Parkinson’s disease, which affects more than 10 million people worldwide, is a neurological disorder that occurs as a result of the death of nerve cells in the brain that produce dopamine. The loss of dopamine production in the brain can lead to tremors, balance problems, stiff facial expressions and muffled speech, among other things. How does Parkinson’s disease affect the body? The mind? How does having a progressive disease affect families? Listen to the stories of seven men and women with Parkinson’s disease.