Apathy and depression can be very difficult to distinguish. Apathy is the loss of drive or motivation to do the things you once loved to do even when you don’t feel sad or numb. Typically, an individual with apathy will enjoy himself once he gets started with an activity. Depression, on the other hand, involves a sad, irritable, or numb mood that makes an individual feel as if it is not worth the effort or would not be enjoyable to do once-loved activities. Learn more about apathy and depression in Parkinson’s here.