My wife recently started experiencing issues while urination. Blood in urine, burning sensation and difficultly while urination. We did sonography and urine test, and it was identified that there was a swelling in her right uterus and urine test indicated infection. After few medications the problem recovered. Again next week she started complaining same. We did the tests again and couldn't find anything else the urine infection. After medications it stopped. But it again started, so we are now worried what happened suddenly. Is there any test which can help us understand what happened suddenly and how this problem can be resolved. Her periods are regular and she had kidney stones which were removed in December 2016. Please advise.