Public health monitoring system, which are an integral part of diseases monitoring system and policies formulation, progressively rely on complex networks to collect and analyze the data then make the public health statistics. These systems play an essential role in detecting diseases outbreaks, constraining spread directions, and formulating polices for the public health. This manuscript proposes development a continuous health monitoring system, which is designed to monitor the individual health cases in real time. Where, the system is used to securely transfer the participating individual's data to a medical server, to ease early detection of abnormal health cases. Firstly, the most important contribution of this manuscript is the recommendation to implement a continuous health monitoring system as a public health service. In order to improve the proposed system, experimental analysis are conducted to focus on improving network performance and reducing price. These analyses include assessing different network protocols and their configurations to specify the most effective and reliable method to transfer data. While the second contribution is to develop a new wearable device characterized by its lightweight design and low power consumption. This device considers as one of the basic components for the proposed system. It is provided by different sensors to monitor numerous of health conditions and is able to quickly switch between sleep and wake up modes to conserve energy. These features make the proposed device an effective tool in monitoring public health. Furthermore, this manuscript suggests a security model designed especially for wearable devices with constrain resources to meet a serious need in the age of digital information security. The suggested security model assurances the secure handling and transferring the sensitive health data, which is considered the most important demand of public health monitoring system.