Hives
Hives is a harmless skin condition that is caused by an increased blood flow and fluid in the dermis,
resulting in the appearance of red raised areas on the skin. Hives may vary from a few millimeters to
several centimeters in diameter and can appear anywhere on the body. The most common causes of
hives are a result of allergic reactions, stress, viral infections, and physical irritation.
In the example of an allergic reaction, an allergy occurs when the body reacts to foreign particles it can't
tolerate. Allergens are normally harmless, but the immune system of a person with allergies views them
as harmful.
Following the body’s first contact with an allergen, white blood cells produce antibodies that prepare the
immune system for the same allergen the next time it enters the body. Antibodies attach themselves to
mast cells. Later contact with even a small amount of the allergen triggers the mast cells to release
histamine. When histamine is released, it attaches to nearby cells and causes blood vessels to dilate and
release fluids, creating the appearance of hives. Regardless of the cause, all hives are a result of
histamine release.
Symptoms commonly associated with hives include: - Itching - Stinging - Burning
Individual hives generally last two to twenty four hours. Treatments such as antihistamines and applying
cool compresses may be used to reduce symptoms.
Although there is no test available to determine the exact cause of hives, allergy skin tests may be performed to
determine allergens to which you are allergic.