Allergies can affect anyone, regardless of age, gender or race. Allergy symptoms may affect the nasal passages, eyes, skin, lungs, or digestive system. Itchy eyes, sneezing, stuffy nose, wheezing, and hives are common reactions to allergens. Although it's true that allergies are more commonly discovered while in childhood or adolescence, they can occur for the first time at any age. Sometimes allergy symptoms start in childhood, disappear for many years and then start up again during adult life. Sometimes, more dangerous whole-body reactions can occur which can cause severe hives, shortness of breath and throat-swelling.