Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Levator syndrome ?
    ### Response:
    Levator syndrome is characterized by sporadic pain in the rectum caused by spasm of a muscle near the anus (the levator ani muscle). The muscle spasm causes pain that typically is not related to defecation. The pain usually lasts less than 20 minutes. Pain may be brief and intense or a vague ache high in the rectum.
    