Planets in houses · Dusthana
Mangal in the 12th house
Mars · Vyaya Bhava
Mangal is the karaka (significator) of energy, courage, siblings and property. The 12th house, called Vyaya Bhava, shows expenses, foreign lands and moksha. When Mangal sits here, these matters take on its colour.
In the 12th house a malefic can raise expenses, losses or sleep trouble, but also helps detachment and work abroad.
The 12th house is a dusthana (house of difficulty), so results here come through challenges and need conscious handling.
Mangal gives its best results here when it is exalted in Makara, in its own sign (Mesha and Vrishchika) or in a friendly sign, and when it is not combust.
Results are weaker if Mangal is debilitated in Karka, combust, or afflicted by malefics.
In transit (gochar)
When Mangal transits the 12th house counted from your Moon sign, the period traditionally needs more care.
A single placement is never read alone: sign, aspects, conjunctions, dasha and the whole chart change the outcome.