Common vitamin B deficiency symptoms are as follows: 1, vitamin B1 deficiency: can make the nerve, tissue energy supply is insufficient, leading to foot disease, the patient manifests as easy fatigue, irritability, memory loss, abnormal sensation of the feet, indigestion, gastrointestinal distention, patients with heart involvement will have breathing difficulties, can not lie down, sitting breathing. 2, vitamin B2 deficiency: can cause keratitis, corneal 3.Vitamin B6 deficiency: it can cause peripheral nerve damage, causing hyperalgesia, excitement, convulsions, nausea, vomiting, diarrhea, etc. 4.Vitamin B12 deficiency: it can cause anemia, and the patient will show dizziness, numbness of hands and feet, weakness of the body, and mental discomfort. and other symptoms.