 Hello, I am Dr. Poonam Patil working as Medical Oncologist in Manipal Hospital here in Bangalore. 8 out of 10 breast lumps are not cancers. There are four most common causes of breast lumps. First, fibroadenomas which are solid tumours which are seen in most of the young women. Second, cystic lumps, cystic lumps are fluid filled lumps in the breast. There are also most of the times they are benign. Third, fibrocystic disease which is kind of a combination of solid component and the cystic component. Again they are seen in perimenopausal women. It's quite commonly seen. And fourth of course the malignant breast lumps. But most of the times the lumps are not cancers.