Allergies happen when your immune system overreacts to environmental substances that are otherwise not harmful. You can get an allergy against food, dust, plant pollen, pet dander or insect bites. Every allergy has its own identifying symptoms. So while allergic rhinitis shows up as runny nose, itching and sneezing, food allergies cause chest tightness, breathing difficulties and swelling. Skin allergies include contact dermatitis and eczema.
Avoidance of triggers is usually the best way to prevent allergies. When symptoms do appear, they are treated through anti-histamines (medicines like Allegra and Cetirizine help to suppress histamines which are released by the body whenever there is an allergic reaction). Medications like decongestants may also be prescribed by a doctor for symptomatic control.
Along with medicines, you can also include certain foods in your diet for relief from the symptoms of allergy. Here is a list you can pick from: