Health Sciences are the group of disciplines of applied science dealing with human and animal health. There are two parts to Health Sciences: the study and research knowledge of health and the application of that knowledge to improve health, prevent and cure diseases, and understand how humans and animals function.
Research builds primarily on the basic sciences of biology, chemistry, and physics as well as a variety of multidisciplinary fields (for example medical sociology).
Other fields which made an exceptionally significant contribution to the health sciences include biochemistry, biotechnology, engineering, epidemiology, genetics, nursing, pharmacology, pharmacy, public health, psychology, physical therapy, and medicine.
The health sciences industry, a multi-billion dollar business, is a subset of the life sciences, medical care, and diagnosis industries.
Source Wiki: http://en.wikipedia.org/wiki/Health_science