Adolescent girls waist hair is a normal phenomenon. Puberty girls, the body hormone level gradually rise, androgen will also be secreted exuberantly, there will be an increase in the phenomenon of body hair, waist hair is also a normal phenomenon, if the body hair is not particularly dense, there is no uncomfortable physical symptoms, usually do not need to be treated. Under normal circumstances, after the girl reaches puberty, the body’s physiological functions gradually develop and perfect, the endocrine mechanism is gradually perfect, the psychological changes with the passage of time gradually develop and mature, with the body’s hormone level changes, sex hormone secretion gradually increased, the human body’s secondary sexual characteristics gradually develop, the girl will also appear to have increased body hair, such as armpit hair, pubic hair, and so on. It is recommended that patients maintain a comfortable mood during puberty, pay attention to protect the body and avoid trauma. If there is no other discomfort, rest is usually sufficient.