An allergic reaction is your body’s response to a substance that it deems dangerous or potentially deadly. Spring allergies, for example, are caused by pollens or grasses. A deadlier type of allergic ...

Anaphylactic shock is a rare but severe allergic reaction that can be deadly if you don't treat it right away. It's most often caused by an allergy to food, insect bites, or certain medications. A ...

If you or someone you’re with is experiencing anaphylaxis, call 911 or your local emergency services immediately. Help them use an epinephrine auto-injector (sometimes called an EpiPen) if they have ...

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 ...

An allergic reaction, or rash, to amoxicillin can involve papules or hives. It usually clears after stopping amoxicillin. Anyone with an amoxicillin rash needs prompt medical advice, as some reactions ...