There are many causes of urethral stinging pain when urinating, mainly including urethritis, cystitis and urinary stones. 1. Urethritis: Urethritis is a common cause of bacterial infection, inflammation stimulates the mucous membrane of the urethra may lead to mucous membrane damage, so when the patient urinates, the urine stimulates the sensory nerve endings at the damaged place, which produces the symptom of stabbing pain. 2. Cystitis: Inflammation of the bladder due to bacterial infection and other causes, because the bladder is the site of urine storage, so the patient can also feel pain when urinating. 3. Urinary stones: in this case, it may indicate that the stones are large in size, and the urethra produces irritation, so when urinating, because the urine carries out a flushing effect on the stones, it may irritate the mucous membrane and produce painful symptoms. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.