Neurological symptoms caused by contrast media include dizziness, headache, nausea and vomiting, chest tightness, panic, etc.; in addition to other manifestations such as redness or whiteness, itching of the skin, sneezing, drop in skin temperature and even difficulty in breathing, drop in blood pressure, and in severe cases, loss of consciousness. The main contrast agents are barium sulfate, iodine preparation, pantethine glucosamine and so on; they are mainly used for the imaging of digestive tract, brain, cardiovascular, urinary system and so on; they are used for the accuracy of diagnosing the disease and facilitating the treatment; they are used with caution for hyperthyroidism, old age and frailty, children, severe anemia and so on, and are forbidden to those who are allergic to them. Neurological symptoms caused by contrast media are mainly related to allergy. When the contrast agent causes symptoms, treatment should be carried out, and the treatment can be intravenous or intramuscular dexamethasone, anti-blocking amine drugs such as cetirizine and loratadine anti-allergy. It is recommended that patients ask for a detailed history of allergy before the use of contrast media, and do allergy experiments during ct and related examinations, and patients should go to regular hospitals for examinations under the guidance of professional doctors.