If Mars (Mangal) is placed in anyone of 1st, 4th, 7th, 8th or 12th house in Rashi (natal) chart of a horoscope then it is known as Mars Dosha or Manglik. Following are the effects of Mars Dosha depending on its placement in the Dosha qualifying houses: 1st house: person becomes very aggressive, rude & arrogant, problems in the areas of house, vehicle, conflict in married life, delay in marriage, fear of accidents from fire, electricity, chemical4th house: problems related to house, vehicle, conflict in marriage, delay in marriage, unstable professional life, difference of opinion with ones father, loss of income sources7th house: conflict in marriage, delay in marriage, unstable professional life, difference of opinion with ones father, person becomes aggressive, rude & arrogant, unexpected expenses, loss of income8th house: fear of accident from fire, electricity, chemical, loss of income source, unexpected expenses, tension among siblings12th house: increased expenses & losses, tension among siblings, may cause digestive ailments, blood related issues