Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Coronary Microvascular Disease ?
    ### Response:
    Coronary microvascular disease (MVD) is heart disease that affects the tiny coronary (heart) arteries. In coronary MVD, the walls of the heart's tiny arteries are damaged or diseased.
                
Coronary MVD is different from traditional coronary heart disease (CHD), also called coronary artery disease.
    