Recent technological advances in wireless communications and wireless sensor networks have enabled the design of intelligent, tiny, low-cost, and lightweight medical sensor nodes that can be placed on the human body strategically. The focus of this chapter is to implement the health monitoring system continuously without hospitalization using wearable sensors and create a wireless body area network (WBAN). Wearable sensors monitor the parameters of the human body like temperature, pressure, and heart beat by using sensors and providing real-time feedback to the user and medical staff and WBANs promise to revolutionize health monitoring. In this chapter, medical sensors are used to collect physiological data from patients and transmit it to the system which has details of an individual stored using Bluetooth/Wi-Fi with the help of Arduino and to medical server using Wi-Fi/3G communications.