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A. Hives (urticaria) are raised, red spots on the skin that often itch. Hives are usually indicative of an allergic reaction. Hives are a common reaction in people who have allergies. A number of substances can trigger an outbreak of hives, including foods, medications, pollen, animal dander, or insect bites. Hives can also develop as a result of sun or cold exposure, infections, excessive perspiration, and emotional stress. The reason why stress seems to precipitate an outbreak of hives in many people is not completely understood but is likely related to the known effects of stress on the immune system.
Some cases of hives can be attributed to the body's sensitivity to clothing or jewelry that fits too tightly against the skin. This can trigger the body's histamine response and result in hives. If any pressure at all causes you to break out in hives, however, you may suffer from a condition known as dermatographia..According to the National Institutes of Health, dermatographia is harmless, but even the slightest touch can cause the skin of dermatographia suffers to break out in hives.hoto Credit pollen image by asb from Fotolia.com. Allergies are a common cause of hives since an allergic reaction can trigger the immune system response that results in trapped fluid beneath the skin. An allergic reaction can occur due to something you ingested or were exposed to through the air.