Why do i feel mild pain at the side of lower back before and after urination? and feel pain sometimes in pelvis on bladder area. what is it?

It's time to: Be seen by a physician. Anything from kidney tract stones to urethral rumors if you are a smoker need to be considered. We can only narrow the possibilities only if we can sit with you, take a good history, examine you, check your urine, and go from there.

UTI: Evaluation of pain during urination would start with a urinalysis. If you are on treatment for a uti, your doctor needs to review your progress, results of previous culture tests, and do a physical examination. Good luck.