The causes of dysmenorrhea are divided into primary dysmenorrhea and secondary dysmenorrhea. In primary dysmenorrhea, women do not have organic pathological changes in the reproductive system, and it usually does not affect normal pregnancy. Secondary dysmenorrhea is often caused by organic pathological changes in the reproductive system, such as submucosal fibroids, adenomyosis, ovarian endometriomas, etc. These conditions can change the internal environment of the pelvic and uterine cavities, affecting various aspects such as the implantation of the fertilized egg, thus impacting normal pregnancy. Therefore, when a woman is diagnosed with secondary dysmenorrhea, it is important to identify the cause of the pain and provide appropriate treatment to avoid affecting future normal pregnancies.