The term “physiological period” generally refers to a woman’s menstruation. There are many reasons for abdominal pain during menstruation, including dysmenorrhea, pelvic inflammatory disease, and intestinal diseases. 1. Dysmenorrhea: excessive synthesis of local prostaglandins during menstruation may stimulate excessive contraction of the uterine muscles, resulting in ischemia of the uterus, which increases the body’s sensitivity and causes pain in the abdomen when going to the bathroom. 2. Pelvic inflammatory disease: If you suffer from pelvic inflammatory disease, under the stimulation of inflammation, it can lead to the symptom of abdominal pain when going to the toilet, often accompanied by abnormal secretion. 3. Intestinal diseases: such as ulcerative colitis, appendicitis, irritable bowel syndrome and other diseases, may also cause a woman to go to the toilet a hard abdominal pain. Menstruation female toilet a hard abdominal pain may also have other reasons, it is recommended that timely medical care, improve the relevant examination, under the guidance of specialists actively diagnosis and treatment.