This thesis explores the therapeutic applications of cannabis from multiple perspectives. It begins with a historical overview of how cannabis was used in ancient medicine and how it became illegal in the 20th century. Then, it explains the pharmacological mechanisms behind cannabinoids and its interaction with the human body. The paper also reviews the current medical evidence for using cannabis to treat various conditions, including chronic pain, neurological disorders, and rare forms of epilepsies. Finally, possible side effects, contraindications, and legal issues are discussed.