The purpose of this study was to evaluate the incidence and clinical manifestations of benign breast lumps in adolescents admitted to a Al-Elwiya Teaching Hospital. All adolescents who visited the outpatient department (OPD) with breast lump complaints were enrolled in the study. Patients were a one hundred cases with breast lump with age of 25 years or less. All patients had assessment in the form of short history, clinical examination, ultrasound examination and fine needle aspiration cytology (FNA). As fibroadenoma found in 10% of all women according to the Autopsy studies. Regarding body mass index, no statistical difference was found. According to the occupation and educational level, no difference in the diagnosis was found. Marital status had no difference on the diagnosis of breast mass. Nulliparity (together with gravidity, parity and miscarriage) were associated with high rate of fibroadenoma. The side of the breast mass, past surgical history, past medical history, smoking all were not different in regard to the diagnosis of breast mass. Although, both family history and 1st and 2nd degree relatives with benign breast disease were not significant different in regard to the diagnosis of breast mass; all cases of positive family history of fibroadenoma had the similar diagnosis in both 1st and 2nd degree relatives. Most common cause of benign breast mass is fibroadenoma. Fibroadenoma was more common in age group ranged from 15-21 years, cases of nulliparity, positive family history and hormonal treatment.