Mange is also called niacin deficiency, niacin is also known as vitamin B3, mainly seen in dietary imbalance (such as chronic alcoholism), gastrointestinal diseases and severe seminal stretching disorders, a small number of carcinoid tumors and Hartnup's disease, the long-term application of isoniazid, 6-mercaptopurine and 5-fluorouracil can also cause this disease. Niacin deficiency (mange) is mainly characterized by dermatitis, diarrhea and mental symptoms. The treatment of niacin deficiency is mainly oral niacinamide, or intramuscular injection in severe cases. It is important to eat a balanced diet and avoid alcohol. Active treatment of primary diseases, exclude the effects of drugs.

Nicotinic acid deficiency is caused by niacin and tryptophan at the same time the lack of damage to the metabolism of poultry substances, the deficiency is mainly manifested in mange symptoms, niacin is also known as anti-mange vitamins. Patients in the early performance is not obvious, often have a loss of appetite, tiredness, fatigue, weight loss, abdominal pain and discomfort, dyspepsia, easy to get excited, poor concentration, insomnia and other non-specific symptoms.