All about allergy

Hives and angioedema are reactions of the skin to the release of histamine or other chemicals into the blood. This is often, although not always, due to an allergic reaction.
There are many causes of hives and angioedema. At least half the time, the specific cause cannot be determined.
Some of the more common triggers are the following:
Infections such as viral illnesses, especially in children
Allergies to food, medications, cosmetics, soaps, and detergents
Insect stings and bites
Transfusions of blood or blood products
Emotional and physical stress
Physical agents such as sunlight, heat, cold, water, or pressure
Chronic hives is a case of hives that lasts longer than 6 weeks. This can happen to anyone, but it is most common in women aged 40-60 years. Chronic hives can last for months or even years, but this is unusual.
Risk factors for hives and angioedema include the following:
A previous case of hives or angioedema
A previous allergic reaction
Family members who have hives or angioedema

Allergy journal

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