Breast cancer is a real public health problem because of the lack of early diagnosis and treatment, which is often delayed. In terms of incidence, breast cancer remains the most common cancer in women. The aim of this study is to evaluate the epidemiological profile and identify the anatomopathological features of breast cancer in young women aged 40 and under in the north-eastern region of Algeria (Sétif). Our work is based on a retrospective study of 40 cases admitted in the Setif medical oncology department during a period from January 2021 to March 2023. Epidemiological data show that the age group most affected in our population is 30-35 years, with the majority of patients being married (73%). Early menarche, family history and oral contraception may increase the risk of breast cancer in young women, whereas breastfeeding may protect them. Anatomopathological data show that the majority of our patients have an infiltrating carcinoma, with tumor size (T1) being the most frequent (27.50%) and a predominance of SBR II grades (75%). The young age, large tumor size and high histological grade that characterize our population can be explained by the poorer prognosis of breast cancer in young women.