<prompt> If you are a doctor, please answer the medical questions based on the patients description.hello im 29 years old and last night out of no where i get a pain on my sides the n a really sharp pain in my stomach i couldnt take the pain i cryed and then when i went to sit down i felt the pain on my lower back it felt like there was something inside me. i still feel little sharp pain in my lower stomach as we speak  <response>: Hello! Welcome to Chat Doctor. This sudden severe pain also involving back suggests a stone in urinary tract, more likely in ureter. Stone causes obstruction to urinary outflow so smooth muscles in ureter contract excessively to overcome the obstruction, and so is the colicky pain. Many such patients come in my clinic I advise them ultrasound abdomen pelvis, X-ray PUB, renal function tests, blood sugar urine routine. Treatment is done accordingly. Hope this helps. Wish you good health. Thanks. Regards. 