There are many reasons for hair loss, if a small amount of hair loss in daily life is normal and does not require excessive treatment. If the number of hair loss is more or even patchy hair loss, it belongs to pathological hair loss, you need to go to the hospital in time to identify the cause, the corresponding treatment for the situation: a. Common causes 1, external stimulation: mechanical stimulation such as long-term high ponytail or often perm, exposure to radioactive substances or chemical substances such as hair dye, etc., will lead to damage to the scalp hair follicles, and then there will be hair loss. Symptoms. Patients taking drugs such as atenolol, phenytoin sodium, hydrocortisone, and patients receiving chemotherapy and radiotherapy may experience hair loss due to side effects; 2, mental factors: patients with high mental stress may experience disorders of the nervous system, inhibiting hair growth and hair loss; 3, disease factors: systemic anemia, malnutrition, fungal infectious diseases of the scalp, scalp trauma, and chronic lymphocytic thyroid disease. As well as chronic lymphocytic thyroiditis, lupus erythematosus, baldness and other autoimmune diseases may also show symptoms of hair loss. Endocrine disorders can also cause hair loss; 4, genetic factors: congenital factors caused by the complete absence or thinning of hair, some patients are born with thinning hair, some patients are born with normal hair, and then slowly shed without regeneration. Second, related treatment 1, reduce stimulation: it is recommended to minimize the number of perms, hair dyeing, change the habit of tying a high ponytail, wear protective cap in the air pollution serious environment, so as to reduce the stimulation of hair follicles and relieve the symptoms of hair loss. Patients who need to receive long-term drug treatment can go to the hospital to determine whether they need to reduce the amount of medication or combined treatment with other drugs under the advice of the doctor; seasonal hair loss need not worry too much, it will improve with the passing of the season; 2. Treatment of the original disease: hair loss caused by disease, first of all, go to the hospital to treat the original disease, after the treatment of the original disease, the symptoms of hair loss will also improve; 3. Patients with severe hair loss should seek medical attention in a timely manner, and under the advice of the doctor take oral finasteride and other drugs with the external rubbing of minoxidil tincture to improve the symptoms of hair loss; 4, hair transplant treatment: patients with more serious hair loss and no relief from drug treatment can consider going to the hospital for hair transplant treatment.