Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Monoclonal mast cell activation syndrome ?
    ### Response:
    Monoclonal mast cell activation syndrome (MMAS) is a rare immunological disorder characterized by recurrent episodes of allergy, flushing, stomach and intestinal cramping, diarrhea, wheezing, fatigue and a temporary loss of consciousness caused by a fall in blood pressure (hypotension).
    