6) Difficulty in passing urine or reduced stream
A patient with kidney stones may complain of having to strain to urinate, pain on urination, the urine stream may be weak, or urine may dribble out during voiding. This is because stones may block urine flow, causing bladder outlet obstruction.
In some cases, bladder outlet obstruction is very severe and causes urine to flow back to the kidneys. The kidneys start to swell from the inside because they are filled with water in a condition known as hydronephrosis. In time, this problem can also affect kidney function and damage its structures.