Homeopathy is a system of medicine based on the principle of “Let likes be cured by likes”, with determination of the appropriate medicine based on the patient’s unique presentation rather than a diagnostic name. The actions of the medicines are elucidated by testing (provings). The medicines are prepared in by the process of “potentization,” resulting in low doses, often containing only nanoparticles, which elicit profound effects in patients. Both acute and chronic diseases can be cured with homeopathy.