Yoga provides a holistic approach to manage stress. It combines several stress management techniques such as breathing, meditation in addition to hatha yoga.
Stress is the byproduct of the present day competitive work environment and unhealthy life style.
A little bit of stress can be productive, and helps to perform better, however, too much stress over a prolonged period can be unhealthy for the mind and body.
Everyone reacts differently to stress depending upon the skills they have to handle the situation and how they perceive that particular stressful situation.