Objective:To determine the prevalence,factors associated with and patterns of concomitant Chinese medicine(CM)with Western treatment use among patients with rheumatoid arthritis(RA)in a tertiary referral centre(Singapore General Hospital)in Singapore.Methods:We conducted a cross-sectional interviewer-administered survey of a consecutive sample of patients with RA in Singapore General Hospital centre regarding their CM use including data on patient demographics,disease characteristics,concomitant use of CM and reasons,concerns and disclosure patterns from March to August 2015.Univariate and multivariate logistic regression analyses were performed to determine the associations of CM use.Results:Prevalence of CM use among the 258 patients surveyed(male:female 42:216;Chinese:Malay:Indian 191:29:34;mean age:61 years;mean duration of RA:10 years)was 46.1％(119/258).On multivariate analysis,Chinese ethnicity(OR,95％CI:4.11,1.49-11.36),Chinese speakers(OR,95％CI:2.35,1.03-5.54),middle-income group(OR,95％CI:2.53,1.01-6.31)and greater learned helplessness(OR,95％CI:1.13,1.04-1.22)were significantly associated with CM use.More CM users disclosed their CM use to CM physicians(87.3％,96/110),sought advice from them on treatment interactions(59.4％,57/96)and how best to combine treatments(49.0％,47/96)than did so with rheumatologists(42.0％,50/119;40.0％,20/50;and 42.0％,21/50,respectively).Forty-two percentage(29/69)of patients who concealed CM use from rheumatologists because their rheumatologists did not specifically enquire about CM use.Conclusions:Concomitant CM use among patients with RA treated in a tertiary referral centre in Singapore is high but voluntary disclosure is low.The associations identified can help doctors identify and enquire about CM use,minimizing potential adverse interactions.