Stomach pain during menstruation is generally known as dysmenorrhea, including primary and secondary dysmenorrhea. Primary dysmenorrhea can be treated without any special treatment if the degree is mild, and if it is more painful, pain relievers such as ibuprofen can be used under the guidance of a doctor or pharmacist. Secondary dysmenorrhea need to actively treat related diseases, to avoid delayed health effects. First, primary dysmenorrhea: 1, excessive contraction of uterine muscles: female menstruation, the body’s prostaglandin synthesis and release increased, angiotensin, oxytocin content increases, stimulating excessive contraction of uterine muscles, so that women feel pain, is the main reason for primary dysmenorrhea; 2, uncoordinated contraction of the uterus: uterine excessive tilt and flexion, uterine dysplasia and other conditions will lead to poor circulation of menstrual blood, the uterus uncoordinated contraction cause Dysmenorrhea; 3, bad mood and diet: when women have nervousness, anxiety and other depressing emotions, eat cold, spicy food, etc., will also lead to menstrual abdominal pain aggravated. Secondary dysmenorrhea: adenomyosis, endometriosis, uterine smooth muscle tumor, chronic pelvic inflammatory disease, endometrial polyps, uterine adhesions or stenosis, pelvic stasis syndrome, etc. can cause abnormal uterine contractions and spasms, leading to secondary dysmenorrhea. Therefore, you should pay attention to improving your lifestyle and relieving mental stress in your daily life, and if you experience abnormal pain and bleeding during menstruation, you need to consult a doctor as soon as possible.