Does aspirin cause serious side effects?
Yes, aspirin can cause serious side effects, particularly gastrointestinal bleeding, ulcers, and allergic reactions. These risks increase with higher doses, long-term use, or in people over 60, those with a history of ulcers, or concurrent use of other blood thinners.[1][2]
What are the most common serious risks?
- Gastrointestinal issues: Aspirin irritates the stomach lining, leading to ulcers, bleeding, or perforation. This affects up to 15-20% of chronic users and causes over 100,000 hospitalizations yearly in the US.[2][3]
- Bleeding disorders: It inhibits platelet function, raising risks of hemorrhagic stroke, brain bleeds, or excessive bleeding from injuries/surgery. Risk doubles in those with clotting issues.1
- Reye's syndrome: Rare but fatal in children/teens with viral infections; aspirin is contraindicated under age 16.[2]
- Kidney damage: Long-term use can impair kidney function, especially in dehydrated patients or those with pre-existing conditions.[3]
Who is most at risk?
Higher risks apply to older adults, heavy drinkers, smokers, or users combining aspirin with NSAIDs (like ibuprofen), steroids, or anticoagulants (like warfarin). Low-dose aspirin (81 mg) for heart prevention carries lower GI bleed risk (about 1-2 per 1,000 users yearly) than high doses.1
How do symptoms of serious side effects appear?
Watch for black/tarry stools, vomiting blood, severe abdominal pain, dizziness, prolonged bleeding, swelling, or allergic signs like rash/hives, wheezing, or facial swelling. Seek immediate medical help for these.[2][3]
Can you take aspirin if you have certain conditions?
Avoid if you have active ulcers, bleeding disorders, severe kidney/liver disease, or aspirin allergy. It's generally safe short-term for adults without risks, but consult a doctor for heart protection use.1
What precautions reduce serious side effects?
Take with food or antacids, use enteric-coated versions, stick to lowest effective dose/shortest duration, and get regular checkups. Proton pump inhibitors (e.g., omeprazole) cut GI bleed risk by 70-90% in high-risk users.3
[1]: https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/aspirin-know-facts
[2]: https://www.mayoclinic.org/drugs-supplements/aspirin/side-effects/drg-20071198
[3]: https://my.clevelandclinic.org/health/drugs/20412-aspirin-tablets