Symptoms of Food Allergies
Food allergy symptoms can differ from person to person and range from mild to severe and potentially fatal. They can also change for one person over time.
Symptoms, which usually appear within a few minutes to two hours after eating the problem food, can include:
- Abdominal cramps or diarrhea
- Itching or tingling in the mouth
- Itchy skin
- Large, itchy bumps on the skin (hives)
- Swelling of the tongue, lips, or throat
- Wheezing, coughing, or difficulty breathing
- Vomiting
In some people, food allergies can cause anaphylaxis, which triggers the release of a flood of chemicals that can cause someone to go into shock.
Signs of anaphylactic shock include:
- Low blood pressure
- Nausea and vomiting
- Skin rash
- Trouble breathing
- Quick, weak pulse
Diagnosing Food Allergies
Because these symptoms may have other causes and not all symptoms that occur after eating are due to food allergy, it’s important to see an experienced allergist for a proper diagnosis.
At UT Southwestern, we begin with a thorough evaluation, which includes a:
- Detailed review of symptoms suspected to represent allergy and detailed dietary history
- Discussion of personal and family medical history
- Discussion of any associated atopic conditions (nasal allergies, asthma, eczema, etc.)
- Physical exam
If our immunologist suspects a food allergy, we may perform:
- Blood tests: We’ll measure a blood sample for IgE (allergy-related antibodies) against specific food allergens.
- Skin prick tests: Liquid extracts of food allergens are placed on the patient’s forearm or back, and the skin is pricked; if reddish, raised wheals appear, the patient might be sensitized to that food.
Depending on the results of those tests, we may recommend a food challenge, during which the patient eats incremental amounts of the potential food allergen while being monitored by the doctor.
Treatment for Food Allergies
The most effective treatment is avoiding the problem food.
When patients do come in contact with a problem food, it may require:
- Minor allergic reactions: Over-the-counter or prescribed antihistamines to help ease symptoms
- Severe allergic reactions: Emergency injection of epinephrine (through an EpiPen, for example) and an emergency room visit
Dietitians play an essential role in managing food allergies, and we work closely with them
at our clinics. We also collaborate with a psychologist who specializes in helping children who have anxiety related to food allergies such as EoE.
Clinical Trials for Food Allergies
As an academic medical institution, UT Southwestern is at the forefront of research for food allergy treatment.
Current clinical trials include:
- The OUtMATCH Study: Our researchers are trying to determine if a study medication called omalizumab alone or combined with oral immunotherapy might help people with multiple food allergies.
See all food allergy clinical trials at UT Southwestern.