Allergies occur when immune system reacts to a foreign substance such as pollen, bee venom or pet dander that doesn't cause a reaction in most people. Immune system produces substances known as antibodies. Some antibodies protects from unwanted invaders that could make you sick or cause infection. When we have allergies, immune system makes antibodies that identify a particular allergen as harmful, even though it isn't.
A food allergy may cause tingling mouth, swelling of the lips, tongue, face or throat, hives, anaphylaxis. An insect sting allergy may cause large area of swelling at the sting site, itching or hives all over your body, cough, chest tightness, wheezing or shortness of breath. A drug allergy may cause hives, itchy skin, rash, facial swelling, wheezing. There will be increased risk of allergies if you have family members with asthma or allergies such as hay fever, hives or eczema.
Children sometimes outgrow allergic conditions as they get older. However, it's not uncommon for allergies to go away and then come back some time later. Depending on the allergy, allergy medications can help in reducing immune system reaction and ease symptoms. Medications can include over-the-counter or prescription medications in the form of oral medications, nasal sprays or eyedrops.