Having any kind of food allergy can certainly crimp eating habits, but for most, it's something that is just dealt with without too many problems, especially when the allergy is developed at an early age.

A food allergy or any kind of food intolerance can be mild or severe, and many people are allergic to foods and don't even realize it. Mild symptoms like an upset stomach or heartburn is common after eating particular kinds of food, but most people don't equate such as an allergy. However, there's a difference between a food allergy and food intolerance, and the public in general should know what that is.

The body has an unusual response to an allergy that is caused by the body's immune system and comes with specific and sometimes extremely uncomfortable symptoms that occur within minutes of eating sensitive foods and include hives and rashes. A reaction may also induce asthma and weakness or lightheadedness, and in some cases, anaphylactic shock.

Excessive swelling in body tissues, including the larynx, which can cut off oxygen supply, causes this condition, and while most people don't suffer such severe reactions, many people allergic to nuts, especially peanut butter or shellfish can develop these symptoms. The sudden drop in blood pressure can be deadly.

Additional common symptoms also include itching and difficulty swallowing. Nausea, and on occasion, vomiting results, along with abdominal pain.

Food intolerance is not quite the same as a food allergy and is caused not by the immune system, but by other body systems. Symptoms of food intolerance may be gastrointestinal problems like diarrhea and stomach cramps. Many babies and young children are allergic to milk and soy products that can lead to colic and poor growth. Almost twenty percent of infantile colic, or chronic crying at night, may be due to those babies allergic to milk or soy products found in most powdered baby formulas.

The most common culprits in adults are shellfish, such as shrimp, crab and lobster, and nuts that grow on trees, like walnuts and acorns. Other foods like fish and some meat are also common allergy sources. Nuts, especially peanuts are to be blamed for more severe allergic reactions in many patients.

If you think you may be suffering from any type of food allergy, first try to limit your intake of such foods and see if that helps relieve symptoms. If you're not sure what is causing allergic symptoms, a visit to your doctor will more than likely initiate a series of skin-prick or scratch tests which will introduce particular food allergens in minute quantities into your skin to watch for local reactions.

While having a food allergy may at times put a damper on eating habits, millions of people around the world suffer from one sort of or another and lead perfectly happy, normal lives. Once you know what you're allergic to, just avoiding such foods may relieve symptoms of food allergy, and nothing more is necessary or required.