Little girl hair loss in general is a normal physiological phenomenon, but does not exclude baldness, seborrheic alopecia and other causes. 1. Normal physiological phenomenon: hair has a certain lifespan, with the growth of time, under normal circumstances, hair loss of 50 ~ 100 per day is a normal phenomenon, do not need to carry out special treatment. 2. Patch baldness: it is a mental factor-led, autoimmune-related non-scarring hair loss disease that can occur in any part of the body. It is characterized by the sudden appearance of round or oval, 1-10cm in diameter, varying number of hair loss areas with clear boundaries, smooth skin in the affected area, without inflammation, scales and scarring. 3. Seborrheic alopecia: most cases are related to heredity, androgen is one of the important mechanisms for the development of this disease. It can also cause hair loss in little girls. Because of the causes of hair loss in little girls, it is recommended to go to the hospital in time for examination and confirmation, and give targeted treatment after the cause of the disease is clear.