Abstract:Objective: To investigate the epidemic characteristics of elderly chronic pain patients in outpatient department in 3 provinces and cities in China. Methods: From April to August 2023, a multi-stage stratified sampling method was used to select a tertiary class A general hospital and a secondary class A general hospital in each of Beijing, Chongqing, Jiangxi Province, and included chronic pain patients aged 45 years and older who had been experiencing pain for over 3 months. Questionnaire was used to collect information about the patients" general characteristics and the epidemiological features of chronic pain. The χ2 test was performed for inter-group comparisons and multiple logistic regression analysis was used to identify factors influencing the severity of pain in patients. Results: The effective sample size for analysis included 4,151 outpatient chronic pain patients, comprising 1,803 males (43.4%) and 2,348 females (56.6%). Pain severity was categorized as mild in 1,079 cases (26.0%), moderate in 2,535 cases (61.1%), and severe in 537 cases (12.9%). Significant differences in pain severity distribution were observed based on age (χ2=43.847, P<0.001), region (χ2=945.384, P<0.001), urban and rural (χ2=135.31, P<0.001), education level (χ2=39.465, P<0.001), employment status (χ2=34.433, P<0.001), family annual income (χ2=166.948, P<0.001), previous history (χ2=15.467, P<0.001), drinking (χ2=13.482, P<0.01), pain duration (χ2=24.901, P<0.001), pain site(χ2=108.191, P<0.001) and pain intensity distribution were statistically significant (P<0.05). Multiple logistic regression analysis showed that age ≥65 years old (OR=1.89,95%CI: 1.41~2.54), living in rural areas (OR=2.44,95%CI: 1.70~3.51), ≥2 pain sites (OR=2.66,95%CI: 2.05~3.46), no-drinking (OR=1.48,95%CI:1.01~2.12) is a risk factor for severe pain; The central region (OR=1.36,95%CI:1.01~1.83), the employed person (OR=1.24,95%CI:1.03~1.50) and pain sites≥2 (OR=1.76,95%CI:1.49~2.08) were the risk factors for moderate pain, with statistical significance (P<0.05). Conclusion: In outpatient department across three provinces and cities in China, middle-aged and elderly patients predominantly experience moderate chronic pain. Age, urban or rural residence, and the location of pain are significant influencing factors for pain severity. Early identification and intervention of these relevant factors are essential to comprehensively assess pain levels and develop personalized treatment plans, ultimately enhancing the effectiveness of pain management and treatment for patients.