Bleeding disorders are a group of conditions in which there is a problem with the body's blood clotting process. These disorders can lead to heavy and prolonged bleeding after an injury. Bleeding can also begin on its own.
Specific bleeding disorders include:
- Acquired platelet function defects
- Congenital platelet function defects
- Congenital protein C or S deficiency
- Disseminated intravascular coagulation (DIC)
- Factor II deficiency
- Factor V deficiency
- Factor VII deficiency
- Factor X deficiency
- Factor XII deficiency
- Glanzmann disease
- Hemophilia A
- Hemophilia B
- Hemophilia C (Factor XI deficiency)
- Idiopathic thrombocytopenic purpura (ITP)
- Von Willebrand's disease (types I, II, and III)
Normal blood clotting involves blood components called platelets and as many as 20 different plasma proteins. These are known as blood clotting or coagulation factors. These factors interact with other chemicals to form a substance called fibrin that stops bleeding.
Problems can occur when certain factors are low or missing. Bleeding problems can range from mild to severe.
Some bleeding disorders are present at birth and are passed through families (inherited). Others develop from:
- Illnesses such as vitamin K deficiency or severe liver disease
- Treatments such as the use of drugs to stop blood clots (anticoagulants) or the long-term use of antibiotics
Bleeding disorders can also result from a problem with the number or function of the blood cells that promote blood clotting (platelets). These disorders can also be either inherited or develop later (acquired). The side effects of certain drugs often lead to the acquired forms.