Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hereditary hemorrhagic telangiectasia ?
    ### Response:
    Hereditary hemorrhagic telangiectasia (HHT) is an inherited disorder of the blood vessels that can cause excessive bleeding. People with this condition can develop abnormal blood vessels called arteriovenous malformations (AVMs) in several areas of the body.
    