Haemophilia, or hemophilia, 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. Those with a mild case of the disease may have symptoms only after an accident or during surgery. Bleeding into a joint can result in permanent damage while bleeding in the brain can result in long term headaches, seizures, or a decreased level of consciousness.

पैतृक रक्तस्राव या हीमोफिलिया (Haemophilia) एक आनुवांशिक (hereditary) विकार है जो आमतौर पर पुरुषों को होती है और औरतों द्वारा फैलती (transmit) है।