Causing serious hair loss in students is mostly due to ringworm of the head, baldness, hair pulling fetish and other reasons. 1. Tinea capitis: it is a skin disease in which the hair and scalp are infected by dermatophytes, which is mostly infectious and occurs in children. The most common symptom is single or multiple alopecia spots covered with grayish-white scales, which can cause permanent hair loss. 2. Patchy baldness: this disease is related to genetics, autoimmunity, endocrine and mental factors. It can occur at any age, mostly in young adults. The common clinical manifestation is the sudden appearance of patchy hair loss with clear boundaries, and the hair can usually be regenerated. 3. Hair pulling fetish: belonging to one of the psychiatric disorders, due to repeated pulling out their own hair, can cause localized severe hair loss. If students have serious hair loss, it is recommended that they consult a doctor in a timely manner to clarify the cause of the disease and treat the symptoms.