Jesse Jackson revealed Friday that he's battling Parkinson's disease. The reverend added that he must now "make lifestyle changes" and dedicate himself to physical therapy. Parkinson's is a disease that can cause tremors, stiffness and difficulty balancing, walking and coordinating movement. Jackson noted in his statement that his father was "bested" by Parkinson's. Jackson, 76, is known for participating in civil rights demonstrations and still remains active in American life and politics.