The antiplatelet mechanism of aspirin is mainly through the inhibition of arachidonic acid and cyclooxygenase, thus blocking the synthesis of thromboxane A2 and exerting an antiplatelet effect. At present, aspirin is widely used in clinical practice, especially in cardiovascular diseases and cerebrovascular diseases as a first-line drug, mainly to prevent thrombosis. Of course, aspirin also has some adverse reactions, such as a few patients can appear hives, skin itching and other reactions, but the most common adverse reaction is gastrointestinal discomfort, such as nausea, vomiting, may also appear gastrointestinal bleeding, so for patients with gastric ulcer, must be cautious to use aspirin or follow medical advice to apply aspirin, so that it can reduce the side effects while achieving the maximum antiplatelet effect.