Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hypotension ?
    ### Response:
    Hypotension (HI-po-TEN-shun) is abnormally low blood pressure. Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps out blood.
                
Blood pressure is measured as systolic (sis-TOL-ik) and diastolic (di-a-STOL-ik) pressures.
    