What side effects can happen from frequent (regular) aspirin use?
Frequent or long-term aspirin use can cause side effects, with the biggest risks involving bleeding and stomach irritation.
Aspirin can harm the lining of the stomach and intestines, which may lead to:
- Heartburn, stomach pain, or nausea
- Stomach or intestinal ulcers
- Gastrointestinal bleeding (which can be serious) [1]
Because aspirin affects blood clotting, it can also increase bleeding risk in other ways, such as:
- Easy bruising
- Nosebleeds
- Bleeding that takes longer to stop [1]
How does aspirin affect bleeding risk and ulcers?
A key concern with frequent aspirin use is that it can make the gastrointestinal tract more vulnerable to injury and it can reduce the blood’s ability to clot. That combination increases the risk of ulcers and bleeding. This can become dangerous without obvious warning signs, especially in older adults or people who also take other bleeding-risk medicines [1].
What warning signs should make someone stop and seek urgent care?
If you take aspirin frequently, seek urgent medical attention if you notice signs that could indicate bleeding, such as:
- Vomiting blood or material that looks like coffee grounds
- Black, tarry stools or blood in stool
- Severe or persistent stomach pain
- Unusual, heavy, or prolonged bleeding [1]
Are there risks beyond the stomach, like allergic reactions or breathing problems?
Some people can have aspirin-related allergic reactions or intolerance, which may include:
- Hives or swelling
- Wheezing or shortness of breath (especially in people with aspirin-sensitive asthma) [1]
If aspirin triggers breathing symptoms or widespread rash, it is important to get medical advice promptly.
Who should be extra cautious about frequent aspirin?
Risk can be higher if you:
- Are older
- Have a history of stomach ulcers or gastrointestinal bleeding
- Take other medicines that also raise bleeding risk (for example, anticoagulants or other antiplatelet drugs)
- Use alcohol heavily [1]
Does the dose matter?
Yes. Higher doses and more frequent use generally increase the chance of side effects, especially stomach bleeding. People taking aspirin for heart/stroke prevention often use low-dose (often called “baby aspirin”), but even low-dose therapy can still raise bleeding risk [1].
Can aspirin side effects be prevented?
Common harm-reduction approaches include taking aspirin with food and using the lowest effective dose if it’s being used long term, but whether that’s appropriate depends on why you’re taking it and your medical history. If you have ulcer disease or prior bleeding, clinicians may recommend different strategies rather than aspirin [1].
Are there alternatives if aspirin causes problems?
Alternatives depend on why you’re using aspirin (pain/fever vs prevention of cardiovascular events). Some people may switch to other pain or anti-inflammatory options, but those alternatives can carry different risks. A clinician can help match the best option to your specific condition and bleeding-risk profile [1].
Sources
[1] https://www.nhs.uk/medicines/aspirin/uses-people-who-should-not-take-aspirin/side-effects/