Hives on the skin, also called urticaria, appear as swollen, red or pale bumps on the skin. Hives can cause sensations such as itching, burning or stinging. They tend to come on abruptly and can develop on any area of the body. Hives appear when blood leaks out of small blood vessels in response to a trigger that causes a release of histamine. To help control this symptom, it is important to become familiar with the causes of hives, and to determine and avoid personal triggers.
Allergic Reactions
Hives can be triggered by an allergic reaction to food or medication, according to the American Academy of Allergy, Asthma & Immunology. Allergies to dust, pet hair and pollutants are other triggers. This reaction can be acute or short term and last just a few days. For some, the reaction is chronic and the hives last for months or years. In rare cases, the throat and tongue can swell and cause difficulty with breathing, which is a medical emergency. Different people have allergies to different substances and medications, so patients can work with a physician to determine personal triggers.
Other Skin Irritants
The American Academy of Dermatology claims that skin hives can also occur after exposure to sunlight, heat or cold. These cases of hives tend to resolve within hours after exposure. Hives can also appear after rubbing or scratching the skin and periods of wearing tight and restrictive clothing. For some, hives are a reaction to being in the water.
Exercise
According to the American College of Allergy, Asthma & Immunology, a rise in body temperature and sweating that occurs during exercise can cause hives in some people. Hot showers and using a jacuzzi can also trigger a similar reaction. Hives can occur while exercising or appear minutes or hours after stopping. In some cases, headaches and stomach cramps can accompany the hives.
