Having nodules in the pelvic peritoneum may cause dysmenorrhea. Nodules in the pelvic peritoneum may be caused by endometriosis, tumor metastasis, and other causes. Peritoneal endometriosis in endometriosis, lesions in the uterine rectal recess and other places, can appear local scattered brown bleeding spots, granular scattered nodules. At the onset of menstruation, symptoms of dysmenorrhea are present and progressively worsen. Pelvic peritoneal nodules may be caused by metastatic foci of ovarian malignancy, pelvic and abdominal malignancy, etc., and may cause abdominal pain, abdominal distension, and other symptoms, and pain during non-menstrual periods. Pelvic peritoneal nodules suggest perfect examination to exclude malignant tumors and other diseases. Pelvic peritoneal nodules suggest timely consultation, complete examination under the guidance of the doctor to clarify the diagnosis and give appropriate treatment.