Introduction: During the menstrual period, pregnancy and menopause breast is constantly affected physically and physiologically. The importance of breast diseases increase with the growing number of breast cancers. Given the high prevalence of breast disorders, this study was conducted to investigate the factors influencing breast lumps in women referring to health centers in 1390 in Aran and Bidgol.

Materials & methods: This case-control study was conducted on 198 women without breast lump and 198 with breast lump that referred to health centers of Aran and Bidgol. Data was collected through a questionnaire containing demographic, fertility and its diagnosis.

Findings: The results showed that the chances of having a mass in patients with benign cysts compared to those without, is equal to OR = 0.76. Chances of having a mass in people with a record of fibrocystic to those without cysts is OR = 5, and the chances of having a mass in patients with fibro adenoma to those without, is equal to OR = 33. Only the result for having a record of fibro adenomas was significant.

Discussion & conclusions: Benign breast lumps in the majority of cases occur in women of reproductive age. Although most common in lumps of reproductive age have been fibrocystic and fibroadenomas, because of significant associations the incidence of mass with history of lumps is recommended to paying more attention to early detection, screening studies and check in younger women than to western country women.