Mercury rules 12th and 3rd house is in 1st house in Cancer
A person with Jyotish Mercury in the 1st house in the Cancer sign would be very intuitive and responsive to their environment. They would be very imaginative and sensitive, with a keen ability to understand the emotions of others. They are likely to be great communicators, conveying messages and ideas in a very emotionally-driven way. They would also possess a strong desire for intellectual stimulation and learning, and may excel in writing, teaching, or public speaking. However, they may struggle with indecisiveness due to their emotional nature, and their communication may become excessively emotional sometimes. They may also struggle with being overly critical of themselves and are prone to inconsistency in their thoughts and actions.