Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Non-A-E hepatitis ?
    ### Response:
    Non-A-E hepatitis, sometimes referred to as hepatitis X, is a disease of the liver that is diagnosed when there is swelling of the liver (hepatitis) but examination and testing does not identify a cause.  Symptoms of non-A-E hepatitis may include feeling tired or unwell (malaise), nausea, vomiting, pain in the abdomen, and fever.
    