It is connected to the planet Mars. Mars stands for ego, temperament, self-worth, and conflict. It is a hostile planet. You may be aggressive and violent if certain sections of your birth chart (kundali) are put there; this could potentially cause marital problems. Your horoscope will tell you if you are a Manglik or not. Your horoscope is based on the day, month, hour, and location of your birth.
Those who have the Mangal Dosh Puja in Ujjain feel that the Manglik influence significantly distorts the compatibility between the prospective bride and groom. There is a notion that if the Manglik first conducts a ritual called a Kumbh vivah, the negative effects of a single-Manglik marriage can be remedied.