By combining “speech” (话) with “disease” (痨), the word 话痨 creates a vivid, almost medical-sounding metaphor for an addiction to talking. It implies that the person's talkativeness is not just a personality trait but an uncontrollable, chronic condition, like a “talking sickness.”
The term 话痨 taps into a subtle cultural preference for measured and thoughtful speech in certain traditional contexts. While modern Chinese culture is vibrant and expressive, there's still an underlying value placed on not speaking excessively or needlessly. A 话痨 is someone who ignores these unwritten rules, filling the air with constant chatter.
话痨 is extremely common in daily, informal conversation. You will hear it among friends, family, and on social media, but almost never in a formal or professional setting.