Allergic Reactions

Signs and Symptoms of Anaphylaxis An allergic reaction usually happens within minutes after being exposed to an allergen, but sometimes it can take place several hours after exposure. A reaction can involve any of these symptoms, and a person could have one or more of these symptoms regardless of the allergen: Skin system: hives, swelling, itching, warmth, redness, rash Respiratory system (breathing): coughing, wheezing, shortness of breath, chest pain/tightness, throat tightness, hoarse voice, nasal congestion or hay fever-like symptoms (runny itchy nose and watery eyes, sneezing), trouble swallowing Gastrointestinal system (stomach): nausea, pain/cramps, vomiting, diarrhea Cardiovascular system (heart): pale/blue colour, weak pulse, passing out, dizzy/lightheaded, shock Other: anxiety, feeling of “impending doom”, headache, uterine cramps, metallic taste The most dangerous symptoms of an allergic reaction are: Trouble breathing caused by swelling of the airways (including a severe asthma attack for people who have asthma) A drop in blood pressure causing dizziness, light-headedness, feeling faint or weak, or passing out. Both can lead to death if untreated.
  • Food Allergens

    People can be allergic to any food, but some allergies are more common than others. The following foods are listed as Priority Allergens by Health Canada, and have specific labelling requirements established by Health Canada.

  • Non-Food Allergens

    Medication An allergy to medication happens when your immune system reacts to the drug. Any drug can cause a reaction. Insect allergy can start at any age in life. For these people, allergic reactions can be caused by exposure to latex products or inhaling airborne latex particles. SKIN ALLERGY: Bumps, itching, redness and other skin conditions are very common, and their cause may not be easily identifiable. Rashes can be caused by many things, including plants (poison ivy, for example),