There are many reasons for nausea and vomiting during ovulation, which may be related to the act of ovulation itself, or may be the effect of other factors during the period, such as changes in hormone levels, follicle rupture, side effects of birth control pills, digestive tract diseases, etc.: I. Ovulation factors 1. 2. Follicle rupture: If follicle rupture occurs during ovulation, follicular fluid may enter the pelvic cavity after ovulation, and pelvic bleeding may occur, which in turn may stimulate the gastrointestinal tract and cause symptoms of nausea and vomiting. If the drug coincides with ovulation, the side effects of the drug may cause nausea and vomiting during ovulation, which can be relieved within a short period of time with the metabolism of the drug; 2. Gastrointestinal diseases: If the patient has an unclean diet, or if there is inflammation of the gastrointestinal tract, ulcers, liver and gallbladder diseases, nausea and vomiting may also occur. 3. Reproductive system diseases: If the patient suffers from inflammatory diseases such as tubitis and endometritis, which cause congestion or other stimulation of the pelvic tissues during ovulation, the contraction of the fallopian tubes and uterus can be induced, and some patients can experience nausea and vomiting.