A Manglik Dosha is that astrological condition where the birth of a native takes place when the planet Mars is placed in the 1st, 2nd, 4th, 7th, 8th or 12th house. Here, the rising sign or the Ascendant is taken as the first house.

What are its Effects?
This condition is considered to be among the most feared astrological condition since it is believed to impact a person’s marital life. Depending on several factors, its negative impact on one’s marriage can lead to divorce, disharmony and sometimes even premature death.
Why Does the Manglik Dosh Impact one's Marriage?
According to the Indian Vedic Astrology, Mars a planet plays a crucial role in determining the future of one’s marriage. Mars is considered to be a very negative planet and if placed in the wrong house can lead to hazardous consequences.
The Mangal Dosha which is also known as the Kuja Dosha can not only cause a delay in one’s marriage, but it is also believed that it can impact the success of a marriage, health and happiness of the union. On the other hand, if a native that is affected with this dosh marries another manglik, it is believed to nullify the negative effects, and the couple can lead an extremely normal life.
Are there Exceptions to the Mangal Dosh?
According to the principals of Vedic Astrology, there are a couple of remedies that can help overcome the negative effects of this condition-
Before you jump to any major conclusions about the prospects of your marriage, be sure to consult an experienced astrologer.