Excessive mucus production and inflammation in the nasal passages, throat, or respiratory system, causing discharge and congestion.
From Greek 'katarrhoia' (a flowing down), combining 'kata-' (down) and 'rhein' (to flow). The term has been used since classical antiquity to describe nasal congestion and discharge.
The ancient Greeks had this disease name before they understood viruses or bacteria—they just observed stuff flowing down from the head, which is what 'catarrh' literally means, proving that careful observation can create useful medical terms even without modern science.
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