According to The University of Maryland Medical Center, food allergies are defined as the body's immune system reacting to generally harmless substances in certain foods. Most food allergies are a result of a genetic predisposition to sensitivity to a certain food item, and allergies normally resolve in adulthood.

A common symptom of food allergies is sinus problems. The sinuses are cavities in your head, located directly behind your nose and eyes that help to filter unwanted particles from the air you breathe in. They are made of sensitive soft tissue and lined with mucus membranes that keep the tissue soft and moist.

There are some foods that contain the properties found in the antihistamine medication you might be familiar with from chemists and pharmacists.

Lip and eye swelling, along with hives, form as the result of an allergic reaction to a substance with which you have come into contact. For some, this swelling does not present a medical emergency, although it should be examined.

Although honey is often used as natural treatment for a variety of ailments, some individuals can develop an allergic reaction to it.

Some of the more commonly experienced symptoms of allergies to latex condoms are usually mild. However, repeated exposure to latex--if you are allergic--can lead to a severe and sometimes fatal reaction.

If you use dye to color your hair, you might be among the 5 percent of people that develop an allergy to the product. ParaPhenyleneDiamine, or PPD, is found in most commercially produced hair dyes, as is peroxide.

If you have allergies, you know it is not unusual for those allergies to affect your eyes. The eyes can become red and itchy, and the skin around the eyes can become puffy. This eyelid swelling, along with other allergy symptoms, can be treated by identifying the cause of the allergic response and limiting exposure.

A peanut allergy can cause a chronic cough only if you continue to eat products that contain peanuts. Coughing is a common symptom of a peanut allergy, but will only continue as long as you consume peanuts.

It is possible for you to be allergic to almost anything, including toothpaste. Allergies to a toothpaste tend to be specific to the mouth, including severely dry and chapped lips and sores. You also can experience general allergy symptoms from a toothpaste.

Seafood allergies are the most common food allergies They occur when someone’s immune system mistakenly interprets proteins contained in fish such as anchovies as a harmful substance, according to The Online Allergist, a website written and edited by Board-certified allergists.

Disposable diapers are a convenience for most parents, but a few babies are allergic to them. Yeast infections, diaper rashes and food sensitivities may cause symptoms that resemble an allergic reaction, so it's important for parents to know the symptoms of a diaper allergy.