Common allergens are substances that can trigger the immune system in some people, leading to symptoms that range from mild irritation to life-threatening anaphylaxis. This cheat sheet helps students recognize frequent food, insect, medication, latex, and environmental allergens. It also explains how to notice warning signs early and respond safely in school, sports, and social settings.
Knowing these basics can help students protect themselves and others.
Key Facts
- A food allergy can be triggered by a very small amount of an allergen, including traces from cross-contact on shared surfaces or utensils.
- Common food allergens include peanuts, tree nuts, milk, eggs, wheat, soy, fish, shellfish, and sesame.
- Common non-food allergens include pollen, dust mites, mold, animal dander, insect stings, latex, and certain medicines.
- Mild allergic reactions may include sneezing, itchy eyes, hives, rash, stomach discomfort, or a runny nose.
- Anaphylaxis warning signs include trouble breathing, swelling of the lips or tongue, tight throat, dizziness, fainting, widespread hives, or repeated vomiting.
- If anaphylaxis is suspected, use epinephrine if available and call emergency services immediately.
- Antihistamines may help some mild allergy symptoms, but they do not replace epinephrine for anaphylaxis.
- The best prevention rule is identify the allergen, avoid exposure, read labels, prevent cross-contact, and follow an allergy action plan.
Vocabulary
- Allergen
- An allergen is a substance that can cause an allergic reaction in a person whose immune system is sensitive to it.
- Allergic reaction
- An allergic reaction is the body’s immune response to an allergen, causing symptoms such as hives, swelling, sneezing, or breathing trouble.
- Anaphylaxis
- Anaphylaxis is a severe, fast-moving allergic reaction that can affect breathing, circulation, skin, or digestion and requires emergency treatment.
- Epinephrine
- Epinephrine is an emergency medicine used to treat anaphylaxis by helping open airways, support blood pressure, and slow the reaction.
- Cross-contact
- Cross-contact happens when an allergen is accidentally transferred to another food, surface, utensil, or person.
- Allergy action plan
- An allergy action plan is a written guide that explains a person’s allergens, symptoms to watch for, medicines, and emergency steps.
Common Mistakes to Avoid
- Assuming a small amount is always safe, which is wrong because even trace amounts can trigger a serious reaction in some people.
- Treating breathing trouble with only an antihistamine, which is wrong because anaphylaxis requires epinephrine and emergency medical care.
- Ignoring early symptoms after a known exposure, which is wrong because allergic reactions can worsen quickly and need monitoring.
- Sharing food without checking ingredients, which is wrong because hidden allergens and cross-contact can make foods unsafe.
- Thinking allergies are the same for everyone, which is wrong because triggers, symptom patterns, and emergency plans vary by person.
Practice Questions
- 1 A cafeteria table was used by 4 students eating peanut butter sandwiches, then 1 student with a peanut allergy sits there. What is one cross-contact risk and one prevention step?
- 2 A student has itchy hives on both arms 10 minutes after eating a cookie, then develops throat tightness 5 minutes later. How many minutes passed from eating the cookie to the throat symptom, and why is this serious?
- 3 A class trip has 28 students, and 3 students have food allergy action plans. What fraction of the students have action plans, and what should the teacher check before the trip?
- 4 Why is it important to believe someone who says they are having an allergic reaction, even if their symptoms are not visible at first?