Allergies are an immune response to something that is not actually a threat. Allergies are very diverse, the most common ones are to pollen (Hay Fever), but it can vary from food to even cold itself. The best response is antihistamine drugs. If your allergy is a medicine, remember the specific medicine and tell any medical professional that's treating you.
Severe allergies, such as food allergies or insect sting allergies, may cause anaphylactic shock. To treat this, lay down the patient, elevate the legs, and use a epinephrine injector if available. Call 911.
Some things to keep in mind