Pathophysiology is a branch of medicine and biology that studies the origin, development and outcome of pathological processes; features and dynamic nature of the modification of physiological functions in various pathological conditions of the organism.

Pathophysiology seeks to explain the functional changes that are occurring within an individual due to a disease or pathologic state.

Pathophysiology can also mean the functional changes associated with or resulting from disease or injury.

And finally, pathopgysiology bridges the gap between basic medical sciences and clinical training by discussing the picture of disease as physiologic dysfunction