After a woman’s menstruation, the period lasts for 3-7 days or less, and a period of less than 3 days is considered too short, while a period of more than 7 days is considered too long. The main factor affecting the length of a woman’s menstrual period is the regularity of the ovary’s secretion of estrogen and progesterone. Factors affecting the ovary’s endocrine function: first, the endocrine function of the hypothalamus and pituitary gland; second, the daily dietary and living habits and the functional status of the ovary itself. Any factor that causes the regularity of ovarian secretion of estrogen and progesterone to be out of order will lead to changes in a woman’s menstrual period, cycle, and volume. In daily life, good dietary and living habits are the basis for maintaining normal endocrine function of the ovaries and normal menstrual periods, cycles and volume. Be careful not to stay up late, do not smoke or drink alcohol, avoid excessive dieting and overeating, keep your mood happy and avoid excessive stress.