Sharp pain in what I think would be the urethra running from maybe the prostate to tip of penis. The pain only ever lasts a few seconds every now and then. I have had this problem for years. Ihave been to a DR before and had urine tests and std tests, all coming back negative. I have no blood in urine or burning pain when urinating. Could this be nerve pain or pain from a lower back issue in scoliosis.