When Mangal Graha sits in the 1st, 4th, 7th, 8th, 12th house of the horoscope, it sees the seventh house of the Kundali highest degree of Manglik dosh is observed when Mars sits in the 1st and 7th house.
The seventh house is considered as the house of marriage or home of the life partner or the house of the spouse. As per Vedic astrology, the effect of Mars on the seventh house is not suitable for Marriage and married life. Mangal Graha is considered the most Malefic Planet or Papi Graha as far as the marriage of a person is found, and its placement in individual houses results in Mangalik dosh.
If a Manglik boy/girl is married to a Non-Manglik spouse, then the event of death or severe accidents have been witnessed by many couples which lead to death, permanent disability of the Non-Manglik spouse. Sun, Saturn, Rahu, and Ketu’s placement in the houses mentioned above also forms partial Manglik Dosh.