Siddha medicine is an ancient medical system that originated over 10,000 years ago in South India, attributed to the sage Agasthya. It shares basic concepts with Ayurveda but emphasizes different dominant qualities at various life stages, recognizing seven key elements that contribute to psychological functions. Treatments utilize minerals, vegetables, and animal products, and are classified into divine, rational, and surgical methods, providing cures for chronic ailments without side effects.