Pathophysiology is the study of functional changes in the body that occur as a result of disease or injury. It bridges the gap between basic sciences and clinical medicine by explaining how diseases develop and progress.
Health is a state of complete physical, mental, and social well-being, whereas disease is a deviation from normal physiological function.
Etiology refers to the cause of disease. Diseases may be caused by genetic factors, infections, environmental factors, nutritional deficiencies, or lifestyle habits.
Pathogenesis describes the sequence of events from the initial cause of a disease to the development of clinical manifestations.
Morphological changes refer to structural alterations in cells or tissues that occur due to disease. These changes can be observed microscopically or macroscopically.
Clinical manifestations include the signs and symptoms produced by a disease. Signs are objective findings, while symptoms are subjective experiences reported by the patient.
Complications are secondary problems that arise during the course of a disease. Sequelae are residual effects that remain after the acute phase of illness has resolved.
Understanding pathophysiology helps pharmacists to select appropriate drug therapy, understand disease progression, and counsel patients effectively.