About 6 years ago, I experienced some pain in the left side of my stomach that caused me to visit the ER. The surgeon came in (as they were going to prep me for appendicitis surgery) and he touched a spot in my back on the left side and it about shot me out of my skin. Come to find out, I had lots of blood in my urine and I was hospitalized for 5 days with kidney infection. I was put on IV antibiotics and drank plenty of fluids and have had no problems since. I would definitely have him checked just to make sure. Good luck!