Physical Medicine is relatively late addition to the different branches of modern medicine. It is called physical because it uses, along with other means of treatment like drugs and surgery – the physical agents like ultrasound , electric , heat , cold, mechanical force i.e exercise. It has come into existence after 2nd world war mainly to bring relief to post war injured. Over time it has taken a shape and still evolving like any branch of science . It is the most important knowledge to face the challenge of managing pain and rehabilitate persons with physical disability in this modern age.