Sudden stabbing pain in the urethra, then the possible causes: 1, urinary tract discharge of smaller particle-like stones, in the case of less water, more fluid loss, urine concentration, etc. will be formed in the body than the small stones, sometimes the stone volume is small will be discharged with the urine, in the process of discharge may have a transient pain. The pain will not occur again after the stone is discharged from the body, it is a transient pain, as long as the symptoms are not persistent and progressive progress then no treatment is needed, usually drink more water can be. 2. Acute infection of the urinary tract can also occur when urination suddenly stinging pain, or a short period of urinary frequency, urinary urgency, etc.. This is because the body’s immunity and self-repair can return to normal without medication, so you only need to drink more water and urinate more often without any treatment. 3. Acute spasm of the urinary tract, sudden local contraction of the urethral mucosa during urination and instantaneous return to normal after contraction, may suddenly appear painful urination, but no special treatment is needed, only regular observation. As long as the symptoms do not persist, no special treatment is needed.