The study or explanation of causes and origins, especially of diseases or conditions in medicine.
From Greek 'aitia' (cause) and 'logia' (study). The term emerged in medical literature during the Renaissance when doctors began systematically investigating what caused illnesses rather than just treating symptoms.
Aitiology transformed medicine from guesswork into detective work—by asking 'why does this happen?' instead of just 'how do I fix it?', doctors could actually cure diseases rather than bandaging them.
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