The Internet of Things (IoT) for smart healthcare is an emerging research area focused on enabling connected, intelligent, and patient-centered healthcare systems through wearable devices, medical sensors, and healthcare IoT platforms. Research papers in this domain explore applications such as remote patient monitoring, chronic disease management, real-time vital signs tracking, telemedicine, and personalized treatment planning. Key contributions include AI-driven analytics, edge/fog-assisted real-time processing, interoperability frameworks for heterogeneous medical devices, and secure, privacy-preserving data management. Recent studies also address challenges such as scalability, cybersecurity, data privacy, energy efficiency, and integration with electronic health records (EHRs) and cloud platforms. By combining IoT technologies with predictive modeling, telehealth services, and advanced analytics, research in IoT-smart healthcare aims to improve patient outcomes, enhance healthcare efficiency, and enable proactive, intelligent, and sustainable healthcare ecosystems.