In medicine, an acute disease is a disease, a short course, or both.

Acute medicine is that part of internal medicine concerned with the immediate and early specialist management of adult patients with a wide range of medical conditions who present in hospital as emergencies. It developed in the United Kingdom in the early 2000s as a dedicated field of medicine, together with the establishment of acute medical units in numerous hospitals. Acute medicine is distinct from the broader field of emergency medicine, which is concerned with the management of all people attending the emergency department.