The types of reactions to ultraviolet light are varied. In many disorders, ultraviolet light aggravates, but does not cause, the disease. Examples of this type of reaction include lupus erythematosus, porphyria cutanea tarda, dermatitis associated with niacin deficiency (pellagra), and recurrence of HSV. Other disorders are caused primarily by the sun. The most common is a sunburn reaction. Sunburn reaction, exogenously induced photosensitivity, and polymorphous light eruption are discussed here.

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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