Aspirin, also known as acetylsalicylic acid, is a commonly used medication that belongs to the class of drugs known as nonsteroidal anti-inflammatory drugs (NSAIDs). It is primarily used to relieve pain, reduce inflammation, and lower fever. While aspirin is generally considered safe and effective when used as directed, it is important to be aware of potential side effects that may occur.

Some of the common side effects of aspirin include gastrointestinal discomfort, such as heartburn, stomach pain, and nausea [2]. Aspirin can irritate the lining of the stomach and increase the risk of developing stomach ulcers or gastrointestinal bleeding, especially when taken in high doses or for a prolonged period [2][3]. Therefore, it is recommended to take aspirin with food or milk to help reduce the risk of stomach irritation [2].

In some cases, aspirin may cause allergic reactions, which can range from mild symptoms like skin rash to severe reactions like difficulty breathing or swelling of the face, lips, tongue, or throat. If any signs of an allergic reaction occur, it is important to seek immediate medical attention [3].

Another potential side effect of aspirin is an increased risk of bleeding, as it can interfere with blood clotting. This risk is especially significant for individuals with bleeding disorders, a history of stomach ulcers, or those taking blood-thinning medications [2][3]. It is important to inform your healthcare provider about any pre-existing conditions or medications you are taking before starting aspirin therapy.

Rare but serious side effects of aspirin include liver damage, kidney problems, and ringing in the ears (tinnitus) [2][3]. If any of these symptoms occur, it is important to consult a healthcare professional.

It is worth noting that the side effects mentioned above are not exhaustive, and there may be other potential side effects associated with aspirin. Therefore, it is important to read the medication's package insert and consult with a healthcare professional for a comprehensive understanding of the potential risks and benefits of aspirin use.

In conclusion, while aspirin is generally safe and effective when used as directed, it is important to be aware of potential side effects. Common side effects include gastrointestinal discomfort, allergic reactions, and an increased risk of bleeding. Rare but serious side effects may include liver damage, kidney problems, and tinnitus. It is crucial to follow the recommended dosage and consult with a healthcare professional if any concerning symptoms occur.

Sources:
[2] Mayo Clinic - Aspirin (Oral Route) Side Effects: https://www.mayoclinic.org/drugs-supplements/aspirin-oral-route/side-effects/drg-20152665?p=1
[3] Drugs.com - Aspirin Side Effects: https://www.drugs.com/aspirin.html