A food-related allergic reaction usually occurs anywhere from a few minutes to a few hours after eating the problem food. These reactions can range from mild to severe and potentially life-threatening anaphylactic shock. Symptoms may involve the eyes, nose, throat, skin, respiratory system and digestive system.

Mild to moderate symptoms of an allergic food reaction may include:

• Skin conditions, including hives and rashes of raised bumps
• Itchy or watery eyes
• Runny nose or nasal congestion
• Swelling, commonly around the lips and mouth
• Itching or tingling in the tongue and lips
• Hoarseness
• Wheezing
• Abdominal cramps
• Nausea or vomiting
• Diarrhea

Mild to moderate symptoms may progress rapidly to more severe symptoms. Therefore, people having any kind of food reaction should seek immediate medical attention to prevent anaphylactic shock. It is also possible for severe symptoms to appear even when mild to moderate symptoms are not present. Signs and symptoms of a more severe reaction include:

• Difficulty breathing
• Shortness of breath
• Tightness in the chest or throat
• Choking
• Drop in blood pressure
• Rapid pulse
• Dizziness or lightheadedness 
• Fainting

People who suspect a food allergy should consult an allergist/immunologist.