Ovulation is the process of expelling an egg cell together with some cells around it. Some women experience some normal physiological phenomena during ovulation (calculated as 14 days before the next menstrual period). The common symptoms are: bleeding during ovulation, sometimes accompanied by discomfort or vague pain in one side of the lower abdomen, individual women may have stronger abdominal pain, these symptoms occur with different frequency, frequent ones may occur for several months in a row, some may occur for several months in a year, some may occur only a few times in a lifetime. The mucus secreted by the cervical glandular cells also changes significantly periodically with the ovarian cycle. By the time ovulation occurs, cervical mucus secretion is increasing, and the mucus is thin, clear, and stretched up to 10 cm or more. At this time, women will feel an increase in the amount of colorless and odorless leucorrhea and moist vulva. In addition, after ovulation, the progesterone produced by the corpus luteum of the ovary acts on the hypothalamus thermoregulatory center, causing the body temperature to rise by 0.3-0.5 degrees, which lasts until 1-2 days before the next menstruation or the first day of menstruation, when the body temperature drops to the original level again, and the time of temperature increase should last 12-14 days. These symptoms are normal physiological phenomena and generally do not affect women’s health. Many women do not have special symptoms during ovulation, and careful observation of the leukorrhea and basal body temperature changes can help identify ovulation.