Fast beard growth may be caused by physiological factors such as heredity, frequent shaving, or disease factors such as polycystic ovary syndrome, it is recommended to consult a doctor. 1. Physiological factors: some people’s fast beard growth is caused by genetic factors; frequent shaving will lead to stimulation at the hair follicles, resulting in rapid beard growth. 2. Disease factors: patients with polycystic ovary syndrome androgen secretion in the body will lead to fast beard growth; Cushing’s syndrome patients with increased glucocorticoid hormone will lead to facial hair, which will cause the beard to grow fast. It is recommended to go to the hospital and ask the doctor to make a judgment after eliminating physiological factors when the beard grows fast.