Aspirin, also known as acetylsalicylic acid, is a common over-the-counter medication used to relieve pain, reduce inflammation, and lower fever. It is also used for long-term treatment of cardiovascular diseases due to its blood-thinning properties. However, like any medication, aspirin can have side effects.

Common side effects of aspirin include stomach pain, heartburn, and nausea [1]. More serious side effects can include stomach ulcers, bleeding in the stomach or intestines, and allergic reactions such as hives, swelling, or difficulty breathing [1].

Long-term use of aspirin can lead to a condition called tinnitus, which is a ringing or buzzing in the ears [1]. It can also increase the risk of bleeding, both internally and externally [1].

It is important to note that aspirin should not be given to children and teenagers, as it can increase the risk of Reye's syndrome, a rare but serious condition that can cause liver and brain damage [1].

In addition, aspirin can interact with other medications, such as blood thinners, certain antidepressants, and nonsteroidal anti-inflammatory drugs (NSAIDs) [1]. It is crucial to consult with a healthcare provider before starting aspirin therapy or combining it with other medications.

In conclusion, while aspirin can be an effective medication for pain relief and cardiovascular health, it is not without risks. Common side effects include stomach pain, nausea, and tinnitus, while more serious side effects can include stomach ulcers, bleeding, and allergic reactions. It is important to consult with a healthcare provider before starting aspirin therapy and to be aware of potential drug interactions.

Sources:
[1] DrugPatentWatch.com. (2022). Aspirin Side Effects. Retrieved from <https://www.drugpatentwatch.com/drugs/aspirin/side-effects>