Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Proctitis ?
    ### Response:
    Proctitis has many causes, including acute, or sudden and short-term, and chronic, or long-lasting, conditions. Among the causes are the following:
                
- Sexually transmitted diseases (STDs). STDs that can be passed when a person is receiving anal sex are a common cause of proctitis.
    