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Wireless sensor networks have traditionally been used for military purposes but now its usage has widened in different areas of life including medical terms which are called wireless body area network (WBAN). WBAN is playing a vital role in every aspect of medical science for monitoring the continuous health of patients’ body without hindering the normal physiological activities in human body. All physiological data like a heartbeat, blood pressure and body temperature can be collected and then transferred to the data servers for further monitoring through WBAN. In this paper we will discuss about WBAN and some MAC protocols that has been designed to improve energy efficiency in WBAN