Why Does the Body Develop Allergies? Exploring the Causes, Symptoms, and Treatment Options

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Have you ever experienced an itchy rash, sneezing fits, or watery eyes after coming in contact with a certain food, medication, or environmental trigger? If so, you may be one of the millions of people worldwide who suffer from allergies.

Allergies are a common health issue that affects people of all ages, races, and genders. They can be triggered by a wide range of allergens, such as pollen, pet dander, mold, dust mites, certain foods, and medications. When it enters the body, the immune system produces antibodies that recognize the allergen as a harmful invader and initiates an inflammatory response to neutralize it. This results in a wide range of symptoms, including itching, swelling, sneezing, coughing, and difficulty breathing.

They can significantly impact a person’s quality of life, leading to missed school or work days, reduced productivity, and decreased social interaction. The severity of the reaction can vary, with some people experiencing mild symptoms while others may have a life-threatening reaction.

Understanding Allergies

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Allergies are an immune response triggered by a substance that the body mistakenly perceives as harmful. This substance is called an allergen. When the body encounters it, it produces antibodies called Immunoglobulin E (IgE) that recognize and react. The next time the body encounters that allergen, the IgE antibodies trigger the release of histamine and other chemicals, leading to an allergic reaction.

Intolerances, on the other hand, do not involve the immune system. Instead, they are a result of the body’s inability to digest certain foods or substances. For example, lactose intolerance occurs when the body is unable to break down lactose, a sugar found in milk.

Sensitivities are similar to allergies in that they involve the immune system, but they do not involve IgE antibodies. Instead, they involve other types of immune responses that are not as severe as allergies.

Allergens can be found in various forms, including foods, medications, insect venom, and environmental triggers such as pollen, dust mites, and animal dander. Common food allergens include nuts, eggs, shellfish, milk, and soy. Medications that can cause allergic reactions include antibiotics, aspirin, and nonsteroidal anti-inflammatory drugs (NSAIDs).

The immune system is designed to protect the body against harmful substances, such as viruses and bacteria. However, in the case of allergies, the immune system mistakenly identifies a harmless substance as a threat and overreacts. This overreaction leads to the release of histamine and other chemicals, causing the symptoms associated with allergies.

Genetics play a role in the development of allergies. If one or both parents have allergies, there is an increased likelihood that their children will have allergies. However, the specific one that triggers an allergic reaction is not necessarily inherited.


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The ENT specialist in Singapore discuss the causes, symptoms and treatment options for allergies, so we learned from them that reactions can manifest in a variety of ways, depending on the type of it and the severity of the reaction. Common symptoms of allergies include sneezing, runny or stuffy nose, itchy and watery eyes, skin rashes, hives, swelling, and gastrointestinal problems such as vomiting and diarrhea.

Allergic reactions can be immediate or delayed. Immediate reactions occur within minutes of exposure and can be severe, sometimes leading to anaphylaxis. Delayed reactions occur several hours or days after exposure to an allergen and are typically milder.

Anaphylaxis is a severe allergic reaction that can be life-threatening if not treated promptly. Symptoms of anaphylaxis include difficulty breathing, wheezing, rapid heartbeat, low blood pressure, and loss of consciousness. Anaphylaxis requires immediate medical attention, and the treatment involves epinephrine (adrenaline) injections to counteract the severe symptoms.

Treatment Options

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For mild to moderate allergic reactions, over-the-counter antihistamines and decongestants can help relieve symptoms such as itching, sneezing, and nasal congestion. In severe cases, prescription-strength antihistamines, decongestants, and corticosteroids may be necessary to alleviate symptoms.

Allergen immunotherapy, also known as allergy shots, is a long-term treatment option that involves gradually increasing doses of the allergen to which a person is allergic. The goal of this treatment is to desensitize the immune system to the allergen, reducing the severity of allergic reactions over time. Allergen immunotherapy is particularly effective for people with inhalant allergies, such as allergies to pollen, dust mites, and pet dander.

Immunotherapy involves a series of injections given over several months or years, depending on the severity of the allergy. The injections contain small amounts of the allergen, and the dose is gradually increased over time. After the initial buildup phase, the person receives maintenance injections at longer intervals, typically once a month.

The expected outcome of allergen immunotherapy is a reduction in the severity and frequency of allergic reactions. For some people, allergen immunotherapy can completely eliminate their allergy symptoms.


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While there is no cure for allergies, there are steps people can take to prevent allergic reactions. Avoiding allergens is the most effective way to prevent allergic reactions. Here are some tips:

  • Food: Read food labels carefully and ask restaurant staff about the ingredients in meals.
  • Medication: Inform your healthcare provider about any previous allergic reactions to medications.
  • Insect venom: Avoid wearing perfumes and brightly colored clothing that attracts insects. Wear long-sleeved shirts and pants when spending time outside.
  • Inhalant: Keep indoor environments clean, use air purifiers, and avoid spending time outdoors during peak allergy season.


While allergies cannot be cured, they can be effectively managed with the right approach. Allergy medication, such as antihistamines, decongestants, and corticosteroids, can help alleviate symptoms like itching, sneezing, and congestion. Additionally, allergen immunotherapy, also known as allergy shots, can help retrain the immune system to become less sensitive to allergens over time. This therapy involves regular injections of small amounts of the allergen under the skin, gradually increasing the dose over time to help the body build immunity to the allergen.

Prevention is also crucial in managing allergies. Identifying and avoiding the specific allergen can help reduce the severity and frequency of allergic reactions. For example, those with pollen allergies can track pollen counts and limit outdoor activities when levels are high. Similarly, individuals with food allergies should read labels carefully and avoid cross-contamination when preparing or consuming food.