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Your immune organization is responsible for defending the body against leaner and viruses. In some cases, your allowed system volition defend against substances that typically don't pose a threat to the human body. Some of these substances are known as allergens, and when your body reacts to them, it causes an allergic reaction.

You can have an allergic reaction afterward inhaling, eating, or touching an allergen. Doctors can besides use allergens to diagnose allergies and can fifty-fifty inject them into your torso as a form of handling.

The American College of Allergy, Asthma & Immunology (ACAAI) reports that over 50 one thousand thousand people in the Us have some type of allergy.

Doctors don't know why some people experience allergies. Allergies appear to run in families, which means they can be inherited. If y'all have a close family unit fellow member who has allergies, you're at greater risk for developing them.

The reasons why allergies develop are unclear, but some substances are known to commonly cause an allergic reaction. People who have allergies are typically allergic to one or more than of the following:

  • pet dander, such equally the kind from a true cat or dog
  • bee stings or bites from other insects
  • certain foods, including nuts and shellfish
  • sure medications, such as penicillin and aspirin
  • certain plants
  • pollen
  • mold
  • dust mites

The symptoms of an allergic reaction tin can vary from mild to severe. If you become exposed to an allergen for the first time, your symptoms may be balmy. These symptoms may get worse if you repeatedly come into contact with the allergen.

Mild reaction

Symptoms of a mild allergic reaction can include:

  • hives, or itchy reddish spots on the pare
  • rash
  • itching
  • allergic rhinitis, which may lead to symptoms such every bit nasal congestion or sneezing
  • scratchy throat
  • watery or itchy eyes

Severe reaction

Astringent allergic reactions (usually to foods, insect stings, and medications) can crusade the following symptoms:

  • abdominal cramping or pain
  • diarrhea
  • nausea or vomiting
  • hurting or tightness in the breast
  • difficulty swallowing
  • difficulty breathing
  • wheezing
  • fear or anxiety
  • center palpitations
  • flushing of the confront
  • swelling of the face, optics, or tongue
  • dizziness or vertigo
  • weakness
  • unconsciousness

A astringent and sudden allergic reaction known equally anaphylaxis can develop just seconds after exposure to an allergen. This type of reaction results in life threatening symptoms, including:

  • swelling of the airway
  • an disability to breathe
  • a sudden and severe drop in blood pressure

If yous experience anaphylaxis, seek immediate emergency aid. Without treatment, anaphylaxis can issue in death.

A primary care dr. or an allergist can diagnose allergic reactions.

If y'all experience symptoms of an allergic reaction, the physician volition perform an exam and ask y'all well-nigh your health history. If your allergic reactions are severe, they may ask yous to continue a periodical that details your symptoms and the substances that announced to cause them.

The physician may want to society tests to decide what'due south causing your allergy. The most usually ordered types of allergy tests are:

  • pare tests
  • claiming (emptying-type) tests
  • blood tests

Pare examination

A skin test involves applying a modest amount of a suspected allergen to the skin and watching for a reaction. The substance may exist:

  • taped to the skin (patch test)
  • applied via a small prick to the skin (skin prick test)
  • injected simply under the pare (intradermal test)

A peel examination is most valuable for diagnosing:

  • food allergies, such as allergies to shellfish or peanuts
  • mold, pollen, and animal dander allergies
  • penicillin allergies
  • allergies to venom, such as the kind secreted by bees or yellow jackets
  • allergic contact dermatitis, which is a rash you get later on touching a substance

Challenge (emptying-type) test

Challenge testing is useful in diagnosing food allergies. It involves removing a nutrient from your diet for several weeks and carefully watching for symptoms when yous consume the food again.

Blood exam

A blood examination allows the doctor to cheque your claret for antibodies against a possible allergen. An antibiotic is a poly peptide your body produces to fight harmful substances.

Blood tests are an selection when pare testing isn't helpful or possible.

If you experience an allergic reaction and you lot don't know what's causing it, you may need to encounter a doctor to decide which substances you're allergic to. If yous have a known allergy and experience symptoms, you may not demand to seek medical intendance if your symptoms are balmy.

In most cases, over-the-counter antihistamines, such as diphenhydramine (Benadryl), can exist effective in decision-making mild allergic reactions.

Shop for over-the-counter antihistamines online.

Treatment for anaphylaxis

If y'all or someone you know experiences a severe allergic reaction, yous should seek emergency medical attending. Check to encounter if the person is breathing, telephone call 911 or your local emergency services, and provide CPR if needed.

People with known allergies oft take emergency medications with them, such as an epinephrine auto-injector (EpiPen, Adrenaclick, Auvi-Q). Epinephrine is accounted a "rescue drug" because it opens the airways and raises claret pressure.

The person may demand your help to administrate the medication. If the person is unconscious, follow these steps to aid prevent shock:

  1. lay them on their side
  2. drag their legs
  3. encompass them with a blanket

In one case you identify what'southward causing your allergic reaction, you lot tin take the post-obit steps:

  • avoid exposure to the allergen
  • seek medical intendance if you're exposed to the allergen
  • carry medications to help treat anaphylaxis

You may not be able to avert an allergic reaction completely, only these steps can help you forestall time to come allergic reactions.

If you have a known allergy, preventing an allergic reaction will improve your outlook. You can do this by avoiding your allergens whenever possible.

Your outlook will also depend on the severity of your allergy.

If you take a mild allergic reaction and seek treatment, y'all'll accept a skillful chance for recovery. However, symptoms may return if you come into contact with the allergen again.

If you accept a astringent allergic reaction, your outlook will depend on receiving quick emergency care, since anaphylaxis can result in death. If you accept severe allergies, ever carry an epinephrine auto-injector and inject yourself if symptoms occur.

Prompt medical care is also necessary to amend your outcome.