Common potential side effects of aspirin include heartburn, stomach cramps, vomiting, nausea and drowsiness. Serious side effects include anemia, bronchospasm, bleeding of the intestines, hemorrhage within the skull and abnormal liver functionality, states WebMD.
Daily aspirin use can increase the risk of hemorrhagic stroke due to a burst of blood vessels. The risk of gastrointestinal bleeding also increases with intake of aspirin. Aspirin increases the risk of developing ulcers and also increases the danger of bleeding to a life-threatening extent for ulcers patients. Aspirin can trigger an allergic reaction, especially in people with asthma. Indicators of an aspirin allergy include skin rash, breathing problems and swelling of the throat, mouth or lips, reports Mayo Clinic.