The Internet of Things (IoT) is a smart, internet-connected, and omnipresent network. Healthcare is one of the most critical sectors that could benefit from IoT technology. In the medical sphere, the rise of the IoT transforms traditional healthcare services by encouraging technological, social, and economic factors. This study rigorously analyzes various aspects of the Internet of Healthcare Things (IoHT), such as networking terminology, enabling communication technologies, services, applications, implementation issues, research challenges, and security-related concerns. Communication techniques under licensed and unlicensed spectra are extensively investigated and compared on various identified parameters for short- and long-range connectivity. The aforementioned aspects thoroughly review the operational and implementation roles of enabling technology. Following a rigorous analysis, multiple research issues and challenges are identified and discussed, along with recommendations to address them. After that, several IoHT services and applications are highlighted and reviewed with a comparative analysis regarding enabling technologies. Additionally, essential security and privacy concerns, along with probable threats and attacks related to the Internet of Healthcare Things, are mentioned in this work. Finally, this paper also emphasizes the future directions of the IoHT domain.

物联网 (IoT) 是一个智能、互联网连接且无所不在的网络。医疗保健是可以从物联网技术中受益的最关键行业之一。在医疗领域，物联网的兴起通过鼓励技术、社会和经济因素改变了传统的医疗保健服务。这项研究严格分析了医疗保健物联网 (IoHT)的各个方面，例如网络术语、启用通信技术、服务、应用程序、实施问题、研究挑战和安全相关问题。对许可和非许可频谱下的通信技术进行了广泛的研究，并针对短程和远程连接的各种已确定的参数进行了比较。上述方面彻底审查了使能技术的操作和实施作用。经过严格的分析，确定并讨论了多个研究问题和挑战，并提出了解决这些问题的建议。之后，重点介绍并回顾了几种物联网服务和应用程序，并对支持技术进行了比较分析。此外，基本的安全和隐私问题，这项工作中提到了与医疗保健物联网相关的可能威胁和攻击。最后，本文还强调了IoHT领域的未来发展方向。