The study of the causes and origins of diseases, conditions, or problems; the reason why something happens or exists.
From Greek aitia (αἰτία) meaning 'cause' combined with -logia (study of). The term entered medical terminology in the 17th century and is fundamental to modern medicine.
Aetiology is why modern medicine is so effective—instead of just treating symptoms with leeches and prayers, doctors now trace diseases back to their actual causes like bacteria, viruses, or genetic mutations, which lets them prevent them.
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