均衡飲食通常不會出現維他命K缺乏症(英语:Vitamin K deficiency),健康的成年人很少會有原發性的缺乏症。新生嬰兒出現缺乏的風險增加。維他命K缺乏症患病率上升的人口中包括那些患有肝病的人,例如酗酒、囊腫性纖維化、炎症性腸病、或最近進行過腹部手術的人。繼發性維他命K缺乏症會發生於神經性暴食症患者、飲食嚴格的人,以及服用抗凝劑的人身上。其他與維他命K缺乏症有關的藥物包括水楊酸、巴比妥類藥物及頭孢孟多酯,儘管其作用機理尚未清楚。維他命K缺乏症已被定義為對維他命K具反應的低凝血酶原血症,會增加凝血酶原時間[4],因此可能導致出現一種出血性疾病—凝血病[2]。維他命K1缺乏症的症狀包括貧血、瘀斑、流鼻血及男女牙齦出血和女性月經大量出血。
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