It is a book of hospital medical emergencies created under the collaboration of doctors from various Spanish hospitals. It allows us to have quick access to issues of hospital and out-of-hospital medical emergencies for application in the medical practice of daily life of professionals dedicated to hospital emergencies, primary care and out-of-hospital emergencies. This APP is available for download on various electronic devices. It contains the main aspects of medical emergencies. It is updated continuously and online by various health professionals. This APP does not replace any health science treaty or medical guides of other authors or companies in the healthcare world