The harm of abdominal enhancement CT to the body mainly refers to the damage of radiation to the human body, as well as the damage of the contrast agent to the human body. Radiation damage to the human body is generally not a big problem, will not cause too much impact on the human body, while the contrast agent damage to the human body is different from person to person, mild patients can appear localized fever, pain, nausea, vomiting, hives, etc., serious patients may appear laryngeal edema, bronchospasm, pulmonary edema, blood pressure drop, shock, coma or even respiratory and cardiac arrest. There is also a part of the patient is prone to contrast nephropathy, especially the elderly patients and patients with poor renal function, so before the examination, patients must do contrast allergy test, as well as renal function related to the examination.