Hair loss may be related to physiological factors, abnormal thyroid function, androgenetic alopecia and other factors. 1. Physiological factors: if the recent long-term excessive late-night, or psychological stress, mental mood is not good, long time in excessive anxiety, nervousness, are prone to cause hair loss phenomenon, which may appear hair a grab a big drop. 2. Abnormal thyroid function: such as hypothyroidism, hyperthyroidism, etc., because the patient’s thyroid function is abnormal, resulting in too much or too little secretion of thyroid hormones, may cause hair loss, which may be accompanied by irritability, hyperphagia, chills, fatigue, muscle pain and other symptoms. 3. Androgenetic alopecia: usually due to genetic factors, excessive secretion of androgens and other reasons, which can lead to severe hair loss phenomenon, resulting in hair loss, especially in the case of mental stress, lack of sleep and other circumstances will aggravate the phenomenon of hair loss. Hair loss can also be caused by other reasons, so it is recommended to consult a doctor as soon as possible to diagnose the cause of the disease and then give targeted treatment and conditioning.