Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Diverticular Disease ?
    ### Response:
    People with diverticulitis may have many symptoms, the most common of which is pain in the lower left side of the abdomen. The pain is usually severe and comes on suddenly, though it can also be mild and then worsen over several days. The intensity of the pain can fluctuate.
    