This CPD Module will outline the definitions and presentation of the overarching typology of acute and chronic (or persistent) non-malignant and malignant pain, describe the anatomy and physiology relating to pain and review the pharmacology of pain medication in the UK for children and adults. This CPD module is advisory and does not seek to replace any locally agreed policies/procedures within your organisation or national policies and guidelines related to pain management. This module aims to provide you with a background to pain, its various types, some pain assessment tools and the pharmacological action of the common analgesic agents, and therefore a greater understanding of managing patients presenting in pain, their presenting symptoms and underlying pathology.