Physiological period, often referred to as the female physiological period, is generally in the normal range of 21 to 35 days between intervals, and the duration of each menstrual period is usually 2-8 days, with an average of 4 to 6 days. Normal menstruation is cyclical. The first day of bleeding is the beginning of the menstrual cycle, and the interval between the first day of two menstrual periods is called a menstrual cycle. It usually lasts from 21 to 35 days, with an average of 28 days. The duration of each menstrual period is called the menstrual period, usually 2-8 days, average 4-6 days. The amount of menstrual flow is the total amount of blood lost during a menstrual period. The normal amount of menstrual flow is 20-60 ml, and more than 80 ml is considered as excessive menstrual flow. Generally, there are no special symptoms during menstruation, but dysmenorrhea may occur during menstruation due to the secretion of prostaglandins by the endometrium, etc. Common symptoms include pain in the lower abdomen, lower abdominal and lumbosacral area, and in severe cases, the pain may spread to the lumbosacral area, back and even thighs and feet. Besides pain, dysmenorrhea can also cause systemic symptoms such as nausea and dizziness. If you have heavy and prolonged menstrual periods or severe menstrual cramps, you must consult a doctor in time, and may need to do gynecological examination, gynecological ultrasound and other tests, and hysteroscopy plus segmental diagnostic scraping, if necessary, to assist in diagnosis and treatment.