A 32-year-old Caucasian lady was admitted to hospital following a collapse at the gym. Her friends described the patient falling to the floor while exercising on the rowing machine, followed by twitching of her arms and legs and a period of being unrousable. You are the medic on duty... 100 Cases in Acute Medicine presents 100 acute conditions commonly seen by medical students and junior doctors in the emergency department, or on the ward or in the community setting. A succinct summary of the patient's history, examination and initial investigations, including photographs where relevant, is followed by questions on the diagnosis and management of each case. The answer includes a detailed discussion on each topic, with further illustration where appropriate, providing an essential revision aid as well as a practical guide for students and junior doctors. Making clinical decisions and choosing the best course of action is one of the most challenging and difficult parts of training to become a doctor. These cases will teach students and junior doctors to recognize important clinical symptoms and signs, and to develop their diagnostic and management skills.