Communication plays a crucial role in the intensive care unit. Posttraumatic stress syndromes develop in a significant number of patients and their relatives after being in an intensive care unit. The syndromes may persist for several years. Regular open and empathic communication with patients and family members reduces the frequency and severity of the disease. Among the physicians and nurses in the intensive care unit, there is a high prevalence of burnout syndrome. The precipitating factors are mostly conflicts within the working staff, work overload and end-of-life situations. Working team communication reduces the rate of exhaustion syndromes. Rounds of discussions among the work groups are the basis for a healthy team structure. Inadequate communication, e.g., during emergencies or shift change, endangers the safety of patients and in the worst case, results in treatment mistakes. Measures for improved communication in the intensive care unit should always be implemented.