Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for Ulcerative Colitis ?
    ### Response:
    - Ulcerative colitis is a chronic, or long lasting, disease that causes inflammationirritation or swellingand sores called ulcers on the inner lining of the large intestine.  - The exact cause of ulcerative colitis is unknown. Researchers believe that factors such as an overactive intestinal immune system, genes, and environment may play a role in causing ulcerative colitis.
    