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Morgellons Disease is often written off as a mental illness. Learn about the causes of the mysterious Morgellons Disease.

Learn about headaches from Discovery Health. Learn about facts, common causes, and treatment for headaches.

Yeast overgrowth may be a factor in several chronic conditions. Learn about the causes and treatment of yeast overgrowth.

Macrodontia causes teeth to grow abnormally large. Learn how macrodontia works and and the complications and care involved.

Personal watercraft destroying the environment is a cause for major concern. Learn about personal watercraft destroying the environment.

Reversing global warming is discussed in this article. Learn about reversing global warming.

Urinary tract infections include bladder, kidney, and yeast infections. Learn causes, symptoms, and treatment options for these infections.

Radiation sickness can be terrifying, painful and -- in some cases -- fatal. Learn about the causes and symptoms of radiation sickness.

Splinters are small things that can cause a lot of pain. But can a splinter actually kill you? Find out.

There's growing evidence that sound can cause a range of health problems. HowStuffWorks looks at the science.

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