A CT scan does not hurt. If a dye is used, you may feel a quick sting or pinch when the IV is started. The dye may make you feel warm and flushed and give you a metallic taste in your mouth. Some people feel sick to their stomachs or get a headache. If contrast media is used in a CT Scan Testing Service, there is a risk of allergic reaction to the media. Patients who are allergic to or sensitive to medications should notify their doctor.