- Definition: Allergy-Triggered Asthma
- Definition: Allergen
- What's the Difference Between a Food Allergy and a Food Intolerance?
- How Do Doctors Test for Allergies?
- How Do Doctors Test for Food Allergies?
- Managing Asthma
- Do Allergies Cause Asthma?
- Asthma Special Needs Factsheet
- Asthma: Exercise-Induced Asthma Special Needs Factsheet
- Asthma and Sports Special Needs Factsheet
- First Aid: Allergic Reactions
- Five Ways to Prepare for an Allergy Emergency
- Food Allergies Special Needs Factsheet
- All About Allergies
- Bug Bites and Stings
From Nemours' KidsHealth
Trusted External Resources
What's the Difference Between a Food Allergy and a Food Intolerance?
What is the difference between food allergies and food intolerances?
- Intolerances, such as lactose intolerance and celiac disease, can cause someone to feel ill.
- Food allergies not only can make someone feel ill, but also can cause a life-threatening reaction (called anaphylaxis).
A food intolerance means either the body cannot properly digest the food that is eaten, or that a particular food might irritate the digestive system. Symptoms of food intolerance can include nausea, gas, cramps, abdominal pain, diarrhea, irritability, nervousness, or headaches.
A food allergy happens when the body's immune system, which normally fights infections, sees the food as an invader. This leads to an allergic reaction — a response from the immune system in which chemicals like histamine are released in the body. The reaction can cause symptoms like breathing problems, throat tightness, hoarseness, coughing, vomiting, abdominal pain, hives, swelling, or a drop in blood pressure.
Even if previous reactions have been mild, someone with a food allergy is always at risk of the next reaction being life-threatening. Eating a microscopic amount of the food, or sometimes even touching or inhaling it, could lead to anaphylaxis. So anyone with a food allergy must avoid the problem food(s) entirely and always carry emergency injectable epinephrine.
Many people with food sensitivities, on the other hand, can ingest a small amount of the bothersome food without a problem.
Reviewed by: Larissa Hirsch, MD
Date reviewed: September 26, 2016