Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Rheumatoid Arthritis ?
    ### Response:
    Rheumatoid arthritis is characterized by inflammation of the joint lining. This inflammation causes warmth, redness, swelling, and pain around the joints. The pain of rheumatoid arthritis varies greatly from person to person, for reasons that doctors do not yet understand completely.
    