This visualization presents a hierarchical medical data tree that organizes disease-related concepts into 18 broad categories, such as treatment procedures, biological processes, and genetic topics. Users can click nodes to expand or collapse branches, navigating the structure while a side panel displays the clicked node's name and key. Built with D3.js v6 and React, the tree uses animated transitions to smoothly update node and link positions. Data is sourced from a remote JSON file and processed by a custom categorizer that assigns nodes to categories based on regex pattern matching.