Haemophilia is a blood disorder. Normally, when bleeding starts, the blood clotting factors help to form a blood clot at the site of injury. A blood clot is a kind of patch that covers the hole and prevents any more blood from flowing out. At least 14 blood clotting factors have been identified. Each one is very important because they work like a team. If one of the factors does not do its job, the others do not work as well to form the blood clot that stops the bleeding.

What is Haemophilia?
To answer the question 'What is haemophilia?', we can say that it is a problem with the blood in which there is not enough of one of the blood clotting factors needed for blood clots to form.

The most common form of haemophilia is 'haemophilia A', which is a deficiency of blood clotting factor 8 (VIII). The next most common is 'haemophilia B', which is a deficiency of blood clotting factor 9 (IX).

For further information on haemophilia, you can visit The Haemophilia Society website for your country via the links below: