Low fever is a clinical phenomenon when the body temperature is over 37.5 degrees Celsius. A body temperature of over 37.5 degrees Celsius at the time of menstruation may be due to endometrial inflammation or endometrial tuberculosis. It is recommended to do ultrasound examination after menstruation to find out whether there is any abnormality in the endometrium, and it is also recommended to combine the clinical history with the medical history, and whether the body temperature rises in the afternoon in daily life, and patients with a history of tuberculosis will have fever in the afternoon, which should be paid attention to; if necessary, it is possible to do diagnostic curettage in the sixth to twelfth hour after menstruation, and the scraped out tissues are sent to the pathology for examination, which can confirm the diagnosis. If necessary, diagnostic scraping can be done in the sixth to twelfth hour of menstruation.