Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Syncope ?
    ### Response:
    Syncope is a medical term used to describe a temporary loss of consciousness due to the sudden decline of blood flow to the brain. Syncope is commonly called fainting or passing out. If an individual is about to faint, he or she will feel dizzy, lightheaded, or nauseous and their field of vision may white out or black out.
    