Post-void dribbling, also known as post-micturition dribbling (PMD), occurs when urine remaining in the urethra after voiding the bladder dribbles out after urination has completed. A common and usually benign complaint, it may be a symptom of urethral diverticulum, prostatitis and other medical problems. A distinction has been made between PMD and urine residue in the urethra that can be waited out or shaken off manually from the penis. A study had found that all males, even those without PMD, pass some volume of urine after micturition. It has thus been suggested that PMD should be regarded as a normal occurrence in men, due to the inherent anatomy of the male urinary system resulting in some urine residue being retained, rather than a disease.