Does acetaminophen cause ulcers?

Acetaminophen (paracetamol) is not typically associated with causing stomach ulcers in the way that NSAIDs like ibuprofen, naproxen, or aspirin are.

What the evidence suggests

• NSAIDs irritate the stomach lining and reduce protective stomach prostaglandins → higher risk of ulcers and GI bleeding.
• Acetaminophen works mainly through the CNS (and only minimally in the stomach lining), so it usually has a much lower ulcer risk.

Important caveats

• At high doses or with chronic heavy use, acetaminophen can be harmful to the liver, and some people may experience GI discomfort—but ulceration is not a common or expected effect.
• If someone takes acetaminophen along with an NSAID or has major ulcer risk factors (prior ulcer/bleeding, smoking, heavy alcohol use, steroids, anticoagulants), their overall ulcer risk may still be driven mainly by the other factor.

When to get medical help

Seek care promptly if you have signs of ulcer or bleeding, such as:

• black/tarry stools, vomiting blood
• severe or persistent upper abdominal pain
• unexplained anemia, dizziness, or weakness

If you tell me your dose (and how often), your age, and any history of ulcers or GI bleeding, I can help assess your situation more specifically.