If a woman’s period is not more than seven days early, it is within the normal fluctuation range and is not a disease, so there is no need to be nervous or to do special treatment. If a woman’s period is more than seven days early, it is considered to be early. If a woman’s menstruation appears early once in a while, which was normal before, there is no need to be especially nervous or to make a disease theory, because women’s menstruation is under the control of the cerebral cortex and is affected by various factors such as women’s emotions, environmental changes, mood, work and mental stress, and even changes in sleeping habits can affect menstruation and cause occasional abnormal menstruation. If a woman’s menstruation often appears early and her menstrual cycle is less than 21 days, she is premenstruating. Most of the diseases of early menstruation are caused by insufficient luteal function of the ovaries and need to be treated with progesterone supplementation. The normal menstrual cycle for women is in the range of 22-35 days, which are normal menstruation.