Unani, Ayurveda, and Homeopathy are all traditional systems of medicine practiced in various parts of the world. Unani is based on the belief that health results from the balance of four elements in the body: air, water, earth, and fire. Ayurveda is based on the belief that health results from the balance of three principles in the body: Vata, Pitta, and Kapha. Homeopathy is based on the belief that like cures like; a substance that causes symptoms when taken in large doses can be used to cure similar symptoms when taken in small doses. The difference between these systems is that Unani and Ayurveda are both based on the principle of balance, while homeopathy is based on the principle of similarity.