sightedness (myopia)
- Myositis
- Ménière's disease
- Nail fungal infection, see Fungal nail infection
- Nail patella syndrome
- Nail problems
- Nappy rash
- Narcolepsy
- Nasal and sinus cancer
- Nasal polyps
- Nasopharyngeal cancer
- Natural family planning
- Nausea, see Feeling sick (nausea)
- Neck pain
- Necrotising fasciitis
- Neonatal herpes (herpes in a baby)
- Nephrotic syndrome in children
- Neurofibromatosis type 1
- Neurofibromatosis type 2
- Neuromyelitis optica (NMO)
- Newborn jaundice
- Newborn respiratory distress syndrome
- NHS screening
- Night sweats
- Night terrors and nightmares
- Nipple discharge
- Noise sensitivity (hyperacusis)
- Non-alcoholic fatty liver disease (NAFLD)
- Non-allergic rhinitis
- Non-cancerous (benign) brain tumours
- Non-gonococcal urethritis, see Urethritis
- Non-Hodgkin lymphoma
- Non-melanoma skin cancer
- Noonan syndrome
- Norovirus (vomiting bug)
- Nose cancer, see Nasal and sinus cancer
- Nosebleed
- NSAIDs
- Obesity
- Obsessive compulsive disorder (OCD)
- Obstructive sleep apnoea, see Sleep apnoea
- Occupational therapy
- Oesophageal atresia and tracheo-oesophageal fistula
- Oesophageal cancer
- Oral thrush (mouth thrush)
- Orf
- Orthodontics
- Osteoarthritis
- Osteomalacia, see Rickets and osteomalacia
- Osteomyelitis
- Osteopathy
- Osteophyte (bone spur)
- Osteoporosis
- Otosclerosis
- Ovarian cancer
- Ovarian cyst
- Overactive thyroid (hyperthyroidism)
- Ovulation pain
- Oxygen therapy, see Home oxygen therapy
- Pacemaker implantation
- Paget's disease of bone
- Paget's disease of the nipple
- Pain in testicles, see Testicle pain
- Pain in the back of the hand
- Pain in the ball of the foot
- Pain in the bottom of the foot
- Pain in the palm of the hand
- Pain in the top of the foot
- Painful bladder syndrome, see Bladder pain syndrome (interstitial cystitis)
- Painful periods, see Period pain
- Palpitations, see Heart palpitations
- Pancreatic cancer
- Pancreatitis (acute), see Acute pancreatitis
- Pancreatitis (chronic), see Chronic pancreatitis
- Panic disorder
- Paracetamol
- Paralysis
- Parkinson's disease
- Patau's syndrome
- Peak flow test
- Pelvic inflammatory disease
- Pelvic organ prolapse
- Pelvic pain
- Pemphigus vulgaris
- Penile cancer
- Penis lumps and spots
- Perforated eardrum
- Pericarditis
- Perimenopause, see Menopause
- Period pain
- Periods
- Periods (heavy), see Heavy periods
- Periods (irregular), see Irregular periods
- Periods (missed or late), see Missed or late periods
- Peripheral arterial disease (PAD)
- Peripheral neuropathy
- Peritonitis
- Persistent trophoblastic disease and choriocarcinoma
- Personality disorders
- PET scan
- Peyronie's disease
- Phaeochromocytoma
- Phenylketonuria
- Phimosis, see Tight foreskin (phimosis)
- Phlebitis (superficial thrombophlebitis)
- Phobias
- Phosphate test
- Photodynamic therapy (PDT)
- Physiotherapy
- Piles (haemorrhoids)
- Pilonidal sinus
- Pins and needles
- PIP breast implants
- Pityriasis rosea
- Pityriasis versicolor
- Plagiocephaly and brachycephaly (flat head syndrome)
- Plantar fasciitis
- Plastic surgery
- Pleurisy
- PMS (premenstrual syndrome)
- Pneumococcal vaccine
- Pneumonia
- Poisoning
- Polio
- Polycystic kidney disease (autosomal dominant), see Autosomal dominant polycystic kidney disease
- Polycystic kidney disease (autosomal recessive), see Autosomal recessive polycystic kidney disease
- Polycystic ovary syndrome
- Polyhydramnios (too much amniotic fluid)
- Polymorphic light eruption
- Polymyalgia rheumatica
- Pompholyx (dyshidrotic eczema)
- Popliteal cyst, see Baker's cyst
- Post-herpetic neuralgia
- Post-mortem
- Post-polio syndrome
- Post-traumatic stress disorder (PTSD)
- Postmenopausal bleeding
- Postnatal depression
- Postpartum psychosis
- Postural tachycardia syndrome (PoTS)
- Potassium test
- Prader-Willi syndrome
- Pre-eclampsia
- Predictive genetic tests for cancer risk genes
- Pregnancy
- Premature ejaculation, see Ejaculation problems
- Pressure ulcers (pressure sores)
- Priapism (painful erections)
- Prickly heat, see Heat rash (prickly heat)
- Primary biliary cholangitis (primary biliary cirrhosis)
