Sarcoidosis is a systemic granulomatous disease, most commonly manifested by pulmonary hilus and mediastinal lymph node enlargement, and interstitial changes in the lungs. The diagnosis of sarcoidosis is based on the typical clinical and radiological picture, finding non caseating granulomas and exclusion of diseases with a similar clinical and pathological picture. The basis for diagnosis is the histological picture of sarcoid granulation tissue taken from the patient. Articular changes in acute form may resemble rheumatoid arthritis (RA). In sarcoidosis, chronic articular changes include one or more joints, particularly the knee and ankle joints. A case of coexistence of sarcoidosis disease with symptoms of the osteoarticular system resembling RA is presented. In histopathological examination of lymph nodes sarcoid granulation was found. Glucocorticosteroid treatment was started. Further observation of the patient led to the diagnosis of concomitant RA and to implementation of DMARD therapy with a favorable clinical result.