Food allergies and insect sting allergies, for example, can cause anaphylaxis, a life-threatening reaction. Anaphylaxis is a life-threatening medical emergency that can send you into shock.
Anaphylaxis symptoms and signs include:
Call 911 or your local emergency number for a severe allergic response or seek emergency medical treatment in person immediately. Give yourself an epinephrine auto-injector (Auvi-Q, EpiPen, or others) right away if you have one.
Even if your symptoms improve after receiving an epinephrine injection, you should visit an emergency room to ensure that they don't return once the injection's effects wear off.
