When The Shen is at home in your Heart, the Way is obvious. They effect the flow and rhythm of our organism by influencing the qi. The qi directly effects the organs. When emotions are intense, they effect our body in profound ways. The five emotions correspond to the five pair of organs and the five elements.
Strong emotions pervert the qi to create disease.
Fear or anger lead to constraint of qi, which results in depression, stagnation, and a multitude of physical ailments.