what causes allergy

Allergies are essentially caused by the immune system’s overreaction to substances that are usually harmless. Common allergens include pollen, dust mites, pet dander, and certain foods. Genetics can certainly play a role in whether someone develops allergies, as they often run in families. However, environmental factors can trigger or exacerbate them. So, it’s not surprising that your son might suddenly develop new allergies, even to things he has tolerated in the past. Sometimes, a child can become sensitized after repeated exposure to an allergen. In your son’s case, it sounds like his symptoms could be due to environmental allergies, food allergies, or even a combination of both. An allergy test could be quite useful — it helps identify specific allergens that trigger his reactions. Skin prick or blood tests are commonly used to diagnose allergies, and they can guide you on what to potentially avoid. It’s not uncommon for antihistamines to have varying effectiveness, as they target the histamine pathway but might not fully control the symptoms, especially if exposure to the allergen continues. To address your son’s symptoms more comprehensively, you might want to consult with an allergist. They can offer a tailored management plan and determine if other treatments, such as nasal sprays or allergen immunotherapy, might be beneficial. In the meantime, try to monitor his environment and diet for any triggers. Keeping a diary noting when symptoms appear can be useful in identifying potential allergens. If any serious symptoms arise, such as difficulty breathing or swelling in the throat, seek medical attention immediately, as these could be signs of a severe allergic reaction which must be treated promptly.