Hemophilia is known as a bleeding disorder because in this disease the blood doesn't clot due to lack of a clotting factor. It is hereditary in nature meaning the disorder runs in the families. Hemophiliacs (people born with the disease) produce little or no clotting factor due to the presence of a defective gene in chromosome X. Blood clotting here s what you need to know? Clotting factors are proteins that play a key role in the normal clotting of the blood. When injured these proteins along with platelets (present in blood) form a meshwork which in turn stops bleeding.