etiology

Etiology is the study of the causes or origins of diseases and abnormal conditions. Pathology, on the other hand, is a medical specialty focused on determining these causes and understanding the structural and functional changes that occur in disease.12

The search for disease causes dates back to antiquity, with early physicians like Hippocrates proposing that diseases stem from earthly influences rather than divine intervention. While exposure to a causative agent is necessary, the development of a disease (pathogenesis) also depends on host factors such as resistance, immunity, age, and nutritional state, as well as the agent's virulence and the level of exposure.3

Pathology has evolved significantly, moving from humoral theories to a cellular basis, with microscopic analysis of affected cells becoming crucial. The discovery of bacteria as disease agents by scientists like Louis Pasteur and Robert Koch further advanced understanding. Modern pathology relies heavily on laboratory analysis of various specimens, including biopsies, to diagnose diseases accurately.24