Pathophysiology (a.k.a. physiopathology) – a convergence
of pathology with physiology – is the study of the disordered physiological
processes that cause, result from, or are otherwise associated with a disease
or injury. Pathology is the medical discipline that describes conditions
typically observed during a disease state, whereas physiology is the biological
discipline that describes processes or mechanisms operating within an organism.
Pathology describes the abnormal or undesired condition, whereas
pathophysiology seeks to explain the functional changes that are occurring
within an individual due to a disease or pathologic state.