An important step toward improving privacy and security in Internet of Things (IoT) networks is the integration of blockchain technology. This chapter highlights how blockchain technology may improve security and privacy while presenting the fascinating connection between blockchain and IoT devices. The key components of blockchain technology are also discussed such as its robust cryptographic foundation, decentralized architecture, immutable ledger, and smart contract functionality. Additionally, we assessed the degree to which blockchain and IoT are linked to the security of private medical data. This chapter also offers a thorough examination of the challenges and problems that come with integrating blockchain technology into the present healthcare systems. It is necessary to conduct additional research to guarantee scalability, regulatory compliance, and smooth integration of blockchain technology with IoT devices in a secure healthcare setting. This chapter further outlines the limitations and gaps in the existing research as well as potential future directions.