In Vedic astrology, Mercury governs our mind, logic, reasoning, business, trade, negotiation, communication, decision-making, non-spiritual knowledge, etc. A combust Mercury in Vedic astrology primarily affects the logic and reasoning abilities of the person.

Some of the impacts of a combust Mercury in Vedic astrology are:

• Difficulty in organizing one’s thoughts; thinking too many things leading to a state of perpetual confusion
• Poor negotiation skills; such a person cannot convince others easily and may be manipulated easily by others
• Poor decision-making skills – the person may end up taking a decision and then changing it later when others least expect them to. This causes them to be unreliable.
• Communication skills may be affected, because the person will not know what to say when and how, potentially hurting others’ feelings and sentiments and likely creating enemies
• Bad money management skills, as they person may end up taking too much risk or investing without proper research
• Understanding others becomes difficult if it involves logical aspects; a person with a combusted Mercury tends to be egoistic and may refuse to listen to others even if doing so would have been helpful for them
• Poor logical and reasoning skills which makes such individuals emotional and egoistic (as Sun’s influence combusts Mercury) due to which they may be difficult to understand.