Back pain after masturbation may be caused by overwork, or considered to be caused by lumbar muscle strain, prostatitis and other diseases. 1. Excessive fatigue: If you masturbate for a long time, resulting in excessive fatigue, it may lead to congestion of the lumbar back tissues, back soreness, pain, manifested as back pain after masturbation. This kind of situation is a normal phenomenon, patients need to control the number of masturbation, to ensure sufficient rest time, avoid overwork. 2. lumbar muscle strain: lumbar muscle strain is mostly due to lumbar muscles, fascia, ligaments and other soft tissues cumulative, mechanical, chronic strain. The patient can be out of the lumbar pain, can radiate to the buttocks, after masturbation can aggravate the symptoms of low back pain. 3. Prostatitis: The causes of prostatitis include pathogenic infections, sedentary lifestyle, alcoholism, frequent sexual intercourse, and poor hygiene practices. Symptoms are urinary urgency, urinary pain, heavy pressure feeling on the back, and some patients may have back pain after masturbation. There are many other causes of back pain after masturbation, and it is recommended that patients go to the regular hospital in time to find out the cause of the disease and strive for early recovery.