Bay aspirin is a common medication for patients with cardiovascular disease, with side effects including bleeding and gastrointestinal damage. Bay aspirin, which is a more common drug in our life, is known as a century-old drug in pharmacy. It has antipyretic, analgesic and anti-inflammatory effects, while it is now mostly used as an anti-platelet drug for the prevention and treatment of atherosclerotic cardiovascular and cerebrovascular diseases. The main side effects include: 1. As the most widely used antiplatelet drug, the most serious side effect of Bay aspirin is bleeding, including severe cerebral bleeding and gastrointestinal bleeding. 2. Another common side effect of Bay aspirin is gastrointestinal damage. Long-term application of this product may easily lead to gastric mucosal damage, causing gastric mucosal erosion, ulceration and gastric bleeding. If there is no better drug to replace aspirin treatment, you can add stomach protectors such as ranitidine and pantoprazole when taking aspirin to prevent stomach ulcers and stomach bleeding symptoms. Other side effects of aspirin include: (1) allergy, characterized by bronchospasm, acute urticaria, angioneurotic edema, severe rhinitis, etc.; (2) liver and kidney damage: associated with excessive doses of aspirin, which can mostly be recovered after stopping the drug. (4) In addition, patients who are taking glucocorticoids, patients who are taking other anticoagulants, patients with hyperuricemia, pregnant women, lactating women, patients with severe glucose-6-phosphate dehydrogenase deficiency, etc. should be taken under medical supervision. There are some side effects while Bay aspirin plays a therapeutic role, but the chance of them occurring is very small when taken regularly under the guidance of a doctor, so patients with clear indications should insist on taking the drug regularly.