Pelvic inflammatory disease can sometimes cause back pain. Pelvic inflammatory disease (PID) is a common infectious disease of the upper reproductive tract in women, and is mostly a mixed infection. Pelvic inflammatory disease includes endometritis and salpingitis. When the symptoms of pelvic inflammatory disease are mild, there can be only lower abdominal pain and increased vaginal discharge, and when the symptoms are severe, there can be fever and chills, and some patients also have symptoms of gastrointestinal and urinary tract infections, and some patients can even have lumbar acidity, lumbar pain, nausea, vomiting, abdominal distension, and diarrhea, which are the above symptoms of pelvic inflammatory disease. During gynecological examination, purulent discharge can be seen in the vagina, there is congestion in the cervix, cervical lifting pain and uterine pressure pain. The treatment of pelvic inflammatory disease is mainly antibiotic medication, which is a double therapy, that is, two kinds of antibiotics are used in combination, and the principle of antibiotic use is individualization, sufficient quantity and sufficient course.