Sun in the sixth house can give a strong drive to manage duties, face opposition and establish competence through difficult work. When the Sun and Lagna lord are supported, this can favor persistence in service or competition. A weak Sun with an afflicted sixth-house structure can instead show recurring disputes over authority or obligations that are hard to resolve.
Strength to face the sixth-house demand
Brihat Parashara Hora Shastra associates the sixth with illness, debts and opponents. It is both a difficult house and an upachaya, where effort has a role. A prominent sixth house can show substantial demands; compare it with Lagna and Lagna lord before concluding that the native has the capacity to overcome them. For a health-related interpretation, add relevant karakas and repeated chart support rather than naming a condition from the occupied house.
With Leo rising, the Sun carries the first house into the sixth. The native’s direction becomes closely involved with service or overcoming difficulties. A different ascendant changes the house responsibility brought by the Sun.
The Sun’s seventh aspect reaches the twelfth. A supported twelfth lord can make expenditure purposeful; a damaged one can turn a prolonged dispute into draining costs. Mars in the sixth addresses a more forceful response to these demands.
Sun in Libra requires checking its debilitation and supporting factors. The Sun is the reference for combustion, not itself combust. For a dispute judgment, examine relevant lords and periods: capacity to resist opposition and actually securing a favorable outcome are separate steps.