seborrheic alopecia is also called premature alopecia, male alopecia, male alopecia, diffuse alopecia or common alopecia. This kind of hair loss is related to heredity, androgen and sebum overflow. Its main symptom is that the patient's scalp fat overflows excessively, resulting in greasy and moist scalp, accompanied by dust and dander. If you don't wash your hair for a few days, your hair will become dirty and give off an unpleasant smell. Sometimes there are symptoms of scalp itching and seborrheic dermatitis.

Seborrheic alopecia usually begins at the top of the head and on both sides of the forehead, and then gradually spreads to other parts. The number of hair that falls off every day exceeds the normal range (about 5 hairs), or the hair is obviously thinner than before, which is considered as pathological alopecia.

Seborrheic alopecia mainly affects young men, but in recent years, female patients have a rapid increase trend. Genetic susceptibility and abnormal androgen metabolism in scalp hair follicles are the main causes of this disease. In addition, long-term mental stress, eating disorder and mental state imbalance are also important causes of the disease.

The above contents are for reference only. For more information, it is recommended to consult relevant literature or consult a professional doctor.