Objectives: Emotional and cognitive factors have been shown to affect pain, and one of the main factors in the development of this effect is pain catastrophizing. The present study aims to determine the effect and frequency of the pain catastrophizing in shoulder lesions and to examine the association between pain catastrophizing and to assess the pre-operative and post- operative functional outcomes. Methods: A total of 114 patients who underwent shoulder arthroscopy were included study. Pain catastrophizing scale, Tam- pa kinesiophobia scale, visual analog scale, and University of California at Los Angeles shoulder scale were used for evaluating patients’ pre- and post-operative pain and functional situation. Results: Pain catastrophizing was detected 42 of 114 patients (37%). Kinesiophobia was higher in patients who catastroph- ized shoulder pain (p<0.0001). If participant had a labrum (p=0.038), supraspinatus (p=0.043), or biceps pathology (p=0.032), catastrophization was determined more often. There was catastrophization in 50% of patients with post-operative University of California at Los Angeles score which was evaluated as fair/poor (p=0.039). Conclusion: Pre- and post-operative results of the current study strengthened the data about importance of catastrophiza- tion. Catastrophization (+) patient group had lower functional capacity outcomes than that of the catastrophization (−) pa- tient group. Decreased levels of pain catastrophizing and kinesiophobia in surgically and conservatively treated patients will result in more satisfactory clinical outcomes.