Generally, the areas affected are exposed skin not usually protected by clothing; however it can also occur in areas covered by clothing. Areas constantly<unk> bjected to the<unk> n's rays may only be slightly affected if at all. People with extreme cases will also have reactions to artificial light sources that emit a UV wavelength. Parts of the body only thinly covered can also potentially be<unk> bjected to an outbreak. Life with<unk>  can be difficult. Patients are<unk> bject to constant itching and pain, as within minutes of the initial exposure to UV radiation a rash will appear. The urticarial reaction begins in the form of pruritus, later progressing to erythema and edema in the exposed areas of the skin. If vast areas of the body are affected, the loss of fluid into the skin could lead to light-headedness, headache, nausea, and vomiting. Extremely rarely, patients have been reported to experience an increase in heart rate that can cause a stroke or heart attack due to the body cavity swelling. Other rare side effects can be bronchospasm and glucose instability issues. Also, if a large area of the body is<unk> ddenly exposed the person may be<unk> bject to an anaphylactic reaction. Once free of exposure, the rash will usually fade away within several hours; rare and extreme cases can take a day or two to normalize depending on severity of the reaction.
Solar urticaria
Cold urticaria
Heat urticaria
Aquagenic urticaria
Pressure urticaria
Cholinergic urticaria
Delayed pressure urticaria
Physical urticaria