IntroductionSeveral studies suggest that medical student empathy declines throughout medical school. However, no studies have systematically investigated why. The objective of our proposed review is to conduct a systematic review and thematic synthesis of qualitative studies investigating the reasons empathy may change throughout medical school.Methods and analysisThis systematic review protocol follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. We have searched MEDLINE, Scopus, CINAHL, ERIC and APA PsycINFO for relevant studies. We will also search reference lists of included studies and contact experts to identify additional studies. We will include any qualitative study investigating the reasons why empathy changes throughout medical school. We will use the Joanna Briggs Institute tool to evaluate the risk of bias in the included studies. We will use thematic analysis to synthesise our results. For all included studies, we will summarise the main characteristics including the number of participants, medical school year, country and gender. In our discussion, we will summarise the limitations of the evidence (including the risk of bias and inconsistency), and provide a general interpretation of the results and important implications.Ethics and disseminationThis study will not require ethical approval since no original data will be collected. The results of this review will be published through peer-reviewed publications and conference presentations. Additionally, this review will inform changes to the enhanced empathy curriculum at the Leicester Medical School.

Background Several studies suggest that medical student empathy declines throughout medical school. However, no studies have synthesised the evidence regarding why empathy declines. Objective To conduct a systematic review and thematic synthesis of qualitative studies investigating why student empathy may change throughout medical school. Methods We included any qualitative study that investigated why empathy might change during medical school. We searched the Medline, Scopus, CINAHL, ERIC, and APA PsycInfo databases for relevant studies. All databases were searched from their inception to 18 July 2022. We also searched the reference lists of the included studies and contacted experts to identify additional studies. We used the Joanna Briggs Institute tool to evaluate the risk of bias in the included studies. Overall confidence in our results was assessed using the Confidence in the Evidence from Reviews of Qualitative research (CERQual) approach. We used thematic methods to synthesise our findings. Results Our searches yielded 2523 records, and 16 studies involving a total of 771 students were eligible for analysis. Most studies (n = 11) were from Europe or North America. The descriptive themes and sub-themes were identified for each study. Increased complexity in patients and their diseases, together with the ‘hidden curriculum’ (including a stressful workload, prioritisation of biomedical knowledge, and (sometimes) poor role models), led to student adaptations, such as cynicism and desensitisation. Students’ prior lives and professional experiences appeared to exacerbate the decline in empathy. However, there were bias concerns for most of the included studies. Discussion Many of the included studies included were small, and some did not include demographic participant data. Given the likely benefits of providing empathic care for patients and practitioners, medical education interventions should focus on developing an ‘empathic hidden curriculum’ that mitigates the decline in medical student empathy. Trial registration A protocol for this systematic review was submitted for registration with the International Prospective Register of Systematic Reviews (PROSPERO) on 28 July 2022 (registration number CRD42022347856).