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Everything You Need to Know About Allergies
Medically reviewed by Alana Biggers, M.D., MPH — Written by Brian Krans and Kimberly Holland — Updated on June 5, 2018
Symptoms
Skin allergies
Causes
Treatments
Natural remedies
Diagnosis
Blood test
Prevention
Complications
Asthma
Cold
Cough
Bronchitis
Babies
Takeaway
Allergies
An allergy is an immune system response to a foreign substance that’s not typically harmful to your body. These foreign substances are called allergens. They can include certain foods, pollen, or pet dander.
Your immune system’s job is to keep you healthy by fighting harmful pathogens. It does this by attacking anything it thinks could put your body in danger. Depending on the allergen, this response may involve inflammation, sneezing, or a host of other symptoms.
Your immune system normally adjusts to your environment. For example, when your body encounters something like pet dander, it should realize it’s harmless. In people with dander allergies, the immune system perceives it as an outside invader threatening the body and attacks it.
Allergies are common. Several treatments can help you avoid your symptoms.
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