What is an Allergy and Symptoms of Allergy | Treatment

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Sneezing, nasal congestion, wheezing, and redness are all allergy symptoms. Grass, weed, tree pollen, and mould pollen can cause seasonal allergies. Dander allergies to cats and dogs are very frequent. Peanut and milk allergies are common.

Allergies arise when your immune system reacts to a foreign substance, such as pollen, bee venom, and pet dander, and a food that ordinarily does not provoke a reaction.

Antibodies are produced by your immune system. When you have allergies, your immune system produces antibodies that mistakenly perceive a harmless allergen as hazardous.

Your immune system may react to an allergen by inflaming your skin, sinuses, lungs, and digestive tract.

Allergies can range in intensity from moderate annoyance to anaphylaxis, a potentially life-threatening condition. While most allergies cannot be cured, there are therapies that can help you manage your symptoms.

What’s an Allergy?

It’s what happens when your immune system responds to a normally innocuous substance. Pollen, mildew, and animal dander, as well as specific foods and objects that irritate your skin, are examples of triggers, which doctors refer to as “allergens.”

Allergies are a relatively common occurrence. At least one out of every five Americans has one.

An allergic reaction is an overreaction of the immune system to the consumption of certain foreign substances. The reaction is amplified because these foreign chemicals are generally considered innocuous by the immune system in nonallergic people and do not trigger a reaction.

The body detects the material as alien in allergic people, and the allergic portion of the immune system responds.

The compounds that cause allergies are referred to as “allergens.” Pollen, dust mites, moulds, animal proteins, foods, and pharmaceuticals are just a few examples of allergens.

When an allergic person is exposed to an allergen, the immune system responds by producing IgE antibodies. The term “allergic” or “atopic” refers to those who are prone to allergies.

During an Allergic Reaction, What Happens?

It all begins when you inhale, ingest, or come into touch with a trigger.

Your body responds by producing IgE, a protein that binds to allergens. The blood is then flooded with histamine and other substances. The symptoms you’re experiencing are the result of this.

Facts about Allergies

  1. Allergy is a condition in which the immune system reacts abnormally to common items such as foods, hairy animal dander, or pollen.
  2. The immune system is a complicated mechanism that protects the body against outside invaders like germs and viruses while also looking for abnormal alterations in the individual’s own cells.
  3. Allergens are foreign chemicals that produce an allergic reaction in the body.
  4. Allergies may occur at any age, even maturity, despite the fact that many people outgrow them over time.
  5. Both the environment and heredity have a role in the development of allergies. If a person has a family history of allergies, especially in their parents or siblings, they are more likely to acquire allergic diseases.
  6. People who are under the age of 18 or who have a personal or family history of asthma or allergies may be more susceptible to allergies.
  7. According to some researchers, those delivered by caesarean delivery have a higher risk of allergies since they are not exposed to the mother’s microbiota during labour.


When your immune system misidentifies a typically innocuous chemical as a hazardous intruder, an allergy develops. The immune system then creates antibodies that keep the body on the lookout for the allergen in question.

When you’re exposed to the allergen again, these antibodies might produce a variety of immune system chemicals that trigger allergy symptoms, such as histamine.

The following are some of the most common allergy triggers:

  • Pollen, animal dander, dust mites, and mould are examples of airborne allergens.
  • Wheat, soy, fish, Peanuts, shellfish, eggs, & milk, to name a few.
  • Stings from insects, such as bees or wasps.
  • Antibiotics, especially penicillin and penicillin-like antibiotics.
  • Latex or other things you come into contact with that might trigger allergic responses on your skin.


Inflammation and irritation are caused by allergic reactions. The type of allergen, however, will determine the precise symptoms.

Allergies can affect the stomach, skin, sinuses, lungs, eyes, and nasal passages, for example.

Some allergy triggers are listed below, along with the symptoms they may produce.

Pollen & Dust

  • A nose that is obstructed or clogged.
  • Red, watery eyes and a scratchy nose.
  • Sneezing.
  • Eyes that are puffy and watery.
  • Itchy throat.


