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Yuichi Katsura,1,2 Satoshi Ohga,3 Kazuhiro Shimo,3 Takafumi Hattori,2 Tsukasa Yamada,1,2 Takako Matsubara2,3 1Department of Rehabilitation, Kishiwada Rehabilitation Hospital, Kishiwada-shi, Osaka, 596-0827, Japan; 2Faculty of Rehabilitation, Kobe Gakuin University Graduate School, Kobe, Hyogo, 651-2180, Japan; 3Faculty of Rehabilitation, Kobe Gakuin University, Kobe, Hyogo, 651-2180, JapanCorrespondence: Yuichi Katsura, Department of Rehabilitation, Kishiwada Rehabilitation Hospital, 8-10, Kanmatsu-chou, Kishiwada-shi, Osaka, 596-0827, Japan, Tel +81-72-426-7777, Fax +81-72-426-7771, Email rm9xhj04@s.kobegakuin.ac.jpPurpose: The purpose of this study was to investigate the prevalence of post-stroke complex regional pain syndrome (CRPS) and to examine the characteristics of inactivity status of the upper limb in post-stroke CRPS patients. In addition, as a sub-analysis, the association between the upper limb inactivity status and pain intensity was investigated in post-stroke CRPS patients.Patients and Methods: This cross-sectional study included 102 patients with first-ever stroke between April 2019 and February 2020. Each patient was allocated into one of two groups based on the presence or absence of CRPS. Demographic data (age, sex, stroke etiology, lesion side, and number of days since stroke onset) were collected. The following evaluations were performed in all patients: Fugl–Meyer Assessment (FMA), Action Research Arm Test (ARAT), and Motor Activity Log (MAL). The numerical rating scale (NRS) to determine pain intensity was assessed only in patients with post-stroke CRPS.Results: Nineteen and 83 patients were assigned to the post-stroke CRPS and control group, respectively. The prevalence of post-stroke CRPS was 18.6% (19/102). FMA, ARAT, and MAL scores were significantly lower in patients with post-stroke CRPS than those without it. FMA and ARAT scores were significantly correlated with NRS scores, but MAL was almost zero-scored in patients with post-stroke CRPS.Conclusion: The study results indicated that activity status of the affected upper limb was severely deteriorated, and more inactivity of the upper limb was associated with higher pain intensity in patients with post-stroke CRPS. Thus, our results suggest that post-stroke CRPS may be influenced by the degree of upper limb inactivity after stroke.Keywords: complex regional pain syndrome, post-stroke shoulder-hand syndrome, stroke, Fugl–Meyer Assessment, Action Research Arm Test, Motor Activity Log