Haemophilia: When you can't stop bleeding

Stopping the flow: Blood contains 13 clotting factors that work to stop bleeding in the body. - AFP

Haemophilia is a group of hereditary genetic disorders that impair the body’s ability to control blood clotting or coagulation.

MY nephew recently had a swelling of his right knee after a fall during football practice. At first, we thought the swelling was due to the knee injury. But when the swelling did not subside, we took him to a doctor. After a series of tests, he was diagnosed with haemophilia. What is this?