Haemophilia is a rare condition that affects the blood’s ability to clot. It’s usually inherited, and most people who have it are male.
Normally, when you cut yourself, substances in the blood known as clotting factors combine with blood cells called platelets to make the blood sticky. This makes the bleeding stop eventually.
People with haemophilia don’t have as many clotting factors as there should be in the blood. This means they bleed for longer than usual.
The symptoms of haemophilia can be mild to severe, depending on the level of clotting factors you have. The main symptom is bleeding that doesn’t stop, also called prolonged bleeding.