Background: Breast cancer is one of the diseases that is due create psychological and especially apparent effects in women reduce their sense of worth and self-esteem. The purpose of this study is investigating effectiveness of anger control skills training on improving self-esteem in women with breast cancer after mastectomy surgery.
Methods: In this semi-experimental study, between 79 women who had cancer treatment for at least 6 months and had a mastectomy sugery, 30 women with breast cancer after mastectomy surgery were selected and randomly assigned to experimental and control group (each group has 15 people). The experimental group was trained group anger control skills with a cognitive-behavioral approach but the control group did not receive any interventions. Patients answered Rosenberg self-esteem Scale (1965) in pre test and post test.  
Results: Covariance analysis showed that there was a significant difference between experimental and control groups in the post-test self-esteem.  Eta's squareness showed that 64% of self-esteem changes in the post-test were due to the effect of anger control skills training.
Conclusion: This study shows that anger control skills training can increase the self-esteem of women with breast cancer after mastectomy sugery. The use of these trainings along with drug therapy improving the mental health of patients and their families.