bìng​cóng​kǒu​rù

illness enters by the mouth

Senses

病从口入/ 病從口入 bìng​cóng​kǒu​rù illness enters by the mouth

(idiom) Illness is caused by what one eats, so one should be careful with diet; sometimes used figuratively to mean that a loose tongue causes trouble.

References

see 祸从口出/禍從口出 病从口入/病從口入