Right abdominal pain during menstruation is considered to be related to physiological factors, endometriosis, pelvic inflammatory disease and so on. 1. Physiological factors: During menstruation, the prostaglandin level in women’s bodies rises, pelvic congestion is obvious, so the patient will have hidden pain in the lower abdomen and other discomforts. 2. Endometriosis: for patients with endometriosis such as chocolate cyst on the right ovary, as the ectopic endometrium will bleed with the change of estrogen and progesterone, so the patients will have cyclic pain in the lower abdomen, which will be aggravated progressively. 3. Pelvic inflammatory disease: For patients with pelvic inflammatory disease, due to the combination of local tissues with congestion, redness and swelling and other inflammatory manifestations, so the patient will appear in the lower abdomen pain and discomfort, and some patients are accompanied by fever, fatigue and other discomforts. For patients with right abdominal pain during menstruation, it is recommended that they go to the gynecology department of a regular hospital after menstruation is cleared, complete ultrasound and other relevant examinations, and then actively treat the cause under the guidance of the doctor.