What is haemophilia? or define haemophilia. Is it life threatening.

Haemophilia is hereditary disease in which the blood does not clot. If there is an injury, more blood may be lost. Yes, hemophilia is life threatening. 

Hemophilia is caused by a mutation or change, in one of the genes, that provides instructions for making the clotting factor proteins needed to form a blood clot. This change or mutation can prevent the clotting protein from working properly or to be missing altogether. These genes are located on the X chromosome.

The three main forms of hemophilia include the following: Hemophilia A: Caused by a lack of the blood clotting factor VIII; approximately 85% of hemophiliacs have type A disease. Hemophilia B: Caused by a deficiency of factor IX. Hemophilia C: Some doctors use this term to refer to a lack of clotting factor XI.

There is currently no cure for hemophilia. Effective treatments do exist, but they are expensive and involve lifelong injections several times per week to prevent bleeding.