Lower abdominal pain during ovulation is commonly caused by the following reasons: 1) chronic inflammation of the pelvic cavity, which can aggravate the congestion and edema of the chronic inflammation when having sex, so there is pain. 2) relatively rough movements when having sex, which can stimulate the uterus to contract and lead to lower abdominal pain. 3) endometriosis, which can reduce the elasticity of pelvic tissues, and stimulation can also lead to lower abdominal pain. 4) tumors can also lead to lower abdominal pain. 5) the pain can be caused by the stimulation of the uterus. Stimulation can also lead to pain in the lower abdomen. 4, pelvic tumors can also cause pain in the lower abdomen during coitus. The reason for the pain in the lower abdomen is that the majority of the pain in the lower abdomen during intercourse has nothing to do with the ovulation itself.