Wireless Body Area Networks (WBANs) provide well-organized communication solutions to the ubiquitous health care systems. Monitoring human health, tele-medicine, military, entertainments with human interaction and audio/video system-portability are some of the fields using WBANs. The miniaturized sensors are combined with the advanced Micro-Electro-Mechanical Systems (MEMS) technology to create a WBAN, which has the complete monitors on the patient health condition. This paper contains comprehensive information on the applications of WBANs which works on smart health care systems. We have highlighted a number of projects that provides WBANs an unremarkable enduring healthcare monitoring along with the updated condition of the patient to the health centre. Additionally, we have list many medical applications of a WBAN which has the capability of epileptic seizure warning, glucose monitoring, and cancer detection.