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Food Allergies - Topic Overview

This topic has general information about food allergies. If you would like more specific information about peanut allergy, see the topic Peanut Allergy.

When you have a food allergy, your body thinks certain foods are trying to harm you. Your body fights back by setting off an allergic reaction. In most cases, the symptoms are mild—a rash or an upset stomach. A mild reaction is no fun, but it isn't dangerous. A serious reaction can be deadly. But quick treatment can stop a dangerous reaction.

Allergies tend to run in families. You are more likely to have a food allergy if other people in your family have allergies like hay fever, asthma, or eczema (atopic dermatitis).

Food allergies are more common in children than in adults. Children sometimes outgrow their food allergies, especially allergies to milk, eggs, or soy. But if you develop a food allergy as an adult, you will most likely have it for life.

Food intolerances are much more common than food allergies. True food allergies are a reaction to food or food additives by your body's immune system.

Many people think they have a food allergy, but in fact they have a food intolerance. Food intolerance is much more common. It can cause some of the same symptoms as a mild food allergy, like an upset stomach. But a food intolerance does not cause an allergic reaction. A food intolerance can make you feel bad, but it is not dangerous. A serious food allergy can be dangerous.

Food allergies can cause many different symptoms. They can range from mild to serious. If you eat a food you are allergic to:

  • Your mouth may tingle, and your lips may swell as you start to eat the food.
  • You may have a stuffy nose, wheeze, or be short of breath when the allergens reach your mouth and lungs.
  • You may have cramps, an upset stomach, or diarrhea as the food is digested.
  • You may feel dizzy or lightheaded if your blood pressure drops as the allergens circulate through your bloodstream.
  • You may have itchy skin with red, raised bumps called hives camera.gif as the allergens reach your skin.
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