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- DictionaryAl·ler·gy/ˈalərjē/
noun
- 1. a damaging immune response by the body to a substance, especially pollen, fur, a particular food, or dust, to which it has become hypersensitive.
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Allergies
Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or a food that doesn't cause a reaction in most people.
Your immune system produces substances known as antibodies. When you have allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn't. When you come into contact with the allergen, your immune system's reaction can inflame your skin, sinuses, ...
When to seek medical or mental health expertAlways seek the advice of your physician or other qualified health provider with any questions you may have regarding your health. Never disregard professional medical advice or delay in seeking it because of something you have read on the community.Allergy symptoms, which depend on the substance involved, can affect your airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, allergies can trigger a life-threatening reaction known as anaphylaxis.
Hay fever, also called allergic rhinitis, can cause:
- Sneezing
- Itching of the nose, eyes or roof of the mouth
- Runny, stuffy nose...
An allergy starts when your immune system mistakes a normally harmless substance for a dangerous invader. The immune system then produces antibodies that remain on the alert for that particular allergen. When you're exposed to the allergen again, these antibodies can release a number of immune system chemicals, such as histamine, that cause allergy symptoms.
Common allergy triggers include:
- Airborne allergens, such as pollen, animal dander, dust mites and mold...
Allergy treatments include:
- Allergen avoidance. Your provider will help you take steps to identify and avoid your allergy triggers. This is generally the most important step in preventing allergic reactions and reducing symptoms.
- Medications. Depending on your allergy, medications can help reduce your immune system reaction and ease symptoms. Your provider might suggest nonprescription or prescription medication in the form of pills or liquid, nasal sprays, or eyed...
Preventing allergic reactions depends on the type of allergy you have. General measures include the following:
- Avoid known triggers. Even if you're treating your allergy symptoms, try to avoid triggers. If, for instance, you're allergic to pollen, stay inside with windows and doors closed when pollen is high. If you're allergic to dust mites, dust and vacuum and wash bedding often.
- Keep a diary. When trying to identify what causes or worsens your allergic symptoms, track your activities and what you...
For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.
© Mayo Clinic
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