If your stomach hurts when you ovulate, it indicates that you have already ovulated, and the stomach pain may occur only after ovulation. Tummy pain is often caused by the following reasons: 1. The phenomenon of increased pressure in the corpus luteum after ovulation is often due to a small amount of bleeding in the corpus luteum, which causes increased pressure and therefore leads to pain in the lower abdomen. The pain is more obvious because of individual differences, some people are relatively sensitive, the vast majority of pain can be ignored. 2, the pelvis had chronic inflammation, ovulation when the follicular fluid flow to the rectal trap of the uterus, the original chronic inflammation of the pelvis leads to pelvic tissue congestion, the stimulation of follicular fluid will cause pain in the lower abdomen.