Introduction: Breast cancer is the most common malignant disease in women which compromises person’s spiritual health. Given the importance of spiritual health and its effect on self-efficacy, the aim of this study was to determine the relationship between self-efficacy and mental health in women with breast cancer.
Methods: This Cross-Sectional correlative study was conducted on 196 women with breast cancer referred to hematology and intensive care unit of Shahid Beheshti Hospital, medical center and Mahdiei MRI clinic in Hamadan during 2016-2017. The study subjects were selected by simple convenience sampling method. The measurement tools were Demographic questionnaire, the Sherer self-efficacy scale and Palutziam and Ellison spiritual health which was completed by patients. Data was analyzed by SPSS18 using statistical methods including Pearson correlation coefficient, independent t-test, ANOVA and logistic regression.                
Results: The score of majority of women in spiritual well-being (43/87%) and efficacy (41/83%) were in a moderate level. The mean number of spiritual health was 55.92±2.48 and the mean number self-efficacy was 44.33±3.08, respectively and both of them were average. .  There was positive significant correlation between self-efficacy and spiritual health (P <0/01 r = 0.04). There was also significant association between all demographic characteristics and spiritual health and other demographic characteristics including (education, breastfeeding frequency, type of insurance, duration of breast cancer and involved lobe) and self-efficacy (P<0/05).
Conclusion: With regards to relationship between self-efficacy and spiritual health, it seems that in order to enhance the self-efficacy in patients with other chronic diseases such as cancer attention to spiritual health is recommended.