Hemophilia is an inherited genetic disorder that is passed on from the mother. A mutation in the X-linked recessive chromosome causes this and since females possess two X-chromosomes and males possess one X and one Y-chromosome, a female with the mutation may not be affected. This is because the other X chromosome in the female will produce the clotting factors necessary for normal clotting.

A blood clot can be harmless or very serious depending on a lot of factors. If an internal blood clot is immobile and dissolves on its own you might not even know it existed, but if it starts moving towards vital organs like the heart, lungs, and brain, it can result in a very serious situation.