Normal menstruation does not necessarily mean that the hormone levels in the body are normal, as some hormonal changes do not directly affect menstruation. Normal menstruation includes normal menstrual cycle, menstrual period, menstrual volume and color, and no other special symptoms. Normal menstrual cycle is 21-35 days, menstrual period is 2-8 days, the volume of menstruation is 20-60ml, the color of menstruation is dark red, and there are no symptoms such as severe abdominal pain. Whether menstruation is normal or not is closely related to the changes in the levels of estrogen and progesterone in the body, both of which ensure normal menstruation. However, there are many other hormones in the body besides sex hormones, such as thyroid hormones, adrenal hormones, growth hormones, etc. Too much or too little of these hormones will not affect menstruation. Therefore, normal menstruation does not mean that the hormone levels in the body must be normal. When your body has any discomfort other than menstruation, you should go to the hospital for checkups in time to avoid delaying your condition.