The so-called urinary retention refers to the fact that for some reason, either mechanical, neurological or bladder muscle problems, the urine is not excreted properly and accumulates in the bladder. As a result of the large amount of urine accumulating in the bladder, the bladder is distended, and a cloudy, turbid “turbid” sound occurs on percussion in the area where the bladder is located. If percussion is continued toward the head and beyond the bladder, the sound of percussion becomes a drumming sound because the organ underneath the area of percussion is the intestines, which is why there is a drumming sound. The volume and extent of bladder distention can be determined by percussion, and the amount of urinary retention that the patient may have can be roughly estimated.