As a Jyotish astrologer, I can tell you that having retrograde Mercury in the 3rd house in the Virgo sign can have both positive and negative effects on an individual's life. Let me explain:

Positive Effects:
- This placement can enhance communication skills, making the person very articulate and convincing in their speech.
- The individual may have a keen eye for detail and be adept at analysis and problem-solving.
- There is a possibility of having a good relationship with siblings, neighbors, and colleagues.

Negative Effects:
- Retrograde Mercury can cast a shadow on communication skills, causing misunderstandings or conflicts in conversations.
- The tendency to overthink and worry can lead to anxiety and stress-related issues.
- The person may face challenges in developing and maintaining relationships due to a tendency to get caught up in details.

In general, it is important to remember that astrology is not deterministic, and while planetary positions can influence one's life, they do not control it. It is our choices and actions that ultimately determine our future.

retrograde Mercury rules 12th and 3rd house is in 3rd house in Virgo