Brief Answer: You should see an urologist. You should have an abdominal ultrasound. Detailed Answer: Hello, Thank you for using HCM. Usually the stents does not cause pain, when they are in the right position and they are functioning well. They may cause a bothering sensation, or a heaviness sensation into the flanks. As your pain is growing up in intensity, and the urine contains blood within it, you should make an abdominal ultrasound. It helps to differentiate if the stents have moved from the their position, or there are small stones passing throw them that cause pain and blood in urine. If you do not have difficulties in urination, you should keep drinking plenty of liquids. If you experience fever, nausea, difficulties in urination, then you should do a urine analysis and a full blood count. You should discuss the results of the above mentioned exams, with an urologist. Hope this is helpful. Let me know if you need more clarifications. Otherwise please close and rate the answer. Kind Regards, Dr. Juarda