immune disorders
Overview of Allergic Reactions
Symptoms of Allergic Reactions
Most allergic reactions are mild, consisting of watery and itchy eyes, a runny nose, itchy skin, and some sneezing. Rashes (including hives) are common and often itch. Hives , also called urticaria, are small, red, slightly elevated areas of swelling (wheals) that often have a pale center. Swelling may occur in larger areas under the skin (called Allergies may trigger attacks of Asthma . Certain allergic reactions, called Anaphylactic Reactions , can be life threatening. The airways can narrow (constrict), causing wheezing, and the lining of the throat and airways may swell, interfering with breathing. Blood vessels can widen (dilate), causing a dangerous fall in blood pressure. 