Food allergies are among the most dangerous, which is why it's important to understand the symptoms of a food allergy. As with other types of allergies, you experience a reaction when your body's immune system responds incorrectly to a particular food or a particular ingredient within a food. The most common food allergies are nuts, milk, shellfish, wheat, soy, and eggs.

The most common symptoms of a food allergy include irritation of the skin which may involve hives, eczema, and a simple rash. In more severe cases, symptoms may also include swelling of the tongue, lips, throat, face and other body parts, abdominal pains, vomiting, diarrhea, nausea, lightheadedness, and tingling inside the mouth.

The following symptoms are often more difficult to directly associate with a food allergy because there could be numerous other reasons for these symptoms. However, in those situations where these become persistent you should definitely visit with your physician and see if you can isolate what's going on ...

- Trouble Sleeping

- Moodiness

- Fatigue

- Heartburn

- Constipation

- Symptoms Similar To Those of Arthritis

- Canker Sores

- Bed Wetting

- Inflammation Of The Face And Lips

- Rhinitis

- Migraine

- Wheezing

Eczema or atopic dermatitis, which is a swelling and drying of the skin, can be seen in allergies to citrus fruits, eggs, and tomatoes. Hives or urticaria is also a form of skin irritation which is represented by elevated skin welts that are reddish. Hives are a common reaction to tomatoes, eggs, shellfish, mangoes, pork meat, nuts, and strawberries.

Simple headaches are usually symptoms of an allergic reaction to chocolates and wheat. Migraines, on the other hand, are typically caused by an allergy to cheese, nuts, citrus fruits, tomatoes, milk, eggs, and MSG or monosodium glutamate. Monosodium glutamate is a chemical used for seasonings in a lot of foods but only those which have excessive amounts can cause allergic reactions.

In severe conditions known as anaphylaxis, can result in life-threatening symptoms such as rapid pulse, loss of consciousness; airway constrictions that lead to loss of breathe and shock with a significant drop in the blood pressure levels. When any of these symptoms occur, immediate medical attention is required.

As mentioned, food allergy symptoms are not unique. Therefore, when these symptoms do appear it can be difficult to know if they're related an allergy or if there's another cause. Even if you're able to identify a symptom as belonging to an allergy, you'll also need to determine if food is the culprit or if there's another allergen involved.

There is one consideration that can help ... did you eat recently? If so, what did you eat? Mild food allergy symptoms often appear within minutes of consuming the food allergen (severe cases of a food allergy will result in an almost instantaneous reaction). So if you're experiencing a reaction, simply think back to your last meal. Of course, the trigger could be hidden within a food item, a hidden ingredient that you may overlook. For example, a peanut sauce may not readily identifiable.

Once you have a clear understanding of the potential symptoms of a food allergy, not only will you know what to be watching for, you'll be prepared to help your physician or allergist further define those foods that are troubling for you.