Hair loss at the back of the head may be caused by physiological factors such as tension and anxiety or hair being pulled for a long period of time, or it may be caused by baldness or ringworm. 1. Physiological factors: If the body feels tense and anxious for a long time, or use too tight leather band when tying the hair, combing the hair too hard, it may lead to hair loss at the back of the head. This is a normal physiological factor, which will usually improve after relaxing your mood or braiding your hair with a loose leather band. 2. Patchy baldness: The cause of patchy baldness is still unclear, and it is considered to be related to heredity, autoimmune abnormalities and other factors. Patients will have sudden patchy hair loss, and the hair at the edge of the hair loss will be loose and easy to pull out. If baldness occurs at the back of the head, the symptoms of hair loss at the back of the head will occur. 3. Ringworm of the head: ringworm of the head is caused by small sporotrichum genus, trichophyton genus, epidermolysis bullosa infection. Patients will have hair loss with scaling, broken hair, yellow scabs, itching and other manifestations. If a patient develops tinea capitis in the back of the head, he or she may experience hair loss in the back of the head. Hair loss at the back of the head may also be caused with seborrheic alopecia, scalp trauma, hair pulling fetish, folliculitis and other reasons. It is recommended that patients go to the hospital in a timely manner, after clarifying the cause of the disease, and choose targeted measures for treatment under the guidance of the doctor.