Introduction: The incorporation of IoT in smart technology or wearable devices is accelerating presently. This uprising has reshaped the healthcare, medical, fitness, sports, and gadgets industry. The wearable devices empowered by IoT help to assemble, disseminate, and investigate by ameliorating the performance, efficacy, and productiveness. Objective: The major goal of advancing wearable devices is to know how IoT technology can advance performance. It helps to announce updated health, prevent medicine, and enhance data virtualization. An IoT ecosystem is a matrix of tools and applications that, after incorporating with medical devices, continuously observe blood oxygen level, heart rate, blood pressure, and walking step. Methodology: The Role of IoT in wearable devices pertains to a structural, comprehensive approach that amalgamates development, exploration, and mobilization of devices and smack to on the health. Future trends and challenges: IoT-incorporated wearable devices are worldly enlightened providing real-time health monitoring to the patient or consumer by an advanced sensors, multipara meter monitoring, and cloud system. There are some challenges in this technology like data interpretation, data mapping, formatting, and relatable and effective results. Conclusion: In conclusion, role of IoT in wearable devices made changes in individual toward their health. People are now more focused and eager or curious about their health or body function. IoT have the capabilities to enhance personal health, and preventing care helps with disease detection in the early stages. This abstract focused on the role of IoT in smart technologies and wearable devices smash on health management and transfigure healthcare delivery.