👉 A radioanaphylaxis is a serious allergic reaction that occurs when an individual's body recognizes a foreign substance (the allergen) as being harmless. This can happen in people who are allergic to certain substances, such as peanuts or fish, and in those who have previously been exposed to the allergen. Symptoms of a radioanaphylaxis include difficulty breathing, chest pain, swelling in the face, neck, throat, or stomach, hives on the skin, itching, and short
