Editing Haemophilia (section)

===Classification===
There are several types of haemophilia: [[haemophilia A]], [[haemophilia B]], [[haemophilia C]], ''parahaemophilia'', ''acquired haemophilia A'', and ''acquired haemophilia B''.<ref>{{cite web|title=What Is Hemophilia? – NHLBI, NIH|url=http://www.nhlbi.nih.gov/health/health-topics/topics/hemophilia|website=www.nhlbi.nih.gov|access-date=21 June 2016|url-status=live|archive-url=https://web.archive.org/web/20160702224149/http://www.nhlbi.nih.gov/health/health-topics/topics/hemophilia/|archive-date=2 July 2016}}</ref><ref name="nlm.nih.gov">{{Cite web|url=https://www.nlm.nih.gov/medlineplus/ency/article/000538.htm|title=Hemophilia A: MedlinePlus Medical Encyclopedia|website=www.nlm.nih.gov|access-date=21 June 2016|url-status=live|archive-url=https://web.archive.org/web/20160705052319/https://www.nlm.nih.gov/medlineplus/ency/article/000538.htm|archive-date=5 July 2016}}</ref><ref name="eMed HemC"/><ref>{{Cite journal|last1=Páramo|first1=Laura|last2=Enciso Olivera|first2=Leonardo Jose|last3=Noreña|first3=Ivan|last4=Amaya|first4=María A.|last5=Santacruz|first5=Juan C.|date=5 March 2019|title=First Case of Acquired Hemophilia B in a Patient with HIV Infection: Case Report and Literature Review|journal=Cureus|volume=11|issue=3|pages=e4179|doi=10.7759/cureus.4179|doi-access=free |pmc=6504016|pmid=31106079}}</ref>

Haemophilia A is a recessive X-linked genetic disorder resulting in a deficiency of functional clotting Factor VIII.<ref name="nlm.nih.gov"/> Haemophilia B is also a recessive X-linked genetic disorder involving a lack of functional clotting Factor IX.<ref>{{MedlinePlusEncyclopedia|000539|Hemophilia B}}</ref> Haemophilia C is an [[Autosome|autosomal]] genetic disorder involving a lack of functional clotting [[Factor XI]]. Haemophilia C is not completely recessive, as [[heterozygous]] individuals also show increased bleeding.<ref name="eMed HemC">{{EMedicine|article|955690|Hemophilia C}}</ref>

The type of haemophilia known as ''parahaemophilia'' is a mild and rare form and is due to a deficiency in [[factor V]]. This type can be inherited or [[acquired characteristic|acquired]].<ref name=Thal2013/>

A non-genetic form of haemophilia is caused by [[autoantibody|autoantibodies]] against factor VIII and so is known as ''acquired haemophilia A''.<ref name=Mul2014/> It is a rare but potentially life-threatening bleeding disorder caused by the development of autoantibodies (inhibitors) directed against plasma coagulation factors.<ref>{{cite journal |last1=Tribuzi |first1=Susanna |last2=Naccarato |first2=Alessia |last3=Pelagalli |first3=Lorella |display-authors=etal |title=Acquired Hemophilia A After Hepatic Yttrium-90 Radioembolization: A Case Report |journal=A&A Case Reports |volume=9 |issue=12 |pages=344–5 |date=2017 |doi=10.1213/XAA.0000000000000611 |pmid=28767473 }}</ref> Acquired haemophilia can be associated with cancers, autoimmune disorders and following childbirth.<ref name=Franchini13/>