No menstrual pain is normal. Normally, during menstruation, most women will only experience a slight soreness and swelling in the lower abdomen and will not experience significant pain. If there is more obvious pain in the small abdomen, it belongs to dysmenorrhea, which is a pathological phenomenon. The main causes of dysmenorrhea are not keeping the abdomen warm during menstruation, resulting in cold in the abdomen and body, leading to stagnation of menstrual blood, poor circulation of menstrual blood and dysmenorrhea. If a woman keeps warm during menstruation, and her endocrine secretion is normal, and there is no pelvic inflammatory disease, endometritis or adnexitis, the menstrual blood circulates smoothly during menstruation, and generally does not produce dysmenorrhea. It is recommended that women pay attention to keeping warm during menstruation, avoid cold, and avoid spicy, stimulating and cold foods in their diet.