Body hair growth in girls can be caused by physiologic factors such as puberty, or by disease factors such as polycystic ovary syndrome or Cushing’s syndrome. Physiological factors suggest that height may increase rapidly, while disease factors generally do not result in rapid height growth. 1. Physiological factors: girls entering puberty due to changes in the levels of various hormones in the body resulting in long body hair, while puberty will greatly accelerate the rate of female growth and development, reaching the second growth spurt, there may be a sudden increase in height at this time. 2. Disease factors: polycystic ovary syndrome is due to increased secretion of androgens in the body, and Cushing’s syndrome is due to excessive secretion of glucocorticoids in the body, all of the above diseases may cause long body hair or body hair becomes exuberant. Disease-induced growth of body hair does not enter the height-growth period. It is recommended to go to the hospital after eliminating the physiological causes of body hair growth.