Because almost all nations have come into aging society, it has been much more important to provide systems approach on health care than ever. There are many studies on human body from the view points of diseases however health has not been clearly defined. It would be difficult to clarify the notion of health because of various concepts of values and some cultural issues. With regarding this situation, Systems Healthcare would be new study area considering human health and wellness based on sensing and information technology. There have been developed various smart devices and services to prevent diseases and to improve health based on sensory data to realize the condition of our health. Causality between lifestyle and vital signals plays a important role for realizing them. In this article, the notion of Systems Healthcare is proposed and discussed.