Food Allergies
16 July 2025
Food allergies occur when your immune system mistakenly identifies a specific food as a threat. In an attempt to defend your body, it triggers a range of reactions like skin rashes, stomach discomfort, swelling, and trouble breathing. Unlike food intolerances, allergic responses can be immediate or delayed and may impact several body systems at once.The difference between a food allergy and food intolerance is important to understand. While a food allergy involves an immune response, food intolerance typically leads to issues such as bloating or abdominal pain a few hours after eating the problematic food, without involving the immune system.Symptoms of a food allergySymptoms of a food allergy may appear soon after consumption or even days later. They can affect various parts of the body simultaneously. Common signs include:•Dizziness or lightheadedness•Swollen lips, eyes, or face (angioedema)•Itchy skin or hives (raised rash)•Wheezing, coughing, or difficulty breathing•Sneezing, runny or blocked nose•Hoarseness or noisy breathing•Nausea or vomiting•Stomach cramps•DiarrheaCauses of food allergyFood allergies are the result of the immune system overreacting to proteins found in certain foods. Although the exact cause isn’t fully known, some foods are more likely to provoke an allergic reaction in susceptible individuals. These include:•Cow’s milk•Eggs•Peanuts, soybeans, peas, and chickpeas•Tree nuts like almonds, walnuts, hazelnuts, pecans, pistachios, Brazil nuts, and cashews•Shellfish such as prawns, crab, and lobster•WheatIn addition, foods like mustard, sesame seeds, celery, and lupin flour can also be allergens. Your risk increases slightly if you or close family members have other allergies, eczema, or asthma.What kind of testing do I need for a food allergy?To identify a food allergy, healthcare providers may recommend:•Skin prick test: A small amount of a suspected allergen is introduced to your skin to observe for a reaction.•Blood test: Your blood is analyzed for the presence of antibodies that respond to specific allergens.•Food challenge: Under medical supervision, small portions of a suspected allergen are consumed to monitor for a reaction.What are the complications of food allergies?One of the most dangerous outcomes of a food allergy is anaphylaxis — a severe and potentially life-threatening reaction. This may involve swelling of the airways, difficulty breathing or swallowing, vomiting, and a significant drop in blood pressure (anaphylactic shock). If not treated promptly, anaphylaxis can be fatal. Seek emergency medical attention or call 1-03 immediately if you experience swelling in the face, lips, or throat, trouble breathing, or faintness after eating.