Rigorosal thesis deals with one of the most frequent autoimmune diseases – rheumatoid arthritis (RA). By questionnaire survey of patient’s group with progressed form of RA (mainly form districts of Eastern Slovakia), it evaluates acquired data, which are commonly related to patology, patogenesis or epidemiology of RA. Sex distribution of patients was in 3:1 ratio in a favor of women. Age of the first registered symptoms of this disease was in the interval between 16 and 55 years. The most common comorbidities were hypertension and diabetes mellitus. Diabetes was more prevalent in our group, than in healthy population study. RA affected joints can be different between men and women. Significant variance was found within articular group of small joints of hands and feet, and also within cervical spine, which was more prevalent in women. Statistics about pharmacotherapy was focused on biological treatment, because medical facility, where the survey was conducted, is one of the few in Slovakia, where these types of drugs are administered. The most used ones from this group were tumor necrosis factor inhibitors – adalimumab, then etanercept and infliximab. From conventional disease modifying drugs, the most common was methotrexate and for sympthomatic treatment of pain, it was diclofenac. In addition to questionnaires, we gathered information about rheumatoid factor (RF) for the same patient’s sample, from clinic’s medical records. This immunological parameter is evaluated as a part of a diagnostic process. 84,4% of patients with diagnosed RA had positive test on RF. Rheumatoid arthritis and its specifics in our patients from Eastern Slovakia (including RF) investigated in this work are very similar to these from foreign literature.