A hypersensitivity reaction happens when the immune system mistakenly identifies harmless substances as harmful. There are several types of hypersensitivity reactions, depending on the class of ...

Shortly after the Twin Towers fell on September 11, 2001, the nation began to mourn, and around the country Americans began to commemorate the victims and demonstrate their patriotism. Some flew the ...

Skeeter syndrome is an allergic reaction to proteins in mosquito saliva, leading to symptoms that extend beyond the typical red, itchy bumps. Certain factors increase the risk of mosquito bites and ...

Bee, wasp, yellow jacket, hornet, and fire ant are the insect stings that most often trigger allergic reactions. But most people aren't allergic to insect stings and may mistake a normal sting ...