- Probiotics
- Problems swallowing pills
- Proctalgia, see Anal pain
- Progestogen-only pill
- Progressive supranuclear palsy
- Prolapse (pelvic organ), see Pelvic organ prolapse
- Prosopagnosia (face blindness)
- Prostate cancer
- Prostate enlargement, see Benign prostate enlargement
- Prostate problems
- Prostatitis
- PSA test
- Psoriasis
- Psoriatic arthritis
- Psychiatry
- Psychosis
- Psychotic depression
- Puberty (early or delayed), see Early or delayed puberty
- Pubic lice
- Pudendal neuralgia
- Pulmonary embolism
- Pulmonary fibrosis, see Idiopathic pulmonary fibrosis
- Pulmonary hypertension
- Pyoderma gangrenosum
- Rabies
- Radiotherapy
- Rashes in babies and children
- Raynaud's
- Reactive arthritis
- Rectal bleeding, see Bleeding from the bottom (rectal bleeding)
- Rectal cancer, see Bowel cancer
- Rectal examination
- Red blood cell count
- Red eye
- Reflux in babies
- Renal cancer, see Kidney cancer
- Repetitive strain injury (RSI)
- Respiratory syncytial virus (RSV)
- Respiratory syncytial virus (RSV) vaccine, see RSV vaccine
- Respiratory tract infections (RTIs)
- Restless legs syndrome
- Restricted growth (dwarfism)
- Retinal detachment, see Detached retina (retinal detachment)
- Retinal migraine
- Retinoblastoma
- Rett syndrome
- Reye's syndrome
- Rhesus disease
- Rheumatic fever
- Rheumatoid arthritis
- Rhinitis (allergic), see Allergic rhinitis
- Rickets and osteomalacia
- Ringworm
- Root canal treatment
- Rosacea
- Roseola
- Rotavirus vaccine
- Roundworm, see Worms in humans
- RSV vaccine
- RSV, see Respiratory syncytial virus (RSV)
- Rubella (german measles)
- Salivary gland stones
- Sarcoidosis
- Scabies
- Scarlet fever
- Scars
- Schistosomiasis (bilharzia)
- Schizophrenia
- Sciatica
- Scleroderma
- Scoliosis
- Scurvy
- Seasonal affective disorder (SAD)
- Seizures (children with fever), see Febrile seizures
- Seizures (fits), see What to do if someone has a seizure (fit)
- Selective mutism
- Self-harm
- Sense of smell (lost/changed), see Lost or changed sense of smell
- Sepsis
- Septic arthritis
- Septicaemia, see Sepsis
- Sexually transmitted infections (STIs)
- Shaking, see Tremor or shaking hands
- Shin pain (shin splints), see Shin splints
- Shin splints
- Shingles
- Shingles vaccine
- Short-sightedness (myopia)
- Shortness of breath
- Shoulder impingement
- Shoulder pain
- Sick building syndrome
- Sickle cell disease
- Silicosis
- Sinus cancer, see Nasal and sinus cancer
- Sinusitis (sinus infection)
- Sinusitis, see Sinusitis (sinus infection)
- Sjögren's syndrome
- Skin abscess
- Skin cancer (melanoma), see Melanoma skin cancer
- Skin cyst
- Skin picking disorder
- Skin tags
- Slapped cheek syndrome
- Sleep apnoea
- Sleep paralysis
- Sleepwalking
- Slipped disc
- Smelly feet
- Smelly urine
- Smoking (treatments to stop), see Stop smoking treatments
- Snake bites
- Snoring
- Social anxiety (social phobia)
- Soft tissue sarcoma
- Soiling (child pooing their pants)
- Solar keratoses, see Actinic keratoses (solar keratoses)
- Sore lips, see Sore or dry lips
- Sore or dry lips
- Sore or white tongue
- Sore throat
- Sperm count (low), see Low sperm count
- Spina bifida
- Spinal muscular atrophy (SMA)
- Spirometry
- Spleen problems and spleen removal
- Spondylolisthesis
- Sprains and strains
- Squint
- Stammering
- Staph infection
- Statins
- Stem cell and bone marrow transplants
- Stent insertion, see Coronary angioplasty and stent insertion
- Sterilisation (female), see Female sterilisation
- Sterlisation (male), see Vasectomy
- Steroid cream, see Topical corticosteroids
- Steroid inhalers
- Steroid injections
- Steroid misuse, see Anabolic steroid misuse
- Steroid nasal sprays
- Steroid tablets
- Steroids
- Stevens-Johnson syndrome
- Stillbirth
- Sting or bite (insect), see Insect bites and stings
- Stomach ache
- Stomach bug, see Diarrhoea and vomiting
- Stomach cancer
- Stomach ulcer
- Stop smoking treatments
- Strep A
- Stretch marks
- Stroke
- Stuttering, see Stammering
- Stye
- Subarachnoid haemorrhage
- Subdural haematoma
- Sudden confusion (delirium)
