The effects of aspirin are divided into two types. The first, antipyretic and anti-inflammatory effect, is used for some febrile diseases, to play the role of antipyretic and anti-inflammatory, such as rheumatic fever. The second is anti-platelet coagulation, which is for the prevention and treatment of patients with ischemic cerebrovascular, cardiovascular and cerebrovascular diseases. A relatively large amount, such as 300 mg/day, may be used for treatment. In primary and secondary prevention, that is, prevention of morbidity and recurrence, a smaller amount is used, usually 50-150 mg/day. It should be noted that high doses of aspirin or long-term use of aspirin have certain side effects, the most common of which is irritation of the gastrointestinal tract, inducing peptic ulcers, gastrointestinal bleeding, and even perforation. There is also the effect on the coagulation mechanism, producing some symptoms of bleeding, such as bleeding from teeth, nose bleeding, blood in urine, including hemoptysis and bleeding from the skin mucous membrane. When these symptoms occur, it is important to stop the drug immediately and then go to the hospital.