hello. i hope that by now you saw a doctor. i had bad stomach aches. finally i went to the doctor got a blood test and in showed i had H pylori it a stomach bacteria and it also causes ulcer. i had to take2different antibiotics and antiacid pill. i hope you are doing well Ulcers cause a gnawing or burning pain in the stomach. However, most people who have stomach pain do not have an ulcer. Your doctor can do tests to decide if your stomach pain is caused by an ulcer. Everyday Pain Relief: Ulcers. Many familiar over-the-counter pain relief drugs can cause harmful side effects for those with ulcers. Here's what you need to know. Dear customer, Thank you for providing quick additional info. Tylenol 3 contains acetaminophen and codeine.This does not help to treat the symptoms of pain of peptic ulcers.Infact this can increase the pain. In general, acetaminophen (the active ingredient contained in Tylenol) is well-tolerated when administered in therapeutic doses. The most commonly reported adverse reactions have included nausea, vomiting, constipation. Hello. I know that Tylenol is said not to cause ulcers or aggrivate ulcers. however. for the past week. every time I take Tylenol my stomach hurts so bad, and radiates into my back. burns. the only thing that somehwat relieves the pain is pepto. Tip Sheet: Ulcers and Pain Relievers. Be cautious about taking over-the-counter pain relief drugs if you have an ulcer. Some can worsen your symptoms. Is Tylenol (Acetaminophen) Bad for Your Stomach? Dr. Sharon Orrange Dr. Orrange is an Associate Professor of Clinical Medicine in the Division of Geriatric, Hospitalist and General Internal Medicine at the Keck School of Medicine of USC. sometimes i get in a bad habit of taking a large dose of tylenol pm--up to 7 or 8 at once even. the inside of my stomach is hurting today almost like a gas pain but i did get sick last night(i threw up and had diarrhea) well i'm just wondering if i have anything to worry about. Chronic use of certain drugs can cause gastric ulcers, but Tylenol is not one of them. On the other hand ibuprophen, or other NSAIDs (non-steroidal anti-inflammatory drugs) can cause gastric ulcers.