Hi and welcome to Healthcaremagic. Thank you for your query. I am Dr. Rommstein, I understand your concerns and I will try to help you as much as I can. In most cases if malignancy is excluded as you mentioned, this is caused by urinary infection or urinary stones so you should do urine analysis, urinoculture and kidneys ultrasound to rule these out. Also, vesicoureteral reflux may be possible cause which is anomaly of bladder but can be easily treated. You should drink raspberry tea and plenty of water till you do tests- Also, avoid sexual intercourse and have keep good hygiene. You should reduce salt in your diet as well. In most cases this is self limiting but sometimes antibiotics are required and more invasive tests such as cystoscopy or J prothesis insertion. I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health.