The Internet of Medical Things (IoMT) is changing the way modern healthcare works through real-time monitoring, remote diagnostics, and data-driven decision-making. Increased interconnectivity, however, also raises substantial security issues concerning data privacy, authentication, access control, interoperability, and scalability. The use of blockchain technology stands out as a possible fix as it provides decentralized tamper-proof, and cryptographic security features. This paper sheds light on the main security issues in IoMT and examines how blockchain-based answers can tackle risks with unauthorized access, data breach, and system weak points. A comprehensive review of existing literature has brought to light blockchain frameworks tailored to IoMT security concerns. These frameworks focus on authentication methods, privacy protection through encryption, and safe data transfer. Even with these steps forward several factors hold back the widespread use of blockchain in IoMT. These include problems with scaling up high computing needs following regulations, and working with other systems. The study also points out some gaps and possible future paths such as streamlined blockchain models improved consensus methods, and advanced cryptographic techniques to boost privacy. To overcome these hurdles will help blockchain grow into a more effective and scalable security framework for future IoMT environments.