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Physical urticaria: Hives caused by direct physical stimulation of the skin -- for example, cold, heat, sun exposure, vibration, pressure, sweating, and exercise. The hives usually occur right where the skin was stimulated and rarely appear elsewhere. Most of the hives appear within one hour after exposure.
Causes. The welts that come with hives arise when certain cells release histamine and other chemicals into your bloodstream. Doctors often can't identify the reason for chronic hives or why acute hives sometimes turn into a long-term problem. The skin reaction may be triggered by: Pain medications; Insects or parasites; Infection; Scratching; Heat or cold; Stress
Hives are a rash that appears as an allergic reaction. Urticaria occurs when the body reacts to an allergen and releases histamine and other chemicals from under the surface of the skin. The histamine and chemicals cause inflammation and fluid to accumulate under the skin, causing wheals.
But for those who have chronic hives, or urticaria, the condition can seem relentless. “Chronic idiopathic hives are itchy red welts that persist for at least six weeks and have no known cause,” says Miriam Anand, MD, an allergist with Allergy Associates and Asthma in Tempe, Arizona.
In physical urticaria, the hives have a physical cause, such as exposure to heat, cold or pressure. Common triggers include: Rubbing or scratching. This is the most frequent cause of physical urticaria. Symptoms appear within a few minutes in the place that was rubbed or scratched and typically last less than an hour. Pressure or constriction.
Cause #1: Foods. Hives are most commonly caused by some type of allergy, and that means that they can be caused by eating foods. If you have eaten anything unfamiliar lately and are experiencing hives, it’s possible that you are experiencing an allergic reaction. Be cautious when eating foreign fruits and vegetables.