Haemophilia is a bleeding disorder that slows the blood clotting process. Normally, when you cut yourself, substances in your blood known as clotting factors mix with blood cells called platelets to make your blood sticky and form a clot. This makes the bleeding stop eventually. People with haemophilia do not have as many clotting factors as they should have in their blood. This means they bleed for longer than usual. They experience prolonged bleeding or oozing following an injury, surgery, or having a tooth pulled.