Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Carcinoid syndrome ?
    ### Response:
    Carcinoid syndrome refers to a group of symptoms that are associated with carcinoid tumors (rare, slow-growing tumors that occur most frequently in the gastroinestinal tract or lungs). Affected people may experience skin flushing, abdominal pain, diarrhea, difficulty breathing, rapid heart rate, low blood pressure, skin lesions on the face (telangiectasias), and wheezing.
    