A medical mattress for determining a position and/or a change in position of a patient supported on the mattress is provided. The mattress includes a number of fluid channels that are distributed in a matrix, such that a first part of the fluid channels extends parallel to each other and a second part of the fluid channels extends parallel to each other. The first part is orthogonal to the second part. Each of the fluid channels at an output is connected to a respective fluid supply hose. The mattress also includes a fluid supply device that pumps fluid into the fluid channels via the fluid supply hoses, sensors for measuring flow parameters and/or flow change parameters in the fluid channels, and an evaluation unit for evaluation of the flow parameters and/or flow change parameters with respect to a position and/or change in position of the patient supported on the mattress.
