Mars in the 8th house (Randhra / Ayus, the house of transformation) brings the significations of Mars, namely energy & courage, younger siblings, land & property, into the area of longevity, transformation, the occult and sudden change. The 8th house governs longevity & death, transformation & crisis, occult & mysteries, inheritance & joint finances.
Results of Mars in the 8th House
Mars is a malefic planet, so here it tends to bring anger, impulsiveness, accidents, conflict and disputes over property focused on longevity, transformation, the occult and sudden change. As the 8th is a dusthana (difficult) house, results may come through struggle before growth.The exact result depends on which sign Mars occupies here and the aspects it receives.
When It Activates
These results typically surface during the Vimshottari mahadasha or antardasha of Mars, and when transiting planets trigger the 8th house. A well-placed Mars here supports resilience, occult insight, inheritance and the power to be reborn through crisis; when afflicted it can indicate chronic obstacles, sudden upheavals, and anxieties about loss.