What does it mean to have 10th lord in 6th house?

As we know Sixth house is First of Dusthasthana Houses (houses ==> 6, 8 and 12) and Second of Upachaya Houses (houses ==> 3, 6, 10 and 11). It represents things like diseases, debts, obstacles, enemies, disputes, daily routine life, colleagues at workplace etc. One thing to remember here is that it is one of Upachaya Houses which improve with time. It means any planet in these houses improves in results with age and real good result is seen from a person’s 30s or 36s. Also, all the malefic planets provide very good results in Upachaya Houses but results may be seen in 30s or 36s.

The 10th House in Kundli is the Karma Bhava or Kirti Bhava, the house of social status and is related to the profession you are involved in. Studying this house can reveal your career path. This house naturally corresponds to Capricorn energy whose workaholic tendencies and ambitious goals are commonly known. 10th house represents things like Government, Father, Authority, Fame, Work Environment etc.

कर्मेशे रिपुभावस्थे पितृसौख्य विवर्जितः।

चतुरोअ्पि धनैहीनः शत्रुभिः परिपीडितः।।

So when 10th lord comes to 6th house it is 9 place from own house. Your work environment is going into dealing with disputes, obstacles and diseases. It doesn’t mean that you will yourself face many obstacles in getting your job done but it means that you may be a Lawyer or Doctor at your workplace and helping people with such issues.