Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Takayasu arteritis ?
    ### Response:
    Takayasu arteritis is a condition that causes inflammation of the main blood vessel that carries blood from the heart to the rest of the body (aorta) and its associated branched blood vessels. As a result of the inflammation, the blood vessel walls become thick and make it difficult for blood to flow.
    