Discharge is usually present before menstruation and is heavy. Female secretions are made up of exudate from the vaginal wall, endometrial glands and cervical canal secretions, which increase or decrease under the influence of hormones as the menstrual cycle progresses. Before menstruation, the estrogen level in a woman’s body is relatively high, the endometrial glands and cervical canal secretion will increase, and the pelvic cavity is in a state of congestion before menstruation, which will increase the exudate of the vaginal wall, so there will be an increase in secretion. After menstruation, the secretion will gradually decrease and then increase again during ovulation due to the rise in estrogen levels. It is normal for discharge to increase before menstruation, and women are advised to pay attention to personal hygiene and change their underwear regularly.