Undifferentiated arthritis (UA) is a diagnosis of exclusion made in patients with inflammatory arthritis who have at least one clinically swollen joint, in the absence of further findings on a thorough evaluation that allow for making a diagnosis of another specific rheumatologic disease.
A complaint of arthralgia in the absence of a swollen joint on examination or findings such as pain on motion or tenderness upon pressure is not sufficient to make a diagnosis of UA.



Patients with UA require effective treatment to begin to alleviate symptoms and to alleviate and prevent the functional impairment associated with active disease.





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Physical Exam


Laboratory Tests



Essentail Criteria to Establish Diagnosis



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