Heavy metal rocker Ozzy Osbourne died at 76, just weeks after his farewell show and about five years after announcing he had Parkinson's disease.

Here's what to know about the disease:

What is Parkinson's?

Parkinson's is a neurologic disease that robs people of control over their movements. It typically starts with tremors and is characterized by slow movement, a shuffling gait, stiff limbs, balance problems and slurred speech.

Who gets it?

About 1 million Americans are living with Parkinson's, and 10 million people worldwide, the Parkinson's Foundation estimates. It usually appears after age 60, although sometimes it can develop before age 50.

What causes Parkinson's?

The exact cause isn't known, but Parkinson's develops when cells that produce one of the brain's chemical mes

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