Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Primary orthostatic hypotension ?
    ### Response:
    Primary orthostatic hypotension is a rare type of orthostatic hypotension. It is not a disease per se, but a condition caused by several disorders that affect a specific part of the autonomic nervous system, such as multiple system atrophy, young-onset Parkinsons disease, pure autonomic failure, dopamine beta-hydroxylase deficiency, familial dysautonomia, and pure autonomic failure among others.
    