An allergy occurs because the body produces antibodies, called immunoglobulin E, which cause the allergy cells in the body to release histamine and other chemicals in the blood to fight the perceived invader. The chemicals released in the blood cause the symptoms in the body that people recognize as an allergic reaction. One symptom -- itching -- can occur in several areas of the body, including the skin, eyes and mouth. The best way to relieve itching associated with an allergy depends on the cause and severity of the reaction.
Food Allergies
A food allergy occurs when specific foods trigger an immune response in the body. The offending food causes the body to make antibodies to the food. Common foods that cause allergies include peanuts, eggs, milk, shellfish and wheat. Possible symptoms of a food allergy include itchy hives; areas of scaly, itchy skin that can peel; and itching of the lips, tongue, throat, eyes or mouth. The first course of treating a food allergy includes avoiding all contact with the food. To treat the itching associated with the allergy, apply a skin cream, such as an over-the-counter hydrocortisone medication, or take an antihistamine to ease the discomfort. Serious symptoms associated with peanut and other allergies, such as breathing difficulties, require immediate medical attention.
Contact Dermatitis
Contact dermatitis is a rash that occurs after a substance damages the skin after contact. The degree of response may depend on the length of time the substance touches the skin or the strength of the substance. Soaps, items with fragrance, nickel, dye and laundry detergent are possible causes of contact dermatitis. The rash may itch, and cause the skin to redden and blister, similar to a poison ivy allergy. A cold compress can relieve itching. Use a topical hydrocortisone cream to help decrease the inflammation and itching associated with the condition. Avoid the substance that causes the rash to reduce episodes. Allergy testing can help determine the cause of the contact dermatitis, if necessary.
Allergy Eye
Seasonal allergies are often the cause of itchy eyes. Take oral antihistamine medications or use allergy-specific eye drops. Over-the-counter eye drops contain antihistamine medications to help control the symptoms, such as redness, excessive tearing and itching. Some sufferers may require stronger prescription eye drops to control eye allergy symptoms. The itching should stop after using the drops.
Hives
Some allergic conditions can cause hives. Hives, also referred to as urticaria, are reddened, raised welts that may have a pale center. Hives can change in shape and size, and cause pain or itching. Although hives themselves do not require treatment, taking an oral antihistamine medication can help relieve the itching associated with the condition.