  • Vomiting.
  • A bloated tongue.
  • A tingling sensation in the tongue.
  • Lips, cheeks, and neck swelling are some of the symptoms.
  • Stomach pains.
  • Breathing problems.
  • Rectal bleeding, which is most common in youngsters.
  • A burning sensation in the tongue.
  • Diarrhea.

Stings caused by insects

  • Wheezing.
  • A lot of edoema at the sting location.
  • A decline in blood pressure without warning.
  • Scaly skin.
  • Breathing difficulties.
  • Restlessness.
  • Hives, or a rash that is red and itchy and spreads all over the body.
  • Dizziness.
  • A coughing.
  • Tightness in the chest.


Allergies to foods and insect stings, for example, can result in anaphylaxis, a life-threatening reaction. Anaphylaxis is a potentially fatal medical emergency that can send you into shock.

Anaphylaxis has the following signs and symptoms:

  • Diarrhea.
  • A decrease in blood pressure (hypertension).
  • Excessive breathlessness.
  • Dermatitis.
  • Lightheadedness.
  • A fast, sluggish heartbeat.
  • Vomiting and nauseousness.


  • Wheezing.
  • Tongue, lip, and facial swelling.
  • Itchy skin.
  • Itchiness.

Anaphylaxis might occur if symptoms become too severe.

When you experience an allergic response, what do you do?

An allergic response happens when a person with a specific allergen comes into touch with it:

  • An antibody response is triggered when an allergen (such as pollen) enters the body.
  • Antibodies bind to mast cells and cause them to become inflamed.
  • Mast cells respond by producing histamine when pollen comes into touch with antibodies.
  • When histamine is released as a result of an allergy, the inflammation (redness and swelling) that results is irritating and unpleasant.

Some chemicals and food additives can produce similar effects. If they don’t involve the immune system, though, they’re referred to as unpleasant responses rather than allergies.

What bodily parts could be affected?

Depending on the allergen and how it enters the body, people will have a variety of symptoms. At the same time, allergic responses can affect several regions of the body.

Throat, nose, eyes, and sinuses

The release of histamine causes the nasal epithelium to generate more mucus and become swollen and irritated when allergens are breathed in.

It makes your nose run and itchy, and it might make you sneeze a lot. People may have a sore throat and their eyes may leak.

Chest & Lungs

During an allergic response, asthma might be caused. The lining of the lungs’ airways expands when an allergen is breathed in, making breathing harder.

Intestines & Stomach

Peanuts, shellfish, dairy products, and eggs are all typical allergy triggers. Cow’s milk allergy can cause dermatitis, asthma, colic, and stomach discomfort in newborns.

Lactose intolerance affects certain people (milk sugar). Lactose intolerance causes gastrointestinal problems, however it’s not the same as lactose allergy.


Atopic dermatitis (eczema) and urticaria are two skin conditions that can be induced by allergies (hives).

What methods are used to identify allergies?

Don’t wait to see if your symptoms go away if you suspect you have allergies. Make an appointment with an allergy/immunology expert if your symptoms continue more than a week or two and tend to return.

Allergy skin testing might help you figure out which allergens are causing your symptoms. The test involves pricking your skin with an allergen extract and then observing your skin’s reaction.

Blood work may be conducted if a skin test is not possible. The sensitivity of this test is not as high as that of a skin test. The test determines how many antibodies your immune system produces. Antibodies with higher levels indicate a probable sensitivity to that antigen.

Treatments for Allergies

Staying away from whatever causes an allergic reaction is the greatest method to avoid allergies. If this isn’t practicable, therapy alternatives are available.


Antihistamines are commonly used in allergy therapy to reduce symptoms. It doesn’t matter if the drug is over-the-counter or if it’s on a prescription. Your doctor’s advice will be based on the severity of your allergies.

Medications for allergies include:

  • Diphenhydramine and other antihistamines (Benadryl).
  • Corticosteroids.
  • Cetirizine is a kind of cetirizine that is used to (Zyrtec).
  • Loratadine is a kind of loratadine (Claritin).
  • Sodium cromolyn.
  • Decongestants (decongestants).
  • Modifiers of leukotrienes.

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