Medical professionals who specialize in the diagnoses and treatments of rheumatic diseases; such as, arthritis, vasculitis, and lupus: "Rheumatologists have special interests in unexplained rashes, fevers, arthritides (plural form of arthritis), anemias, weaknesses, weight losses, fatigues, joint or muscle pains, autoimmune diseases, and anorexias; and they often serve as consultants who function like researchers and diagnosticians for other doctors."