What are specific allergic reactions?

What are specific allergic reactions?

What are specific allergic reactions?

Your body’s immune system overreacts to substances, called allergens, that are usually not harmful. You might get hives, itching, swelling, sneezing, and a runny nose. You might have it if you have itching, redness, and peeling or flaking.

What reaction occurs in the body as a result of an allergic reaction?

In response, your body starts to make a protein called IgE, which grabs onto the allergen. Then histamine and other chemicals get released into the blood. That causes the symptoms you notice.

What is an allergic reaction to a drug called?

Anaphylaxis is a sudden, life-threatening, whole-body reaction to a drug or other allergen. An anaphylactic reaction could occur minutes after you take the drug. In some cases, it could happen within 12 hours of taking the drug.

How do you describe a allergy?

An allergy occurs when the body overreacts to an allergen or ‘trigger’ that is typically harmless to most people. Examples of allergies include allergic rhinitis (hay fever), asthma, eczema, hives and food allergy.

What are the sample causes of allergy?

Causes of allergies

  • Animal products. These include pet dander, dust mite waste, and cockroaches.
  • Drugs. Penicillin and sulfa drugs are common triggers.
  • Foods. Wheat, nuts, milk, shellfish, and egg allergies are common.
  • Insect stings. These include bees, wasps, and mosquitoes.
  • Mold.
  • Plants.
  • Other allergens.

    What is the most common allergic reaction to a drug?

    The most common signs and symptoms of drug allergy are hives, rash or fever. A drug allergy may cause serious reactions, including a life-threatening condition that affects multiple body systems (anaphylaxis).

    What is the difference between a drug allergy and a drug sensitivity?

    Drug intolerance and drug sensitivity can both manifest in multiple forms including dizziness, nausea, headaches, and muscle or joint pain. Unlike drug allergies that usually manifest within a few minutes or hours after drug intake, drug intolerance typically develops over a few days or weeks.

    What are the chemicals that trigger allergies?

    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.

    How long do allergens stay in your body?

    They may take a few hours to a few days to disappear. If the exposure to the allergen continues, such as during a spring pollen season, allergic reactions may last for longer periods such as a few weeks to months. Even with adequate treatment, some allergic reactions may take two to four weeks to go away.