Depending on the etiology, pain may be present in 1,2, or more joints. Considering the patient's age, medical history, and medication profile is important. The patient's lifestyle and social history should also be considered, as certain activities may predispose a patient to specific infections. Among the major diagnoses that have to be considered in a nontraumatic swollen joint are gout (or any crystal-induced arthritis), infectious arthritis, osteoarthritis, and rheumatoid arthritis. A short discussion on low back pain is included.
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