Background Altered body image caused by alopecia, loss of eyebrows or eyelashes, or mastectomy is a major source of psychological distress in women with breast cancer. Objective To identify and to assess patients' perceptions and expectations regarding altered body image. Method Opinion survey conducted among patients treated for breast cancer and member of French online support groups. Anonymous online self-administered survey sent to women with breast cancer. Results 85% of the women interviewed experienced alopecia during treatment and 67% of them loss of eyebrows or eyelashes. About half of patients suffering alopecia and loss of eyebrows or eyelashes reported fearing what others think. Mastectomy was experienced by 84% of the women in our study, but only 32% of them reported fearing what others think. 87% of our study cohort received information about the possibility of adverse events. 70, 56, and 60% of women felt helped by information they receive d for the management of alopecia, loss of eyebrows or eyelashes, or mastectomy, respectively. Conclusion This study confirms that altered body image is a critical psychosocial issue for women with breast cancer. Effective information can be a source of reassurance and may constitute one of the most important sources of emotional support.