BackgroundThis study aimed to explain the fear of surgery in surgical patients, the affecting factors, and their relationship.MethodsThis study was conducted as a descriptive and cross-sectional study. The study population consists of 300 patients undergoing surgical intervention. Data were collected using the “patient information form” and “Surgical Fear Questionnaire.” Parametric and nonparametric tests were used to evaluate the data. The relationship between the fear questionnaire and age, number of previous surgeries, and pre-operative pain was evaluated using Spearman correlation analysis. The relationship with emotional stress was evaluated with multiple linear regression analysis.ResultsIn this study, it was determined that the predictors of the surgical fear level of the patients were age, gender, anesthesia type, and pre-operative pain experience. There was a negative correlation between the age of the patients and the fear of surgery score and a positive correlation between the pre-operative pain severity and the fear of surgery score. It was determined that the factors most associated with pre-operative fear levels were the patients’ pre-operative sense of inadequacy (p< 0.001), feeling anxious and unhappy, and confusion about the surgery decision (p< 0.05).ConclusionAccording to the results of this study, it has been determined that the emotional states and fears of the patients before the surgery have significant effects on the fear of surgery. For this, it is recommended to determine the emotional states and fears of the patients before the surgery and to make appropriate interventions, as it will facilitate compliance with the surgical process.Supplementary InformationThe online version contains supplementary material available at 10.1186/s13741-023-00316-0.