There are many types of vitamins such as Vitamin A, B vitamins, Vitamin C, Vitamin D, and so on. Deficiencies of different vitamins show different hazards. Such as night blindness, dry eye, osteoporosis, etc.. 1. Vitamin A deficiency: it may adversely affect the eye function, and night blindness and dry eye will often occur. At the same time, the skin will also show dryness, local itching, pigmentation and other problems. It is recommended to follow the doctor’s advice to supplement vitamin A in time to relieve the skin and eye symptoms. 2. Lack of B vitamins: B vitamins include many kinds of vitamins, the lack of different kinds of harm is also different, for example, lack of vitamin B ₂ easy to have keratitis, dry and cracked lips, inflammation of the tongue and other symptoms. For this situation, B vitamins should be supplemented in time under the guidance of the doctor. 3. Lack of vitamin C: it will cause a decline in immunity, as well as oral diseases such as periodontitis, bleeding gums, and even cause sepsis in severe cases. You can eat more fruits and take vitamin C as prescribed by your doctor. 4. lack of vitamin D: often appear cramps, osteoporosis problems, if the lack of vitamin D phenomenon is more serious, but also lead to rickets. After medical diagnosis, vitamin D deficiency can be appropriate sun exposure, and follow the doctor’s instructions to take vitamin D preparations. Lack of vitamin has a great impact on health, but the need to go to a regular hospital, follow the doctor’s instructions to take medication, not unauthorized use of medication, daily life should be balanced nutrition, eat more vegetables and fruits, nuts and other vitamin-rich foods.