Youth hair loss is mostly related to genetic factors, poor nutrition, late sleep, stressful study, irregular diet, or too greasy, spicy, etc. Nowadays, the phenomenon of youth hair loss is becoming more and more obvious and must be taken seriously. The genetic factor is mainly that there are hair loss patients in the family, and the survey shows that the incidence rate of those with hair loss in the family is significantly higher than those without family history of the disease. Due to the high academic pressure of adolescents, it leads to the disorder of plant nerves or central nervous system, which makes the hair follicles, hair papillae change greatly and inhibits the hair growth function, thus causing hair loss. In addition, due to the high concentration of adolescents, the long time of using the brain, the brain is in a long-term state of excitement, the endocrine function related to hair growth is disrupted, the scalp follicles are blocked, so that the hair absorption of nutrients is blocked, resulting in hair loss. There is also male androgenetic alopecia, which usually begins to appear after puberty and manifests itself as itchy scalp, hair reduction, greasy scalp, acne and other related. In addition, bad dietary habits can also cause hair loss in teenagers, such as insufficient protein and vitamins. To prevent teenage hair loss, first of all, we should develop good living habits, go to bed early, wake up early, reduce staying up late, and keep a happy mood. We should also eat more food rich in protein and vitamins, and avoid spicy and greasy food.