A coronary CT angiogram is usually not painful and has no effect on the organism. Coronary CT angiography refers to the scanning of coronary arteries using multi-row spiral CT after injecting the appropriate contrast agent intravenously, so as to understand the situation of coronary artery lesions, which can be used to determine coronary artery lesions. After the contrast agent is injected, most people will experience a generalized feeling of warmth, which is normal. Some people may experience nausea and vomiting, transient renal insufficiency and other symptoms, which are idiosyncratic reactions in a very small number of people, so there is no need to worry, and the radiation level of coronary CT angiography is very small, and will not affect the organism. Before the examination should be fasting 4-6 hours; taking metformin diabetic patients need to stop 48 hours; allergic to contrast agent, severe renal failure and cardiac insufficiency patients are prohibited to do coronary CT angiography. When doing coronary CT angiography, patients should listen to the doctor’s arrangements, eliminate nervousness and fear; postoperative discomfort, should be timely consultation and treatment, so as not to delay the condition.