Haemophilia is a genetic disorder in which the blood does not clot properly resulting in excessive bleeding after any injury. The blood’s ability to form clots is required by the body to halt bleeding in case of any blood vessel breaking. This disorder is inherited in most cases. There are two chief classifications of haemophilia – haemophilia A and haemophilia B. Haemophilia A is caused because of the deficiency in a clotting factor called clotting factor VIII. This is the most predominant type with a prevalence rate of 1 in 5000-10000 male births. Haemophilia B is caused because of the deficiency in clotting factor IX. Its prevalence rate is 1 in 20000-34000 male births. There is another type of haemophilia known as haemophilia C. This is a rarer mild form of the disorder caused due to the deficiency of clotting factor XI. Affecting both sexes, it is commonly seen among Ashkenazy Jews and seldom found in other population groups.