- Sudden infant death syndrome (SIDS)
- Sunburn
- Superficial thrombophlebitis, see Phlebitis (superficial thrombophlebitis)
- Supraventricular tachycardia (SVT)
- Surgery (having an operation), see Having an operation (surgery)
- Swallowing pills, see Problems swallowing pills
- Swallowing problems, see Dysphagia (swallowing problems)
- Sweat rash, see Heat rash (prickly heat)
- Sweating (excessive), see Excessive sweating (hyperhidrosis)
- Sweating (excessive), see Heat rash (prickly heat)
- Sweating at night, see Night sweats
- Swollen ankles, feet and legs (oedema)
- Swollen arms and hands (oedema)
- Swollen glands
- Syphilis
- Tailbone (coccyx) pain
- Tapeworm, see Worms in humans
- Tay-Sachs disease
- TB, see Tuberculosis (TB)
- Td/IPV vaccine (3-in-1 teenage booster)
- Teeth grinding (bruxism)
- Teeth whitening
- Temporal arteritis
- Temporomandibular disorder (TMD)
- Tendonitis
- Tennis elbow
- TENS (transcutaneous electrical nerve stimulation)
- Tension headaches
- Testicle lumps and swellings
- Testicle pain
- Testicular cancer
- Tetanus
- Thalassaemia
- The 'male menopause'
- Thirst (excessive), see Excessive thirst
- Thoracic outlet syndrome
- Threadworms
- Throat (sore), see Sore throat
- Thrombophilia
- Thrush in men and women
- Thumb pain
- Thyroid cancer
- TIA, see Transient ischaemic attack (TIA)
- Tick-borne encephalitis (TBE)
- Tics
- Tight foreskin (phimosis)
- Tinnitus
- Tiredness and fatigue
- Toe pain
- Tongue (sore or white), see Sore or white tongue
- Tongue-tie
- Tonsillitis
- Tooth (chipped or broken), see Chipped, broken or cracked tooth
- Tooth decay
- Tooth knocked out, see Knocked-out tooth
- Toothache
- Topical corticosteroids
- Total iron-binding capacity (TIBC) and transferrin test
- Total protein test
- Tourette's syndrome
- Toxic shock syndrome
- Toxocariasis
- Toxoplasmosis
- Tracheostomy
- Transient ischaemic attack (TIA)
- Transurethral resection of the prostate (TURP)
- Travel vaccinations
- Tremor or shaking hands
- Tremor, see Tremor or shaking hands
- Trichomoniasis
- Trichotillomania (hair pulling disorder)
- Trigeminal neuralgia
- Trigger finger
- Trimethylaminuria ('fish odour syndrome')
- Tuberculosis (TB)
- Tuberous sclerosis
- Tummy ache, see Stomach ache
- Tummy bug, see Diarrhoea and vomiting
- Turner syndrome
- Twitching eyes and muscles
- Type 1 diabetes
- Type 2 diabetes
- Typhoid fever
- Typhus
- Ulcerative colitis
- Ultrasound scan
- Umbilical hernia repair
- Underactive thyroid (hypothyroidism)
- Undescended testicles
- Unintentional weight loss
- Upper back pain, see Back pain
- Urethritis
- Urinary catheter
- Urinary incontinence
- Urinary tract infections (UTIs)
- Urine (smelly), see Smelly urine
- Urine albumin to creatinine ratio (ACR)
- Uterine (womb) cancer, see Womb (uterus) cancer
- Uveitis
- Vaginal bleeding between periods or after sex
- Vaginal cancer
- Vaginal discharge
- Vaginal dryness
- Vaginal pain, see Vulvodynia (vulval pain)
- Vaginal ring
- Vaginismus
- Vaginitis
- Varicose eczema
- Varicose veins
- Vascular dementia
- Vasculitis
- Vasectomy
- Venous leg ulcer
- Vertigo
- Vestibular neuritis, see Labyrinthitis and vestibular neuritis
- Vestibular schwannoma, see Acoustic neuroma (vestibular schwannoma)
- Vitamin B12 or folate deficiency anaemia
- Vitamins and minerals
- Vitiligo
- Vomiting blood
- Vomiting bug, see Norovirus (vomiting bug)
- Vomiting, see Diarrhoea and vomiting
- Von Willebrand disease
- Vulval cancer
- Vulvodynia (vulval pain)
- Warts and verrucas
- Watering eyes
- Weight loss (unexpected), see Unintentional weight loss
- Weight loss (unintentional), see Unintentional weight loss
- Weight loss surgery
- Weil's disease, see Leptospirosis (Weil's disease)
- What to do if someone has a seizure (fit)
- Whiplash
- White blood cell count (low), see Low white blood cell count
- Whitlow finger, see Herpetic whitlow (whitlow finger)
- Whooping cough
- Wind, see Farting (flatulence)
- Winter vomiting bug, see Norovirus (vomiting bug)
- Wisdom tooth removal
- Wolff-Parkinson-White syndrome
- Womb (uterus) cancer
- Women's health
- Worms in humans
- Wrist pain