维生素是人体不可缺少的六大营养素之一,对人体至关重要。有些人由于缺乏医学知识,将它作为滋补药品长期服用。维生素不是可随便吃的“营养药”,如果长期大量使用,会引起不良反应,甚至中毒。因此,服用维生素,必须遵照医生嘱咐。维生素 A 缺乏时能引起夜盲症或干眼症。如过量服用维生素 A 会引起急性中毒,主要表现为头疼、烦躁、恶心呕吐、腹泻、嗜睡,婴儿还有前囟隆起等症状。长期服用维生素 A 可致慢性中毒,主要表现出四肢疼痛、食欲不振、体重减轻、头发干枯脱落、眼球震 Vitamin is one of the six essential nutrients of the human body, essential to the human body. Some people, due to a lack of medical knowledge, use it as a tonic for long-term use. Vitamins are not free to eat “nutritional medicine”, if used in large quantities for a long time, can cause adverse reactions, or even poisoning. Therefore, taking vitamins, you must follow the doctor’s advice. Lack of vitamin A can cause night blindness or dry eye syndrome. Such as overdose of vitamin A can cause acute poisoning, mainly for the headache, irritability, nausea and vomiting, diarrhea, drowsiness, infants and other anterior fontanel bulge and other symptoms. Long-term use of vitamin A can cause chronic poisoning, mainly manifested limb pain, loss of appetite, weight loss, dry hair loss, nystagmus