In general, the side effects of aspirin in small doses are not great. Common adverse reactions include damage to the gastric mucosa, especially in patients with gastric ulcer or duodenal ulcer who take aspirin for a long time, there is a risk of gastric bleeding, so pay attention to the color of the stool, pay attention to the presence of heartburn, nausea and vomiting. For patients with allergic reactions, patients with asthma must pay attention when taking aspirin, because aspirin may induce asthma, in addition to aspirin may cause dizziness, headaches and other neurological symptoms, and may also cause damage to liver function and kidney function.