In　this　survey,　we　review　the　current　research　on　Wireless　Body　Area　Sensor　Networks　(WBASNs).　This　technology　is　playing　key　role　in　different　aspects　of　life　such　as　entertainment,　emergency　services,　sports　and　medical　health　care　applications.　We　identify　the　issues　of　WBASNs　for　medical　and　health　care　services.　Different　techniques　and　several　algorithms　are　designed　to　handle　the　problems　of　energy　consumption,　delay　and　route　selection　in　WBASNs.　This　study　also　discusses　how　different　algorithms　use　different　techniques　to　minimize　energy　consumption,　delay,　path　selection　cost　and　computational　complexity.　A　detailed　hierarchy　of　existing　algorithms　is　included　in　this　work　to　better　understand　the　emerging　issues　in　WBASN.　MATLAB　simulations　for　different　algorithms　are　performed　to　analyze　the　path　loss　and　energy　consumption　of　disconnected　nodes.　We　also　check　the　connectivity　between　employ　nodes　and　out　body　server　on　LOS　and　NLOS　due　to　frequent　human　body　movements.　We　see　some　connections　break　due　to　absorption　of　cloths　and　human　body,　and　also　take　time　to　setup　a　connection,　which　causes　delay　and　energy　utilization.　From　this　study　we　found　that　the　algorithms　designed　to　tackle　the　problem　of　emergency　should　be　priority-base,　thermal-aware　and　easily　manage　its　energy　range　for　sending　data　when　disconnection　occurs　due　to　partitioning.