Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mumps ?
    ### Response:
    Mumps is an illness caused by the mumps virus. It starts with       - Fever    - Headache    - Muscle aches    - Tiredness    - Loss of appetite       After that, the salivary glands under the ears or jaw become swollen and tender. The swelling can be on one or both sides of the face.
    