Generally most of the people born with one or more than one retrograde planets in their birth charts. Retrograde planets behave differently than direct planets. These people process information differently than those who have Mercury directly.
Mercury is that planet of rational thinking, communications, decision-making, computer, data, writing, information, and short distance travelling. When Mercury retrograde in birth chart then the person has some challenges in life related to self-expression, speech, writing, computers, transport, public speaking and anything related with communication. Mercury retrograde could be making some mistakes due to some misunderstandings run through in life. Some examples of a natal Mercury retrograde and afflicted with Saturn have difficulty in reading (dyslexia), stuttering, having a terror of public speaking, feeling like you are never ‘heard’, difficulty in speaking, and have a confusing mind. However, These people are good at reevaluating, rethinking, reflecting upon details of stuff related to Mercury. Their perceptions and ideas are often creative, bright and innovative. Their inner mental process is very powerful, highly intuitive, and imaginative.
We all have challenging aspects in our lives. The point of any challenging aspect of Mercury retrograde, is to work through it. Gradually improving and growing in that particular area. These are the general effects of Mercury retrograde where native needs to take precautions in his/her whole life.
The effects for retrograde Mercury in house:
First House: Mercury retrograde in the first house of self be suspicious of all communications. Check carefully about what you said was what got heard and vice versa. Your relationships with others will be off. Everyone appears to be behaving irrationally and your own self-expression seems abnormal. Your expression of communication with others may be misunderstood and you are not able to reflect who you are on the inside.
Second House: Mercury is the planet of communication the second house is the house of speech, family, and self worth. You need to be extra careful of what you say with your family members. There may be misunderstanding between you and them. The second house is related to personal finances. You require extra attention to avoid mistakes related to finance. If Mercury is placed with Rahu or Saturn it can give any speech problem e.g. stuttering or phobia in speaking.
Third House: Mercury retrograde in the third house of communication, efforts, skills talents, relationships with siblings, and neighbors. Mercury has a special affinity with the third house. So it being retrograde in this position can be aggravating everyday routine actions and they will tend to run into problems. It can give misunderstanding between siblings and neighbours. Your efforts and intentions will likely be misinterpreted by others.
Fourth house: Mercury retrograde in their fourth house of home life, mother, car, assets, comforts peace and security. Communications among those who share your home or with your mother will likely suffer. Miscommunication among family members. Having some old family issues which impact your mind and have harsh feelings for that. Often you think more about home security and comfort. These things come very late in life.
Fifth House: Mercury retrograde in the fifth house. The house of life that includes lovers, children, entertainment, creative projects, teachers, teachings, and speculation investment. You may face problems related to these things. There could be delays in communications and or misunderstandings with a lover or child or teacher and problem in study and learning. Problems in speculative business.
Sixth House: Mercury retrograde in the sixth house. The house of struggle and difficulties, health, disease, employment, and workplace. Poor communication and misunderstanding with co workers. If you get sick there is a higher likelihood of misdiagnosis and or misunderstanding with your health practitioner. You need to understand any problem correctly before seeking a solution.
Seventh House: Mercury retrograde in the seventh house. The house of partnership, marriage clients, and business partners. Communication is very important in relationships. Mercury retrograde in seventh creates some problems in seventh house things. This requires an extra effort to understand your spouse, client or business partner. Mercury is the planet of business transactions therefore business deals with distant customers or supplier purchases that require extra precautions.
Eight House: Mercury retrograde in the eighth house. The eighth house is the house of financial involvement with others and with your partner. You need to take extra care in finance dealings with partners and business. The eighth house is also scandal and humiliation and since Mercury is the planet of communication be extra careful of what you say or write since it could put you in an unpleasant situation.
Ninth House: Mercury retrograde in the ninth house of beliefs, religion, guru, long distance travel and higher studies. Communications with Guru or group will run into misunderstandings. Your good deeds may get misinterpreted or be unnoticed by others. Needs to extra precaution while travelling or long distance travelling.
Tenth House: Mercury retrograde in the 10th house. The house of public, your career, profession, business,and community involvement. Mercury retrograde making rational decisions, behaving abnormally in public or in a career place. This can be harmful to your status and position. It could delay success in your career and your work and it could also give different careers.
Eleventh House: Mercury retrograde in their 11th house of goals, ambitions, friends, associates, profits and rewards. You could be misunderstood between friends, social circle or misinterpretation of a communication with an associate profits. Delays in incomes, fulfilling your desires, goals, and ambitions.
Twelfth house: Mercury retrograde in their 12th houses of expense, loss, strangers, foreigners, dreams, subconscious mind and loss. Mercury retrograde in the 12th house can be problematic for unknown reasons. However in the area of introspection, dreams and meditation, Mercury retrograde can be beneficial since the planet of thinking encourages self-examination.
Retrograde planets also affect the house; the mercury rule in your birth chart e.g Aries ascendant; Mercury rules the 3rd and 6th house, therefore it also affects those houses as well.