What side effects can regular (low-dose or “everyday”) aspirin cause?
Regular aspirin can cause side effects in several body systems, most commonly the stomach and bleeding risk.
Stomach and digestive side effects
Aspirin can irritate the stomach lining and increase the chance of stomach or intestinal bleeding. Reported effects include:
- Stomach pain or burning/heartburn
- Nausea or vomiting
- Indigestion
- Diarrhea or constipation
- Black, tarry stools (a sign of bleeding)
- Vomiting blood or material that looks like coffee grounds (a sign of bleeding)
Bleeding and bruising
Aspirin affects blood clotting. People may notice:
- Easy bruising or nosebleeds
- Bleeding that takes longer to stop
- Heavier-than-usual menstrual bleeding
- Serious internal bleeding (can be life-threatening)
Allergy-type reactions (including aspirin sensitivity)
Some people develop reactions such as:
- Hives, itching, swelling
- Wheezing or shortness of breath
- Severe allergic reactions (rare but possible)
- Asthma flare-ups in people with aspirin-sensitive asthma
Common neurologic effects
Some people report:
- Headache or dizziness
What are the serious warning signs that mean stop aspirin and get urgent care?
Seek urgent medical attention if aspirin causes any of the following:
- Black, tarry stools or blood in stool
- Vomiting blood or coffee-ground material
- Severe stomach pain
- Unusual or heavy bleeding (bleeding that won’t stop, coughing blood, or severe bruising)
- Fainting, severe weakness, or signs of major blood loss
- Trouble breathing, facial swelling, or widespread hives
Who is more likely to get side effects from aspirin?
Risk tends to be higher for people with:
- A history of stomach ulcers or gastrointestinal bleeding
- Use of other medicines that increase bleeding risk (for example, blood thinners or certain anti-inflammatory drugs)
- Uncontrolled high blood pressure
- A history of aspirin-triggered asthma or aspirin allergy
- Older age, which increases the risk of bleeding complications
Does “enteric-coated” or “buffered” aspirin reduce side effects?
Enteric-coated or buffered aspirin may reduce stomach irritation for some people, but it does not eliminate the bleeding risk. The risk of gastrointestinal bleeding can still occur.
Are there alternatives if aspirin causes stomach or bleeding problems?
This depends on why aspirin is being taken (pain relief vs heart/stroke prevention). Clinicians may consider dose changes, different formulations, or alternative medicines, especially if there is a history of ulcers or bleeding. A pharmacist or clinician can suggest options based on your medical history and current medications.
If you tell me your dose (for example, 81 mg vs 325 mg), how long you’ve been taking it, and what side effects you’re noticing, I can help you judge what’s most consistent with aspirin and what needs prompt medical attention.