Today's sedentary lifestyle can lead to chronic pain and stiffness in the neck, shoulders and back. But experts say treatment should go beyond these areas, because sometimes our discomfort is due to hidden causes. What's more, stiff shoulders can be a sign of a life-threatening illness, so the condition shouldn't be ignored. We'll take a close look at some surprising causes of stiff shoulders and treatment options. And we'll learn how to ease shoulder aches and pains with karate techniques.