Mercury in the twelfth house makes the mind hidden, intuitive and not always comfortable for public display. A person may have deep thoughts, unusual views and subtle observation, but not rush to say it aloud. It is easier to think in silence, read, write for oneself and study complex things in solitude.
In a strong expression this is a psychological, imaginative and attentive mind. The person sees background motives, hidden causes of actions, changes of mood, lies and omissions. Psychology, philosophy, religion, medicine, alternative healing, esotericism, foreign languages and literature may interest them.

