Kuja / Mangala / Angaraka dosha is to be ascertained in the following manner.
From Lagna , chandra and shukra, kuja's position has to be examined.
The dosha from Chandra and Shukra is equal in strength. That from Lagna is two fold stronger than this.
Kuja placed in 1,2,4,5,7,8 and 12 causes this dosha. For a male native, kuja in 2,7,8 and for a female native kuja in 4,8,12 dosha is stronger.
Many remedies can be suggested for this. Also, matching of dosha in the charts of boy and girl can nullify the ill effects to a good extent.