<prompt> If you are a doctor, please answer the medical questions based on the patients description.During MMA practice I landed hard on the lower left side of my back. 6 hours later I was doing a cardio workout and felt pain deep inside on that lower left area of my back. Nothing horrible but it did interfere with my workout. Could this be my kidney?  <response>: Hello and welcome to Chat Doctor. As a Urologist, i can understand your concern.Its unlikely to be due to, injury to the kidney. The kidney is well protected by the rib cage. However after an examination by a doctor, you should get a scan done. Get an ultrasound or CT scan of the abdomen. This will give an accurate idea, of the cause of pain. If youve any doubt, send the report, as a direct question. Chat Doctor. Manga. 