Lumbar protrusion is also known as lumbar disc herniation, the cause of penile numbness, considerations and cauda equina nerve compression, but also may be sedentary, penile nerve injury. 1. Cauda equina nerve compression: patients with lumbar disc herniation, when the disease is more serious, may compress the cauda equina nerve, further causing numbness and pain in the lower limbs, which also includes numbness of the penis. 2. Long-term sedentary: If the patient is engaged in white-collar industry, sitting in front of the computer for a long time, may be due to prolonged sedentary, the penile area of the nerve compression, and then there will be the phenomenon of penile numbness, and the lumbar intervertebral disc herniation has nothing to do with the phenomenon. 3. Penile nerve injury: some patients may be in the process of sexual life, because of violent sex, resulting in dorsal penile nerve injury, and then there will be penile numbness symptoms, and lumbar disc herniation has nothing to do. After the patient appears penis numbness, should according to their own situation, with the doctor to clarify the specific reasons, and then do targeted treatment and therapy.