Background and Objective: Rheumatoid arthritisis a chronic autoimmune inflammatory disease characterized by joint pain, swelling, and mobility limitations. In addition to physical symptoms, psychological factors such as anxiety, depression, stress, pain catastrophizing, and fear of movement can significantly impact the quality of life of patients. The aim of this study was to investigate the relationships between emotional symptoms (anxiety, depression, stress), pain catastrophizing, and fear of movement in patients with rheumatoid arthritis. Methods: This descriptive-analytical study was conducted in 2023 on 66 patients with rheumatoid arthritis (aged 18–60 years) at the Rheumatology Clinic of Kashan. Data were collected using the DASS-21, the PCS, and the TAMPA questionnaires. Data analysis was performed using SPSS software. The Shapiro–Wilk test was applied to assess the normality of data distribution, and Pearson correlation coefficients were calculated to examine the relationships among the variables. Results: The participants had a mean age of 41.2 years (SD = 10.5), and the majority were women (84.6%). Significant correlations were observed among anxiety, depression, stress, pain catastrophizing, and fear of movement (p < 0.01). The strongest associations emerged between anxiety and depression (r = 0.675), as well as between pain catastrophizing and fear of movement (r = 0.651). Additionally, anxiety showed significant positive correlations with both pain catastrophizing (r = 0.508) and stress (r = 0.668). Conclusion: This study demonstrates that psychological symptoms such as anxiety, depression, and stress can directly and indirectly affect pain catastrophizing and fear of movement. The findings suggest that psychological treatments, particularly cognitive-behavioral therapies, may be effective in reducing the psychological and physical symptoms of patients with rheumatoid arthritis.