Haemophilia is a bleeding disorder in which the proteins required for blood to clot are partly or completely missing. As a result, people with haemophilia bleed for longer than average. They bruise easily after minor knocks and bumps, and internal bleeding can also occur into joints, muscles and soft tissues. People with severe haemophilia may experience spontaneous bleeding. Untreated, these bleeds can be very serious, causing acute pain and potentially disabling joint damage.
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UK/WB/0813/0019(2) April 2016