In Vedic astrology, the placement of Mercury in 12th House for Cancer Ascendant or Lagna is an interesting combination. In this placement, Mercury is considered to be in its own mooltrikona state which suggests a strong placement, and it can influence many areas of life.
Mercury as the ruler of the 3rd house and 12th house respectively emphasizes communication with siblings, networking, neighbors, and foreign lands. A person with this placement may be highly curious about new cultures and environments. They may have a deeper understanding of the inner workings of their family or feel drawn to learning spiritual subjects.
The aspect on the 6th house by Mercury may suggest that one can achieve success through hard work and determinism. They are likely to excel in their career due to their quick thinking ability, creative ideas, good organizational abilities, and excellent public relations skills.
The natural karaka of Mercury is home life (4th) and career (10th), which would also be influenced by this placement. There could be chances that natives might face obstacles in achieving their professional goals even after having excellent technical knowledge required for a job due to overly critical thoughts leading to self-doubt.
However despite any challenges met on the career front people with this placement might hold some constructive partnerships or associations behind the scenes shaping up behind them at a subtle level aiding them in materializing their objectives.
One possible challenge from mercury’s position here would include overthinking critical situations bringing out unnecessary negativity from oneself at times affecting decision-making abilities adversely impacting personal relationships or friendships around them if not monitored well.
Furthermore moon being ascendant sign lord placed in sixth house having supportive aspects with mercury possibly indicate overall an unbiased mind-set towards reaching desired goals overcoming obstacles faced while maintaining emotional balance provided they keep working on keeping clear lines of communications while keeping egos aside when making choices that affect others purposely or mistakenly creating useless frictions and mishaps.
Being a planet of intellect and communication, Mercury’s placement is related to the way one thinks and speaks. With this configuration, the individual is likely to ponder over spiritual or religious concepts from foreign lands or seek counsel when stuck in life problems.
Summarily, overall effects from Mercury’s placement in 12th house for cancer ascendant people would heavily rely on their shrewdness in communicating with various people across borders, diligence and impartiality towards work-related matters with open-mindedness towards varied groups of individuals furthered by good luck with prevailing astrological strengths enabling them to look out for early warning signals thus maintaining perfect balance between materialism/mysticism throughout their journey called life.