Base of penis (between scrotum and anus) really burns/stings after finishing urination. what might cause this? should i be drinking more fluids? this type of issue only comes and goes.

Dysuria : Men with pain or a burning sensation on urination should be evaluated with a thorough history, a focused physical examination and urinalysis (both urine dipstick and microscopic examination of the urine specimen). Although dysuria may be caused by anything that leads to inflammation of the urethal mucosa, it is most often the result of urinary tract infection. Make an appointment with your doctor.