Genetic disorder hht?

HHT: Hereditary hemorrhagic telangiectasia (hht) is characterized by the presence of multiple arteriovenous malformations (avms) that lack intervening capillaries and result in direct connections between arteries and veins. The most common manifestation is spontaneous and recurrent nosebleeds beginning on average at age 12 years. Approximately 25% of individuals with hht have GI bleeds (>50 years old).

HHT is genetic: Hht also known as hereditary hemorrhagic telangiectasia is a genetic condition that causes differences in how blood vessels are formed causing so-called arteriovenous malformations (avms) which on skin are called teleangiectasias, thus name of condition. Currently three genes are known to cause it. Nih site has good info: http://ghr.Nlm.Nih.Gov/condition/hereditary-hemorrhagic-telangiectasia.