The causes of Lesser Whitehead are more complicated and not necessarily caused by poor kidneys. The causes of alopecia areata include genetic factors, acquired factors, mental factors, malnutrition and so on. 1. Hereditary factors: if someone in the family has alopecia areata, the chance of hereditary alopecia areata is higher. 2. Acquired disease factors: such as vitiligo, tuberculosis, tumors, pernicious anemia, pituitary gland function decline, hyperthyroidism and other endocrine diseases, plant nerve dysfunction can lead to less white head. 3. mental factors: such as emotional tension, anxiety and fear, too depressed and other factors can lead to less white head. 4. Nutritional deficiencies: lack of protein, trace elements, vitamins and other anti-free radical substances can lead to less whiteheads. It is not necessarily caused by bad kidneys. It is recommended to keep away from bad triggers, avoid smoking and staying up late, and exercise regularly. The symptoms of discomfort actively consult a doctor to identify the cause, and then standardized treatment.