Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Heart Failure ?
    ### Response:
    In heart failure, the heart cannot pump enough blood to meet the body's needs. In some cases, the heart cannot fill with enough blood. In other cases, the heart can't pump blood to the rest of the body with enough force. Some people have both problems. Heart failure develops over time as the pumping action of the heart gets weaker.
    