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Psoriasis: Test Your Knowledge

Psoriasis affects up to 7.5 million Americans, according to the National Institutes of Health. Psoriasis is more common in adults than children and affects males and females equally.

Psoriasis affects:

Recommended Related to Psoriasis

Seven Psoriasis Triggers

While the underlying cause of psoriasis stems from your body's immune system, certain triggers can make symptoms worse or cause flare-ups. These psoriasis triggers include: Cold and dry weather. Such weather can dry out your skin, which makes the chances of having a flare-up worse. In contrast, hot, sunny weather appears to help control the symptoms of psoriasis in most people. Stress. Having psoriasis can itself cause stress, and patients often report that outbreaks of symptoms...

Read the Seven Psoriasis Triggers article > >

  • 2% to 3% of people throughout the world
  • About 2.2% of people in the United States
  • Some cultures more than others. Worldwide, psoriasis is most common in Scandinavia and other parts of northern Europe. It appears to be far less common among Asians and is rare in Native Americans, according to the American Academy of Dermatology.

WebMD Medical Reference

Reviewed by Norman Levine, MD on October 31, 2012

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