病从口入，祸从口出
bìng cóng kǒu rù, huò cóng kǒu chū
In real, traceable use. Part of the curated seed collection; community review is coming.
Traditional: 病從口入，禍從口出
Careless eating makes you ill and careless talk gets you into trouble. A reminder to watch both what goes into your mouth and what comes out of it.
Bệnh theo miệng mà vào, hoạ từ miệng mà ra: ăn uống bừa bãi thì sinh bệnh, ăn nói bừa bãi thì rước hoạ. Lời nhắc phải cẩn thận cả khi ăn lẫn khi nói.
Register: neutral
Examples
Editorial example (illustrative, not a corpus attestation) — awaiting a native-speaker check
Sources & notes
Hán-Việt bridge batch 062 (2026-11-13). Headword, Traditional form and pinyin checked against CC-CEDICT (CC BY-SA 4.0) source ↗ · Hán-Việt reading: Unihan kVietnamese source ↗ · Vietnamese cognate: Idiomer entry “bệnh tòng khẩu nhập, hoạ tòng khẩu xuất” (benh-tong-khau-nhap-hoa-tong-khau-xuat). Definition, literal gloss and example sentence are original; the example has not had a native-speaker check yet.
Equivalents & related
Common questions
What does “病从口入，祸从口出” mean?
Careless eating makes you ill and careless talk gets you into trouble. A reminder to watch both what goes into your mouth and what comes out of it. Literally: illness enters by the mouth, disaster leaves by it
Is “病从口入，祸从口出” formal or informal?
病从口入，祸从口出 is generally neutral.