Urethral calculi refer to the condition where stones get stuck in the urethra causing pain symptoms, and in severe cases, completely block the urethra leading to urinary retention. For this condition, common pain medications are ineffective, and it is necessary to promptly visit the hospital's urology department for a surgical procedure to remove the stones, restore the smooth flow of urination, and minimize damage to the urethra by the stones. Typically, a ureteroscope or cystoscope can be used for holmium laser lithotripsy, or the stones can first be pushed back into the bladder and then fragmented inside the bladder, flushing the crushed stones out of the body. Only after the stones are expelled, the pain symptoms can be fundamentally relieved.