See the DrugPatentWatch profile for aspirin
Why aspirin can cause stomach pain
Aspirin can irritate the stomach lining and affect blood clotting. It belongs to the NSAID (nonsteroidal anti-inflammatory drug) class, which lowers protective prostaglandins in the stomach. With less stomach protection, people can get burning pain, nausea, indigestion, or cramping, and in some cases ulcers or bleeding.
Common symptoms include burning or gnawing pain in the upper belly, discomfort after taking a dose, and sometimes nausea.
How soon after aspirin does stomach ache happen?
For many people, stomach irritation starts soon after a dose, often within minutes to a few hours. If irritation worsens into an ulcer, pain can last longer and may come and go over days.
What symptoms mean it might be an ulcer or bleeding?
Get urgent medical care if aspirin-related stomach trouble includes any of the following:
- Black, tarry stools
- Vomiting blood or material that looks like coffee grounds
- Severe or worsening abdominal pain
- Dizziness, fainting, weakness, or signs of anemia (shortness of breath, unusual fatigue)
- Persistent vomiting or inability to keep fluids down
These can indicate bleeding from the stomach or intestinal lining.
What you can do right now if aspirin upset your stomach
If your symptoms are mild and you are otherwise stable:
- Stop taking aspirin until you can speak with a clinician.
- Avoid other NSAIDs (ibuprofen, naproxen) and alcohol, which can worsen irritation.
- Consider asking a pharmacist or clinician about safer pain/fever alternatives for you.
- If you were taking aspirin for a specific reason (like heart disease or stroke prevention), don’t stop it without medical advice—ask the prescriber what to do next.
If symptoms are still present after stopping aspirin or keep recurring, you likely need medical evaluation.
Does taking aspirin with food or a different dose help?
Taking aspirin with food can reduce stomach irritation for some people, but it does not fully eliminate risk. Higher doses and more frequent dosing increase the chance of ulcers and bleeding. If you need aspirin long-term, clinicians may consider stomach-protection options (such as acid-reducing medicines) depending on your risk.
Who is more likely to get stomach injury from aspirin?
Risk is higher if you:
- Have a history of ulcers or GI bleeding
- Take other medicines that increase bleeding risk (for example, blood thinners like warfarin, apixaban, rivaroxaban; or antiplatelets like clopidogrel)
- Use corticosteroids
- Drink alcohol regularly
- Take high-dose aspirin or multiple NSAIDs
- Are older
When to seek care (timing matters)
Seek same-day medical advice if you have moderate pain, ongoing nausea/vomiting, or symptoms that don’t improve after stopping aspirin. Go to urgent care or the emergency department if you have any bleeding warning signs listed above or severe pain.
Could it be something else?
Yes. Stomach pain after aspirin can also be triggered by unrelated issues (gastritis from other causes, reflux, gallbladder problems, or a virus). That’s why persistent pain or red-flag symptoms should be assessed.
If you tell me:
1) your age, 2) the aspirin dose (mg) and whether it was enteric-coated, 3) when the pain started after taking it, and 4) what the pain feels like and where it is (upper belly vs lower),
I can help you decide how urgent it is and what questions to ask your clinician.