Mercury in 7th house is the seven house, where it makes a person very business-minded, with good communicative skills with the opposite sex and partners in life & business.
Mercury in 7th house Marriage, legal partnership (also includes business partnership), rules fame of a person as its opposite of the 1 st house, self and 7thhouse is other people, house of masses, and it also involves sex and sexual relationship with the legal partner. (In Greek, they say 5th and 8th house rules sex, but that’s not correct, 5th house rules romance, and 8th house, well, we’ll get to that next.) This is also a death
inflicting house (Marka House): dealing with marriage and its issues every day can kill anyone.
The 7th house is opposite the 1st. The act of marriage takes us as far away as possible from who we are by ourselves: it is an agreement to live with, to accept, to love, and to support someone who may be totally different than yourself The marriage brings about relations with the in-laws and people in general. Marriage is also likely to bring travel, as at least part of the family is not under the same roof. The lower part of the belly (the region below the navel, according to Parashara) is next in line. This includes the large intestines and kidneys. Libra corresponds to the 7th house. Movable, ruled by Shukra (Venus), reinforces marriage, social interactions, and travel.
Mercury in 7th house person is intelligent because in order for anyone to have good communication, one needs to be intelligent. Mercury is also our
business and management skills due to his calculative and logical nature, and love for the marketplace.
Mercury in Vedic Astrology represents speech. It also governs the logical and intellectual side of the mind, the thinking process that precedes speech, and the ability to communicate and anything related to language, use of symbols, logic, information processing, and connecting with people or things. The influences on Mercury in the chart will determine the clarity of one's intellect and speech and the ability to communicate.
Note: The degree of auspiciousness and inauspiciousness will depend upon a complete analysis of the horoscope (birth-chart).