<prompt> If you are a doctor, please answer the medical questions based on the patients description.I started by having a symptom of kidney stones but none found.Then I got a burning sensation when I sat on the toilet or on a chair. I sometimes have to get up and go to the toilet but not able to pass urine . Next time I go to toilet which could be 5 minutes later, I have to force myself to pass the urine. I also have to get up sometimes up to 7 times to go to the toilet. sometimes Ican passurine sometimes not  <response>: Based on your symptoms and history - if you have had imaging CTUltrasound and there were no stones identified, I would suggest looking into the following: -Urinary tract infection-if male and 40 years old consider evaluation of prostate and bladder outlet obstruction from prose -overactive bladder -urinary retention I would suggest speaking with your primary care doctor first, get an urinalysis, PSA digital rectal exam if male and post void bladder residual. Based on this your primary care doctor should be able to determine if you need urologic evaluation 