A system (100) detects hazardous situations in a medical setting. A sensor unit (110) has optical sensors (112) to determine a sensor signal (114), and to output same in real time, which includes sensor data indicating a sequence of three-dimensional views of a monitored area (102) over a monitoring time. A processor unit (12) identifies a number of objects (122) to be protected based on the three-dimensional views, detects hazardous objects (124) based on the three-dimensional views, determines a number of object pairs (105), monitors positions of the protected objects and hazardous objects of the object pair over the monitoring time, assigns hazard values to the object pairs, calculates current hazard values for object pairs up to a current time over an analysis time interval and outputs a corresponding alarm signal (126) if a calculated hazard exceeds a threshold value. An output unit (130) triggers an alarm.