The main causes of perineal and lumbar pain are prostatitis, female physiologic period, pelvic inflammatory disease, and urinary stones. 1. Prostatitis: It is the main cause of perineal and low back pain in men. Prostatitis can stimulate the pelvic floor nerves and cause recurrent perineal and low back pain. 2. Female physiological period: most women will have perineal and lumbar pain and weakness during physiological period, which is caused by uterine cavity congestion and will be relieved by themselves after physiological period is over. 3. Pelvic inflammatory disease:A small number of women will also have the symptom of low back pain. When the condition of pelvic inflammatory disease is more serious, it will cause vaginitis, cervicitis and so on, which will lead to pain in the perineum. 3. Urinary stones: In general, the size of small kidney stones will not have any clinical manifestations, the larger stones will lead to lumbar pain, swelling and discomfort, when the stone movement, fall into the ureter, may also cause severe lumbar pain and perineal region of the radiating pain. Perineal and lumbar pain may also be caused by other factors, patients should go to the regular hospital in time, to clarify the cause of the disease, scientific treatment, and strive for early recovery.