A Mercury in the 8th house individual is acutely aware of the unconscious exchanges between people. They often have an acute sense of what goes on behind closed doors. There is also a deep, serious mentality; and perhaps even an unnerving curiosity about life and death issues. An awareness of another reality and hidden agendas is something they are usually interested in exploring. Mercury here loves to investigate the unknown and they’re extremely curious about what goes on under the surface of life, solving the great mysteries of our universe.
Mercury in the 8th house revels in discovering what is concealed. The more forbidden a subject, the more likely they will want to penetrate the matter in question. It may be macabre, perverse, or dark, but the mind is unflinching and undaunted by such studies. The individual is very resolute in their interests. In some cases, those with this placement have been involved in communication with the deceased, and subjects beyond the grave never seem to unnerve them.
Mercury in this position picks up the unspoken words of others and tends to miss nothing. Reading the subtle cues in the environment, they’re deeply attuned to everything hidden. If you verbally attack them, they have counter psychological missiles on hand to destroy and know how to be sarcastic or verbally wound. If they walked into a room of people gossiping and suddenly everyone shut up, they know exactly who they were talking about. Mercury in the 8th house has feelers for invisible information and secrets cannot be hidden for long.
On other matters involving the mind, they might enjoy sharing their ideas and perceptions with a partner and possess a fundamental curiosity about things, experiencing close emotional connections with others. Typically, bonds are formed with others through sharing personal secrets or talking about shared pain or trauma. However, they can go for long periods of silence, but if they have something to say they will get in touch. In communication and intimacy, they may seek to understand the deepest motivations of others through psychology. This may be a person who helps to talk people through disturbance and crisis, exploring the taboos of life in depth. Astrologer Sue Tompkins also links this placement to ‘heavy breathers ‘on the telephone and phone sex!
In general, they may be drawn towards extreme styles of speech, and always have something profound to say, teach or write. Mercury in the 8th house is talented at analyzing the exchanges between people. This is the mind of the detective, occultist or investigator with a deep desire to know as much as possible. Furthermore, they make perceptive, insightful and intuitive writers, and there could be an interest in sexuality, evolution, shared resources, finance, taxes, the occult, psychic activity, or death. In a few cases, it may indicate the death of a sibling, conflicts involving inheritance, or the unthinkable aspects of life.
Mercury in the 8th house has to be aware of a tendency to control others intellectually. The person may be prone to mental paranoia and a suspicious nature. Mercury here can be very secretive since the mind is very determined and unflinching; they need to communicate on a deep and meaningful level. This placement of Mercury might be associated with a black sense of humor and highly sophisticated one.