A battery free wearable sensing device with temperature and sweat sensors embedded into and powered by a smart textile NFC antenna available for both NFC readers and NFC enabled smart phones, which can take part in various medical applications such as daily healthcare, fever detection and wound healing monitoring. Take-Home Messages In this manuscript, body temperature and sweat sensors are integrated with a textile NFC antenna, which eliminates the need for external batteries and realizes real-time wireless monitoring. This paper has presented design, fabrication implementation, measurements and real-life applications of smart textile NFC antennas and a battery-free wireless NFC body temperature and sweat sensing device, aiming for truly ubiquitous wireless health and wellbeing monitoring. The proposed device targets at body temperature and sweat loss monitoring for daily healthcare, systemic hyperthermia from fever, sweating symptoms caused by various kinds of infection, inflammation and trauma and wound healing monitoring. Different from conventional battery enabled and wire connected sensors, the significance of this work is by applying textile NFC as a communication interface as well as a wireless power harvester, battery-free realtime body temperature and sweat monitoring has been realized simultaneously. Apart from the device itself, an App has also been developed on Android system for the sensor data to be accessed by smart phones.