Allergen - Wikipedia
An allergen is an otherwise harmless substance that triggers an allergic reaction in sensitive individuals by stimulating an immune response. In technical terms, an allergen is an antigen that is capable of stimulating a type-I hypersensitivity reaction in atopic individuals through immunoglobulin E (IgE) responses. [ 1 ]
Allergens: Types, Function, Risks - Verywell Health
2024年7月31日 · Depending on the type, they may enter your body through your respiratory system, skin, or digestive tract. This article explains types of allergens, how they work, and their risks. It also covers how to diagnose allergies and treat exposure to allergens. Illustration by Michela Buttignol for Verywell Health.
Food Allergies | FDA - U.S. Food and Drug Administration
Food allergies occur when the body's immune system reacts to certain proteins in food. Food allergic reactions vary in severity from mild symptoms involving hives and lip swelling to severe,...
Allergies - Symptoms and causes - Mayo Clinic
2024年8月24日 · Allergy symptoms depend on what allergen is involved. The symptoms can affect the airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe.
Allergen: MedlinePlus Medical Encyclopedia
An allergen is a substance that can cause an allergic reaction. In some people, the immune system recognizes allergens as foreign or dangerous. As a result, the immune system reacts by making a type of antibody called immunoglobulin E (IgE) to defend against the allergen. This reaction leads to allergy symptoms.
Allergy - StatPearls - NCBI Bookshelf
2023年7月31日 · Allergy is a broad topic and speaks to the body’s immune response to foreign substances common in the environment, and triggers a reaction from the body’s immune response described as hypersensitivity.
Overview: Allergies - InformedHealth.org - NCBI Bookshelf
2023年8月8日 · At a glance. Allergies occur when the body overreacts to a harmless substance. Allergies are common – especially ones to pollen, dust mites and animals. Typical symptoms of allergies include a runny or stuffy nose, itching and a rash. Avoiding contact with the allergy-triggering substance can help. Medication can relieve allergy symptoms.
National Institute of Environmental Health Sciences
2024年9月30日 · Introduction. Allergies arise if the body's immune system overreacts to certain foreign substances (allergens) that are normally harmless in most people. Common allergens include pollens, fungal spores, house-dust mites, and animal epithelial materials but can also include drugs, biologic products, and insect venoms.
What Causes Allergies? Common Allergens and Other Factors
2024年5月9日 · Allergies develop when your immune system reacts to a foreign substance called an allergen, like pollen, bee venom, pet dander, or food. Learn more.
Allergies: Symptoms, Reaction, Treatment & Management - Cleveland Clinic
Allergies occur when your immune system mistakenly triggers an allergic reaction to an allergen. Allergic reaction symptoms include congestion, watery eyes, a runny nose, vomiting and, in severe cases, anaphylaxis.