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  Parkinson’s disease affects approximately 1.5 million adults in the United States. Due to a deficiency in the chemical dopamine, which controls muscle coordination and movement, Parkinson’s disease most often affects motor skills and speech. People with Parkinson’s disease often experience difficulties with movement; many of them shake uncontrollably or go rigid. Balance is often …

  Mood disorder has become a bit of a generic term when discussing mental health. A person with any sort of emotional or psychological difficulty — generalized anxiety, obsessive compulsive disorder, phobias, etc. — may be described as having a “mood disorder.” But in reality, the term mood disorder refers to one of two specific …