Physician-supervised blinded oral food challenge: This is the most scientific method to diagnose a food allergy accurately. Food diary: The person writes down everything they eat and describes symptoms if they occur. Blood test: This test looks for the presence of antibodies that are specific to certain food proteins and can indicate an allergy. People may need to repeat this test several times. 
Any reaction, such as itching, swelling, or redness, indicates that the person may have an allergy.
Skin prick test: A healthcare professional places diluted foods onto the person’s arm and lightly pierces the skin. The following tests can help the doctor diagnose a food allergy: The doctor will also be interested in any other existing allergies, such as seasonal allergies or asthma, and the person’s family history of allergies. how long it takes for the reaction to begin. To diagnose an allergy, the doctor will ask the person about their reactions to the food. rapid swelling of the throat, lips, face, and mouth. itchy skin, or a rash that may spread rapidly and cover much of the body. respiratory problems, such as wheezing or shortness of breath, which often become progressively worse. 
The signs and symptoms usually come on quickly and worsen rapidly. It usually occurs soon after exposure to the specific allergen but can occasionally take a few hours to develop.
burning sensation in the lips and mouthĪnaphylaxis is a severe and systemic allergic reaction.However, common signs and symptoms include: Not every person will experience all of the possible symptoms, and each reaction may be slightly different. Symptoms can range from mild to severe and affect each individual differently. Share on Pinterest Akchamczuk/Getty Images
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