Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Intestinal Pseudo-obstruction ?
    ### Response:
    Problems with nerves, muscles, or interstitial cells of Cajal cause intestinal pseudo-obstruction. Interstitial cells of Cajal are called pacemaker cells because they set the pace of intestinal contractions. These cells convey messages from nerves to muscles.
    