Hair loss is a normal physiological phenomenon in the human body, and usually a person will lose about 50-100 hairs a day. Therefore, hair loss in a 14-year-old girl may be a normal physiological state, and there is no need to worry too much at this time. However, if the number of roots shed exceeds the above value, or a large number of concentrated shedding, you need to consider the problem of hair loss, common causes such as mental tension, lack of nutrition, improper care, germ infection, family genetics, etc. 1, mental tension: 14-year-old girls just enter puberty, learning pressure is relatively large, heavy psychological burden, some children may appear because of this hair loss situation. To let the child pay attention to rest, appropriate guidance emotions, avoid high tension, lift the burden of thought, work and rest, conducive to the alleviation of hair loss symptoms; 2, lack of nutrition: If the child lacks certain nutrients, such as calcium, protein, fat, as well as zinc, iron and other trace elements, vitamins, etc., may cause the body metabolic abnormalities, resulting in hair growth problems. Parents should usually give their children more nutritional elements, such as eggs, milk, lean pork, beef, peanuts, tofu, and also eat some fresh vegetables and fruits, such as celery, oranges, etc., to promote hair growth; 3, improper care: If children use improper shampoo products, or often dye or perm hair, it may cause damage to the hair follicles and hair loss. In life should pay attention to the care of the hair, such as frequent combing, it is recommended to use a neutral or weak acid shampoo that does not stimulate the scalp and hair, pay attention to the frequency of perming, hair dyeing, etc.; 4, germ infection: If the child has a fungal infection or allergies, etc., it can lead to dermatitis, and then infected hair loss. In this case, the infected germs should be treated by taking or applying drugs topically; 5, family genetics: some families are born with sparse hair, and if there are elders with hair loss in the child’s family, their hair loss may start to appear around the age of 14; 6, other: if the girl is taking anti-cancer drugs or receiving radiation treatment, there may be hair loss at the age of 14.