Pneumonia has a huge impact upon the healthcare system in the UK and is not only associated with higher rates of hospital admissions than any other respiratory disease, but also carries a high risk of mortality. This article offers an overview of community-acquired pneumonia in adult patients, including the pathophysiology, common aetiologies, at-risk groups and pharmacological management. There is also a brief discussion on differential diagnoses and potential strategies to support clinical decision-making in the community.