Numbness in the perineum of men may be caused by physiological factors such as prolonged bicycling and sedentary activities, or it may be caused by diseases such as prostatitis and lumbar disc herniation. 1. Physiological factors: prolonged cycling, sitting for a long time, or straining to defecate may lead to local blood circulation disorders, resulting in numbness in the perineum. 2. Prostatitis: Prostatitis may be caused by irregular sex life, pathogen infection, sedentary lifestyle, alcoholism, improper diet and other factors. Patients may experience a heavy feeling in the perineum or pubic region, accompanied by numbness, and may also experience frequent urination, urinary urgency, urethral burning and other symptoms. 3. Lumbar disc herniation: Lumbar disc herniation may be caused by disc degeneration, injury, pregnancy, heredity and other factors. Patients may have lumbar pain, sciatica, lower limbs radioactive numbness, weakness and other symptoms, and some patients show numbness in the perineum. There are many other causes of perineal numbness, and it is recommended that patients go to regular hospitals to find out the cause of the disease in time after eliminating physiological factors, and actively take treatment measures to strive for early recovery.