Allergies: Symptoms, causes and Treatment Options

Written by Medicover Team and Medically Reviewed by Dr Sateesh Pydi , General Medicine

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Allergies are an increasingly prevalent condition that affects millions worldwide. They occur when the immune system reacts to a foreign substance, such as pollen, bee venom, or pet dander, that doesn't cause a reaction in most people.

What Are the Types of Allergies?

Seasonal Allergies

Seasonal allergies, often referred to as hay fever or allergic rhinitis, are among the most common. They are typically triggered by pollen from trees, grasses, and weeds. The symptoms include sneezing, a runny nose, itchy eyes, and congestion.

Food Allergies

Food allergies occur when the immune system reacts to certain proteins found in foods. Common allergens include peanuts, tree nuts, shellfish, milk, eggs, and wheat. Symptoms can range from mild (hives, itching) to severe (anaphylaxis).

Skin Allergies

Skin allergies manifest as reactions on the skin, such as eczema, hives, and contact dermatitis. These can be triggered by direct contact with allergens like latex, nickel, or certain plants.

Insect Sting Allergies

Insect sting allergies are reactions to the venom from stings of insects like bees, wasps, hornets, and fire ants. Symptoms can range from localized pain and swelling to systemic reactions like anaphylaxis.

Drug Allergies

Drug allergies occur when the immune system reacts to medications. Common culprits include antibiotics (like penicillin), aspirin, and nonsteroidal anti-inflammatory drugs (NSAIDs). Symptoms can vary widely from mild rashes to severe anaphylaxis.

What Are the Causes of Allergies?

Allergies are caused by an overreaction of the immune system to a typically harmless substance. When an allergen enters the body, the immune system produces antibodies known as Immunoglobulin E (IgE). These antibodies travel to cells that release chemicals, causing an allergic reaction.

Genetic Factors

Allergies often run in families. If one or both parents have allergies, their children are more likely to develop allergies as well. This genetic predisposition can influence the type and severity of allergies.

Environmental Factors

Environmental factors play a significant role in the development of allergies. Exposure to allergens during childhood, pollution, and lifestyle choices (like smoking) can increase the risk of developing allergies.

Hygiene Hypothesis

The hygiene hypothesis suggests that a lack of exposure to infectious agents during early childhood can increase susceptibility to allergic diseases. In other words, living in overly sterile environments might prevent the immune system from developing properly, leading to allergies.

What Are the Symptoms of Allergies?

The symptoms of allergies can vary depending on the type of allergen and the severity of the reaction.

Respiratory Symptoms

Sneezing
Runny or stuffy nose
Itchy or watery eyes
Coughing
Wheezing or shortness of breath

Skin Symptoms

Hives or welts
Itchy skin
Redness or swelling
Eczema

Gastrointestinal Symptoms

Nausea
Vomiting
Diarrhea
Abdominal pain

Anaphylaxis

Anaphylaxis is a severe, potentially life-threatening allergic reaction. Symptoms can include difficulty breathing, swelling of the throat and tongue, rapid heartbeat, and a drop in blood pressure. Immediate medical attention is crucial.

When to See a Doctor for Allergies?

A general physician, allergist or immunologist can help diagnose and manage your allergies. If symptoms interfere with daily life, cause sleep disruption, or don't respond to over-the-counter treatments, professional evaluation is essential.

You should see a doctor if you have:

Persistent sneezing, nasal congestion, or itchy eyes lasting more than a few weeks despite using antihistamines or nasal sprays.
Frequent allergic reactions to foods, insect stings, or medications are becoming harder to predict or control.
Allergy symptoms that trigger or worsen asthma, causing recurring coughing, wheezing, or shortness of breath.

Get medical help immediately if:

You experience sudden throat swelling, difficulty breathing, or a drop in blood pressure after exposure to an allergen.
You develop hives, rapid heartbeat, dizziness, or loss of consciousness following a known or unknown allergic trigger.
An epinephrine auto-injector (EpiPen) was used, as immediate emergency follow-up care is always required afterward.

These could be signs of a serious complication like anaphylaxis, which needs urgent care.

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How is the Diagnosis of Allergies Performed?

Diagnosing allergies typically involves a combination of medical history, physical examination, and specific tests.

Medical History and Physical Examination

Your healthcare provider will ask about your symptoms, family history of allergies, and potential triggers. A physical examination can help identify signs of an allergic reaction.

Skin Prick Test

In a skin prick test, small amounts of potential allergens are introduced into the skin using a tiny needle. If you're allergic to a substance, a small raised bump (hive) will appear at the test site.

Blood Tests

Blood tests, such as the ImmunoCAP test, measure the amount of IgE antibodies in your bloodstream. High levels of IgE can indicate an allergic reaction.

Elimination Diet

For food allergies, an elimination diet may be recommended. This involves removing suspected allergens from your diet and gradually reintroducing them to identify the culprit.

What Are the Treatment Options for Allergies?

Treatment for allergies can range from avoiding allergens to taking medications.

Avoidance

The most effective way to manage allergies is to avoid exposure to known allergens. This can involve lifestyle modifications, such as using air purifiers, regularly cleaning your living space, and avoiding certain foods.

Medications

Several medications can help control allergy symptoms:

Antihistamines: These drugs block histamine, a chemical released during an allergic reaction. They can help reduce sneezing, itching, and runny nose.
Decongestants: These medications relieve nasal congestion and are often used in combination with antihistamines.
Corticosteroids: These can reduce inflammation and are available in various forms, including nasal sprays, inhalers, and creams.
Leukotriene Modifiers: These drugs block the action of leukotrienes, chemicals that cause allergy symptoms.

Immunotherapy

Immunotherapy involves gradually exposing the body to increasing amounts of the allergen to build tolerance. This can be done through allergy shots or sublingual tablets. Immunotherapy can be especially effective for pollen, dust mite, and insect venom allergies.

Emergency Epinephrine

For severe allergic reactions, carrying an epinephrine auto-injector (such as an EpiPen) is essential. Epinephrine can quickly reverse the symptoms of anaphylaxis and save lives.

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How to Prevent Allergies?

Preventing allergies involves reducing exposure to allergens and taking proactive steps to strengthen the immune system.

Environmental Control

Keep windows closed during high pollen seasons.
Use air purifiers to reduce indoor allergens.
Clean regularly to minimize dust mites and pet dander.
Wash bedding in hot water weekly to kill dust mites.

Dietary Adjustments

For those with food allergies, reading labels carefully and avoiding cross-contamination is crucial. Introducing allergenic foods to infants early, under a doctor's supervision, may help prevent the development of food allergies.

Strengthening the Immune System

Maintain a healthy diet rich in fruits and vegetables.
Exercise regularly to boost overall health.
Manage stress, as it can weaken the immune system.

Frequently Asked Questions

1. What are the symptoms of allergies?

Symptoms include sneezing, runny nose, itchy eyes, rash, and difficulty breathing, depending on the allergen.

2. What causes allergies?

Allergies occur when the immune system overreacts to harmless substances like pollen, dust, pet dander, or certain foods, releasing chemicals like histamines.

3. How are allergies treated?

Treatment includes antihistamines, decongestants, allergy shots (immunotherapy), and avoiding known allergens. Severe cases may require emergency epinephrine.