Translation guide
Describes the sensation or condition of having insufficient saliva, often due to thirst, nervousness, medication, or health issues. Japanese expressions range from casual thirst to formal medical terms.
Express that your mouth feels dry, usually from thirst or heat.
Literally 'throat is dry,' this is the most common way to say you're thirsty. It implies dry mouth as part of thirst.
喉が渇いたので、水をください。
I'm thirsty, so please give me some water.
Directly means 'mouth becomes dry.' Used for the physical sensation, not necessarily thirst.
緊張すると口が渇く。
My mouth gets dry when I'm nervous.
More formal, 'the inside of the mouth is dry.' Used in medical or descriptive contexts.
エアコンで口の中が乾燥している。
My mouth is dry from the air conditioning.
Refer to chronic dry mouth as a symptom or side effect.
Medical term for xerostomia. Used by doctors and in health contexts.
口腔乾燥症の治療法について教えてください。
Please tell me about treatments for dry mouth.
Loanword from English 'dry mouth.' Common in everyday conversation and health articles.
最近、ドライマウスが気になる。
Lately, I've been bothered by dry mouth.
Literally 'decreased saliva secretion.' Very technical, used in medical reports.
唾液分泌減少が口腔乾燥症の主な原因です。
Decreased saliva secretion is the main cause of dry mouth.
Describe dry mouth caused by anxiety or public speaking.
Same as above, but context makes it clear it's from nerves.
人前で話すと口が渇いてしまう。
My mouth gets dry when I speak in front of people.
Onomatopoeic expression for extreme dryness, like 'parched.' Vivid and colloquial.
緊張で口の中がカラカラになった。
I was so nervous my mouth went completely dry.
喉が渇いた (nodo ga kawaita) is the standard 'I'm thirsty' and implies dry mouth. 口が渇く (kuchi ga kawaku) specifically means the mouth feels dry, which can be from nerves, medication, or other causes, not just thirst. Use 喉が渇いた when you want a drink.
喉が渇いたから、お茶が飲みたい。
I'm thirsty, so I want to drink tea.
口が渇くけど、喉は渇いていない。
My mouth is dry, but I'm not thirsty.
The direct translation '乾いた口' (kawaita kuchi) is not natural as a standalone phrase. It might appear in descriptive sentences like '乾いた口を潤す' (to moisten a dry mouth), but for stating the condition, use the verb form 口が渇く or the medical terms.