Did they take biopsies? I recently had an upper endoscopy and colonoscopy with 8 biopsies taken. I had pain with warm liquid and at the left side of my abdomen and sphincter. This disappated after a couple of weeks. I don't know how many instruments were inserted, but I felt that the pain was in response to the procedure itself. It went away on its own. Call your doctor if it seems unusual for you. He can advise you best. You won't be the first one to ask about this, I'm sure. Good luck.