Question: what are the first physical signs and symptoms of an anaphylactic reaction to contrast medium?
Answer: Symptoms tend to occur around 30 minutes after exposure to the contrast agent. Initial symptoms may be mild, like hives or itching. More moderate reactions can include nausea, vomiting, chills, abdominal cramps, facial or laryngeal edema, shortness of breath, wheezing, hypertension, and headache.