Hemophilia is a rare, genetic blood disorder that happens when your blood doesn’t clot and make your bleeding slow down or stop. Hemophilia happens when people don’t have the normal amount of clotting factors. Clotting factors help blood clot. Healthcare providers treat hemophilia by replacing missing clotting factors.

Hemophilia is usually an inherited bleeding disorder in which blood does not clot properly. This can lead to spontaneous bleeding (bleeding that occurs for no known reason) as well as bleeding following injuries or surgery. Blood contains many proteins called clotting factors that can help to stop bleeding.

Hemophilia refers to a group of inherited disorders that cause unusual bleeding. The bleeding happens because part of the blood -- the fluid part called plasma -- has too little of a protein that helps blood clot. Symptoms of hemophilia range from more than usual bleeding after trauma, injury, or surgery to sudden bleeding with no apparent cause.

Hemophilia is a hereditary bleeding disorder caused by a deficiency in one of two blood clotting factors: factor VIII or factor IX. Several different gene abnormalities can cause the disorder. People can bleed unexpectedly or after minor injuries. Blood tests are needed for diagnosis. Transfusions are given to replace missing clotting factors.

Haemophilia (British English), or hemophilia (American English) (from Ancient Greek αἷμα (haîma) 'blood' and φιλία (philía) 'love of'), is a mostly inherited genetic disorder that impairs the body's ability to make blood clots, a process needed to stop bleeding. This results in people bleeding for a longer time after an injury, easy bruising, and an increased risk of bleeding inside joints or the brain.