Aspirin is a medication commonly used to relieve minor pains. Aspirin has also been used to prevent heart attacks and strokes. Aspirin, however, can also cause damage to the stomach and/or intestinal lining leading to the development of erosions ("small sores") and/or ulcers ("large sores"). Erosions may cause bleeding ("bleeding ulcers") and/or perforations ("holes in the stomach"). Acetaminophen, often referred by the brand name, Tylenol, is also used to treat minor pains but is not commonly recognized to cause damage to the stomach lining.