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What are the most common side effects of taking aspirin?
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Common side effects of aspirin include nausea, vomiting, stomach pain, headache, dizziness, and rash. More serious side effects can include an allergic reaction, stomach ulcers, bleeding problems, and liver damage. Aspirin should not be taken by people who have certain medical conditions such as asthma or heart disease. People with these conditions should speak to a doctor before taking aspirin.