VB is the general name of B vitamins, vitamin B mainly includes vitamin B1, vitamin B2, vitamin B3, vitamin B6, vitamin B12, etc. The lack of different vitamins may have different symptoms. 1, vitamin B1: it has a certain role in promoting appetite, maintaining normal nerve activity, etc. The lack of vitamin B1 may lead to physical fatigue and weakness, irritability and irritability, abnormal feet Burning sensation and other symptoms of beriberi. Daily life can be taken from milk, tomatoes, egg yolks and other foods; 2, vitamin B2: also known as riboflavin, vitamin B2 deficiency in the body will make the skin more sensitive to sunlight, easily lead to solar dermatitis, itchy skin, and even skin ulcers and other symptoms. In daily life, you can take from fish, vegetables and other foods; 3, vitamin B3: also known as niacin, has an effective inhibitory effect on the formation of skin melanin. Lack of vitamin B3 may lead to rough skin, may also lead to dermatitis and other symptoms, life can mainly be obtained from beans, lean meat, brown rice and other foods; 4, vitamin B6: with the promotion of development and other functions, lack of vitamin B6 may cause vomiting, cramps, emotional depression, mental confusion and other symptoms, mostly due to genetic factors, a normal balanced diet generally will not appear vitamin B6 deficiency, mainly can be taken from liver, lean meat and other foods; 5, vitamin B12: also known as cobalamin, mainly present in meat, can be synthesized by intestinal bacteria, when vitamin B12 deficiency may lead to loss of appetite, occasionally manifested as constipation and other digestive symptoms, as well as frequent fatigue and weakness, mental discomfort and other symptoms of liver dysfunction. Vitamin B12 is usually not deficient under normal diet, and people with long-term vegetarianism may be deficient in vitamin B. For specific vitamin deficiencies, you should consult a professional doctor and use medication under the guidance of the doctor after identifying the cause.