The remaining leach after urination is often referred to as dripping after urination, refers to the urine dripping out of the urethra for a period of time after urination, or even a small amount of urine continues to flow after lifting the pants and wetting the pants. There are usually two reasons for this situation: the first, prostatitis and prostate enlargement, resulting in more residual urine in the urethra and this situation. The second, urethral stricture or paraurethral diverticulum, so that the residual urine in the proximal end of the stricture or diverticulum, after urination and then one after another outflow and cause. Therefore, the differentiation is based on the residual urine draining after urination, accompanied by other symptoms.