Aspirin is a commonly used medication that can help reduce the risk of heart attacks and strokes. However, like any medication, it can also have potential side effects.

One of the most common side effects of daily aspirin use is gastrointestinal bleeding [2]. This can occur when aspirin irritates the lining of the stomach and intestines, causing bleeding or ulcers [3]. Other potential gastrointestinal side effects include nausea, vomiting, and indigestion [1].

Aspirin can also increase the risk of bleeding in other parts of the body [2]. This can be especially concerning for people who are taking other medications that can increase bleeding risk, such as blood thinners [3]. In rare cases, aspirin can cause bleeding in the brain, which can be life-threatening [2].

Some people may also be allergic to aspirin, which can cause symptoms such as hives, swelling, and difficulty breathing [3]. People who have asthma may be at higher risk of having an allergic reaction to aspirin [1].

Finally, long-term use of aspirin can increase the risk of kidney damage, especially in people who already have kidney problems [3].

It is important to talk to a healthcare provider before starting daily aspirin therapy, as they can help weigh the potential benefits against the risks for each individual patient [2]. They can also help monitor for any potential side effects and adjust the treatment plan as needed [1].

Sources:
[1] https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/aspirin
[2] https://www.mayoclinic.org/diseases-conditions/heart-disease/in-depth/daily-aspirin-therapy/art-20046797
[3] https://www.drugpatentwatch.com/p/tradename/ASPIRIN