Which pain reliever does not cause stomach upset?

Acetaminophen (Tylenol) is a pain reliever that is less likely to cause stomach upset compared to nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or aspirin. It is generally considered safer for those with sensitive stomachs or gastrointestinal issues. However, it's important to use acetaminophen as directed, as excessive use can lead to liver damage. Always consult a healthcare professional for personalized advice.