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

Yous can have an allergic reaction afterwards inhaling, eating, or touching an allergen. Doctors can besides use allergens to diagnose allergies and can even inject them into your body as a grade of treatment.

The American Higher of Allergy, Asthma & Immunology (ACAAI) reports that over 50 million people in the United States 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 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 take allergies are typically allergic to i or more of the following:

  • pet dander, such equally the kind from a 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 can vary from mild to astringent. If you get exposed to an allergen for the get-go time, your symptoms may be mild. 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 cherry-red spots on the peel
  • rash
  • itching
  • allergic rhinitis, which may pb to symptoms such as nasal congestion or sneezing
  • scratchy pharynx
  • 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
  • pain or tightness in the chest
  • difficulty swallowing
  • difficulty breathing
  • wheezing
  • fright or anxiety
  • middle palpitations
  • flushing of the face
  • swelling of the confront, eyes, or tongue
  • dizziness or vertigo
  • weakness
  • unconsciousness

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

  • swelling of the airway
  • an inability to breathe
  • a sudden and astringent driblet in blood force per unit area

If y'all feel anaphylaxis, seek immediate emergency help. Without treatment, anaphylaxis can outcome in death.

A chief care physician or an allergist can diagnose allergic reactions.

If you experience symptoms of an allergic reaction, the md will perform an exam and ask you most your health history. If your allergic reactions are severe, they may enquire y'all to go along a journal that details your symptoms and the substances that appear to crusade them.

The medico may desire to lodge tests to make up one's mind what'southward causing your allergy. The most commonly ordered types of allergy tests are:

  • skin tests
  • challenge (elimination-type) tests
  • blood tests

Skin test

A skin test involves applying a pocket-size corporeality of a suspected allergen to the skin and watching for a reaction. The substance may be:

  • taped to the pare (patch examination)
  • practical via a small prick to the skin (skin prick examination)
  • injected just under the skin (intradermal test)

A pare 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 xanthous jackets
  • allergic contact dermatitis, which is a rash y'all get later touching a substance

Claiming (elimination-type) exam

Claiming testing is useful in diagnosing nutrient allergies. It involves removing a food from your diet for several weeks and advisedly watching for symptoms when you eat the food again.

Blood examination

A claret test allows the physician to check your blood for antibodies against a possible allergen. An antibody is a protein your body produces to fight harmful substances.

Blood tests are an pick when skin testing isn't helpful or possible.

If yous feel an allergic reaction and y'all don't know what's causing it, you may demand to see a doctor to determine which substances yous're allergic to. If you take a known allergy and feel symptoms, you lot may not need to seek medical care if your symptoms are mild.

In nigh cases, over-the-counter antihistamines, such as diphenhydramine (Benadryl), can be effective in controlling mild allergic reactions.

Shop for over-the-counter antihistamines online.

Treatment for anaphylaxis

If yous or someone you know experiences a astringent allergic reaction, you should seek emergency medical attention. Check to see if the person is breathing, phone call 911 or your local emergency services, and provide CPR if needed.

People with known allergies often have emergency medications with them, such equally an epinephrine machine-injector (EpiPen, Adrenaclick, Auvi-Q). Epinephrine is deemed a "rescue drug" because it opens the airways and raises blood pressure.

The person may need your help to administer the medication. If the person is unconscious, follow these steps to help foreclose stupor:

  1. lay them on their side
  2. elevate their legs
  3. cover them with a blanket

Once yous place what's causing your allergic reaction, you can take the following steps:

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

You may not be able to avoid an allergic reaction completely, but these steps tin assist yous prevent future allergic reactions.

If y'all take a known allergy, preventing an allergic reaction volition improve your outlook. You can exercise this past avoiding your allergens whenever possible.

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

If you have a mild allergic reaction and seek treatment, you'll have a good chance for recovery. All the same, symptoms may return if you come up into contact with the allergen again.

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

Prompt medical care is also necessary to improve your outcome.