Etiology meaning
Etiology refers to the study or cause(s) of a disease or condition. In medicine, it answers the question: "What caused this?"
For example:
- The etiology of Type 1 diabetes is autoimmune destruction of pancreatic beta cells.
- The etiology of pneumonia may be bacterial, viral, or fungal.
The word comes from the Greek aitia (cause) + logos (study). It is used interchangeably with "cause" in clinical contexts, but technically refers to the broader study of causation - including predisposing factors, risk factors, and underlying mechanisms.
Pathogenesis meaning
Pathogenesis refers to the mechanism or sequence of events by which a disease develops and progresses. It answers the question: "How does this disease happen?"
It describes the biological processes that occur from the initial trigger (cause/etiology) through to the final signs and symptoms.
Simple comparison to clarify the difference:
| Term | Question it answers | Example (Tuberculosis) |
|---|---|---|
| Etiology | What caused it? | Mycobacterium tuberculosis infection |
| Pathogenesis | How did it develop? | Bacteria inhaled → phagocytosed by macrophages → granuloma formation → caseous necrosis → lung damage |
Key components of pathogenesis include:
- How the agent/trigger enters or affects the body
- Cellular and molecular changes that occur
- Inflammatory or immune responses triggered
- How tissue damage leads to symptoms
The word comes from Greek pathos (suffering/disease) + genesis (origin/development).
In short: etiology = the cause, pathogenesis = the process by which the cause produces disease.
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