Coronary CT side effects are mainly the following: 1, the impact of radiation, do this test need to receive X-ray radiation, so women who are pregnant can not do. Young people who are preparing for pregnancy, if you do coronary CT, you should postpone your pregnancy plan, to be able to reduce the impact of this test on the human body.2. Some impact on the kidneys, the contrast agent used in the examination process has to be excreted through the kidneys, if the original kidney function is not good, to do this test may deteriorate the function of the kidneys, serious renal failure can be caused, resulting in anuria, oliguria occurs.3, Allergic reaction, some patients are allergic to this iodine-containing contrast medium, and are prone to fever, rash, and respiratory distress, which need to be promptly observed and treated symptomatically.4. Impact on the function of the thyroid gland, for patients with abnormal thyroid function, this test may affect the function of the thyroid gland due to the application of iodine-containing contrast medium.