Background The breast cancer (BC) and its treatment (mastectomy, radiotherapy, and chemotherapy) have considerable psychosexual impacts on women's life. This study evaluated sexual functioning, quality of life, and self-esteem in young women with early-stage BC. Methods A total of 186 women with stage I or II BC and 204 age-matched controls aged 25-45years were recruited. To be eligible, patients had to be disease-free and sexually active. They also had to have undergone lumpectomy at least 1year previously and have completed chemotherapy and/or radiotherapy. Subjects completed Female Sexual Function Index, Short Form-36 Health Survey, and Rosenberg Self-Esteem questionnaire. Serum sex hormones were also measured in all subjects. Results Of BC patients, 57% experienced lubrication disorder followed by satisfaction disorder in 53.8%, desire disorder in 42.5%, and arousal disorder in 37.0% (all patients vs. healthy controls <0.01). Hormone-treated patients were more likely to report sexual dysfunctions (p=0.006). The radiotherapy+chemotherapy+hormone therapy was associated with an about sixfold increased risk of lubrication and satisfaction disorders (adjusted odds ratios=6.4, 95%CI=4.6-12.6, and adjusted odds ratios=5.7, 95%CI=3.4-11.4, respectively). Cancer patients had lower scores for all components of the Short Form-36 Health Survey, except for pain. Levels of self-esteem did not differ significantly between the two groups. Conclusions Young lumpectomized BC women reported a marked impairment in sexual functioning and quality of life. Copyright (c) 2012 John Wiley & Sons, Ltd.