The situation that the patient’s hair falls out when he pulls it may belong to normal physiological phenomenon, or it may be caused by excessive perming and dyeing, ringworm and other reasons. 1. Physiological phenomenon: when part of the patient’s hair is in the resting period, there may be a situation where the hair falls out when it is pulled, if the hair loss time does not last for a long time, and the amount of hair loss is not much, it is a normal physiological phenomenon, so there is no need to worry too much about it, and it is enough to pay attention to observation. 2. Excessive perming and dyeing: As perming and dyeing ointment contains irritating ingredients, frequent perming and dyeing will stimulate the hair follicles as well as the hair, resulting in sensitive hair follicles and fragile hair, which will lead to hair falling out as soon as the hair is pulled. 3. Tinea capitis: Tinea capitis is a contagious disease caused by dermatophyte infection of the scalp and hair, mainly manifested as scalp itching, hair loss, scaly lesions and other symptoms, hair a pull on the fall may be caused by tinea capitis. In addition, mental stress, seborrheic dermatitis, hyperthyroidism and other reasons may also cause such a situation, it is recommended that the patient timely medical examination, to clarify the cause of the targeted treatment.