Body Area Networks (BAN) is a growing field for such applications like Health monitoring and health related issues. Recently, new standards and technologies have been proposed, like Bluetooth, ZigBee, Ultra Wide Band (UWB), ECMA 386, WiFi, LTE, etc, oriented to provide solutions to different problems and requirements arising from our current life style. This document presents a revision of the current developments in Body Area Networks from a research point of view, revising aspects of standardization, applications and future trends in this amazing field.