What stomach side effects can aspirin cause?
Aspirin can irritate the stomach lining and increase the risk of stomach bleeding. Common stomach-related side effects include burning or pain in the upper abdomen (indigestion/“heartburn”), nausea, and vomiting. More serious problems include ulcers (open sores in the stomach or small intestine) and gastrointestinal (GI) bleeding, which can present as black, tarry stools or vomiting blood.
Why does aspirin harm the stomach?
Aspirin is a non-steroidal anti-inflammatory drug (NSAID). It reduces protective prostaglandins that normally help:
- Maintain the stomach’s protective mucus and bicarbonate layer
- Support blood flow to the stomach lining
Without that protection, the stomach lining is more vulnerable to acid irritation and injury, raising the odds of gastritis, ulcers, and bleeding.
Who is more likely to get stomach problems from aspirin?
The risk goes up with:
- Higher doses and longer use
- History of stomach ulcers or GI bleeding
- Taking other medicines that also increase bleeding or irritation risk, such as other NSAIDs, corticosteroids, or blood thinners
- Age (risk is higher in older adults)
- Alcohol use
What side effects are warning signs of a stomach bleed or ulcer?
Get urgent medical care if you have any of these:
- Black, tarry stools (possible GI bleeding)
- Blood in vomit or vomit that looks like coffee grounds
- Severe or worsening abdominal pain
- Fainting, weakness, or dizziness (can occur with significant blood loss)
How can you reduce aspirin-related stomach risk?
Common strategies include:
- Using the lowest effective dose for the reason you’re taking aspirin
- Taking it with food (can reduce irritation for some people)
- Avoiding combining aspirin with other NSAIDs unless a clinician tells you to
- Asking a clinician whether a stomach-protecting medicine (such as a proton pump inhibitor) is appropriate if you’re at higher risk for ulcers or bleeding
Does “enteric-coated” aspirin help?
Enteric-coated aspirin may reduce irritation for some people, but it does not eliminate the underlying GI risk of aspirin. Bleeding and ulcer risk can still occur, especially at higher doses or with added risk factors.
When should you stop aspirin because of stomach symptoms?
If you develop signs of GI bleeding (black stools, vomiting blood/coffee-ground material) or severe abdominal pain, stop and seek medical care right away. For milder symptoms (new heartburn or nausea), contact a clinician promptly to discuss whether you should adjust the dose, switch options, or add stomach protection—particularly if you take aspirin for heart or stroke prevention.
Alternatives if aspirin upsets your stomach
If aspirin is causing troublesome GI symptoms, ask a clinician what fits your situation:
- For some uses, a different anti-platelet approach may be considered.
- For pain/fever, acetaminophen is often easier on the stomach than NSAIDs, but it won’t provide aspirin’s anti-platelet effect.
If you tell me your dose (e.g., low-dose “81 mg” vs pain doses), how long you’ve taken it, and what symptoms you’re having, I can help you judge which side effects are most likely and what questions to bring to your clinician.