Background: As more integrated cardiothoracic (CT) surgical residency programs are developed, there is increased interest in factors influencing specialty selection during undergraduate medical education. This study aimed to nationally assess interests and perceptions of CT surgery from medical students pursuing surgery and factors influencing such interests.Methods: Active members of the American College of Osteopathic Surgeons -Medical Student Section were invited to complete an original survey. Means and 95% confidence intervals were calculated and graphed for questions using Likert scale responses. The comparison of mean responses for students in preclinical versus clinical years was assessed by a Kruskal-Wallis non-parametric ANOVA. Differences between response proportions were assessed via Bonferroni Comparison of Column Proportions.Results: There were 306 surveys completed. Interest in CT surgery was indicated by 10.24% of respondents with preclinical students comprising 84.3% of those responses. Most students interested in CT surgery experienced certain factors including clinical exposure (78.4%), shadowing (81.8%), volunteering (57.1%), and significant personal/life events (86.2%) before medical school. Preclinical students noted exposure to CT surgery during preclinical years would further increase their interest when compared to clinical students (μ=4.12 versus μ=3.51, P<0.000). Importantly, clinical students feel significantly less supported by their school to pursue CT surgery compared to preclinical students (μ=2.45 versus μ=3.40, P<0.000).Conclusions: All factors establishing interest in CT surgery occurred before students entered medical school and during preclinical years. While there are negative perceptions associated with CT surgery, these may be ameliorated with increased support and resources for CT surgery during the preclinical years.