Today’s Wireless Body Area Networks technology augmented the wireless sensors communication more smart in the e-health line. With this sensors deployment prominent body parameters simply monitored remotely and the corresponding data is stored and transmitted the same for treatment purpose to the e-healthcare destination. Primarily Wireless Body Area Networks health care service is deliberately used in telemedicine, mobile health, elderly care, to monitor the chronic diseases and in emergency cases- the medical rehabilitations provided immediately without delay to the respective patient by the medical professional through internet service. As the demand of Wireless Body Area Networks e-health service increases, its ability is further enhanced once it is provided with more security and privacy to the enabled user’s data with more integrity, confidentiality, availability features. Wireless Body Area Networks makes the people to improve their quality of life provided with affordable cost and flexibility in usage having minimum operation of events. Researcher’s shows an interest over the past years in e-health care services adaptability and concerns more on real-world complications. This survey paper mainly focuses on the conceptual structure of Wireless Body Area Networks communication, security and privacy issues, and allocated frequency bands.