Allergies are your body’s reaction to a foreign protein. Usually, these proteins (allergens) are harmless. However, if you have an allergy to a particular protein, your body’s defence system overreacts to its presence in your body.
Symptoms
Allergy symptoms, which depend on the substance involved, can affect your airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, allergies can trigger a life-threatening reaction known as anaphylaxis.
Hay fever, also called allergic rhinitis, can cause:
- Sneezing
- Itching of the nose, eyes or roof of the mouth
- Runny, stuffy nose
- Watery, red or swollen eyes
A food allergy can cause:
- Tingling in the mouth
- Swelling of the lips, tongue, face or throat
- Hives
- Anaphylaxis
An insect sting allergy can cause:
- A large area of swelling (edema) at the sting site
- Itching or hives all over the body
- Cough, chest tightness, wheezing or shortness of breath
- Anaphylaxis
Treatment
Allergy treatments include:
- Allergen avoidance. Your provider will help you take steps to identify and avoid your allergy triggers. This is generally the most important step in preventing allergic reactions and reducing symptoms.
- Medications. Depending on your allergy, medications can help reduce your immune system reaction and ease symptoms. Your provider might suggest nonprescription or prescription medication in the form of pills or liquid, nasal sprays, or eyedrops.
- Immunotherapy. For severe allergies or allergies not completely relieved by other treatment, your provider might recommend allergen immunotherapy. This treatment involves a series of injections of purified allergen extracts, usually given over a period of a few years.
Another form of immunotherapy is a tablet that’s placed under the tongue (sublingual) until it dissolves. Sublingual drugs are used to treat some pollen allergies. - Emergency epinephrine. If you have a severe allergy, you might need to carry an emergency epinephrine shot at all times. Given for severe allergic reactions, an epinephrine shot (Auvi-Q, EpiPen, others) can reduce symptoms until you get emergency treatment.
