Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the complications of Ulcerative Colitis ?
    ### Response:
    Complications of ulcerative colitis can include
                
- rectal bleedingwhen ulcers in the intestinal lining open and bleed. Rectal bleeding can cause anemia, which health care providers can treat with diet changes and iron supplements. People who have a large amount of bleeding in the intestine over a short period of time may require surgery to stop the bleeding.
    