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An allergy is a reaction by your immune system to something that does not bother most other people.
Why it happens
Normally the immune system — your body's defence — fights germs. In most allergic reactions it is responding to a false alarm. Both genes and the environment probably play a part. People with allergies are often sensitive to more than one thing.
Common triggers
- pollen;
- dust mites;
- mould spores;
- pet dander;
- food;
- insect stings;
- medicines.
Symptoms
Allergies can cause a runny nose, sneezing, itching, rashes, swelling or asthma. They range from minor to severe; anaphylaxis is a severe reaction that can be life-threatening.
Diagnosis and treatment
Doctors use skin and blood tests to diagnose allergies. Treatments include:
- medicines;
- allergy shots;
- avoiding the things that cause the reactions.
Sources
- "Allergy," MedlinePlus, U.S. National Library of Medicine. https://medlineplus.gov/allergy.html
- Rewritten in hubnx's own words.
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