Allergen: A substance the body sees as harmful. In response, an allergic reaction is triggered.
Allergist: A doctor who diagnoses and treats allergy-related conditions.
Asthma : A long-term inflammatory lung disease. Symptoms include breathing problems, fatigue, headaches, wheezing, and coughing. The triggers include allergens, an infection, exercise, cold air, or other things.
Bronchitis : An inflammation of the lung's airways. Symptoms include a persistent cough and phlegm that lasts at least 5 days. Acute bronchitis can last up to 3 weeks and is typically caused by a virus. Chronic bronchitis is a type of lung disease that frequently affects smokers and people who live in places with lots of pollution.
Eczema : Chronic inflammation that causes a skin rash. It may be a reaction to an allergen. Symptoms may include itching, crusting, blisters, and scaling. Atopic dermatitis is a type of eczema that gets worse after you come in contact with an allergen.
Hay fever : Also known as allergic rhinitis. Hay fever is an inflammation of the mucous membranes in the nose. The condition often stems from allergies to pollen, dust, certain foods, and other substances. Symptoms include sneezing, itching, a runny nose, and nasal congestion.
Histamine: A chemical released by the immune system after it's exposed to an allergen. It causes tissues to become swollen, inflamed, itchy, and red.
Hives : An allergic reaction of the skin. Symptoms include itchy, swollen, red bumps that appear suddenly. Hives can show up anywhere, including on the lips, tongue, and ears. The condition is also known as urticaria.
Nasal spray: Over-the-counter or prescription drugs that can treat and prevent nasal symptoms like congestion and a runny nose.
Occupational asthma : Breathing problems caused by potentially harmful substances found where you work, including fumes, dust, gases, and other irritants. This may also be caused by flour, known as "baker’s asthma."
Rhinitis: See "Hay Fever."