The aim of this study was to investigate any association between self-rated health (SRH) and general perception about medicines using the Beliefs About Medicine Questionnaire-General (BMQ-G) in Hong Kong hospital outpatients. Moreover, the study aims to demonstrate any association between social desirability bias or response (SDR) and BMQ-G, SRH reporting in this population. Methods: Seven hundred and sixty-nine outpatients, who satisfied the selection criteria, were cordially invited to participate in this study by completing a combined questionnaire of demographic information, BMQ-G, SRH and SDR Set-5 in person, while waiting to collect their medications outside a Hong Kong hospital pharmacy. Results were analysed statistically. Key Findings: The number of valid questionnaires returned for statistical analysis was 698. Logistic regressions indicated age groups, gender and SRH were significant predictors for BMQ-G reporting. Patients aged over 62, male or those with high SRH were less likely to present high BMQ-G scores, compared to patients aged under 45, female or those with low SRH, respectively (OR 0.43, 0.73 and 0.66, respectively, all CIs 95%). Logistic regressions also demonstrated overall BMQ-G, and SRH reporting was unlikely to be associated with SDR (all P > 0.05) although age was a significant predictor for SDR reporting (OR = 1.10; CI 95%). Conclusions: This study illustrated age groups, gender and self-rated health significantly associated with general medicine beliefs reporting. The possible association between socially desirable bias and general medicine beliefs or self-rated health reporting was insignificant.