Breasts that feel like they are full of small bumps may be cystic hyperplasia of the breast, breast cancer, benign tumors, and so on. 1. If you often feel small lumps inside the breast before menstruation, it is very likely to be cystic breast hyperplasia, which is common in middle-aged women, but teenagers and menopausal women can also have, in addition to feeling the small lumps that is the breast nodules, but also accompanied by breast pain, and a few will also have nipple overflow, especially obvious before menstruation, and can be slightly relieved after menstruation. 2. Breast cancer occurs in pre-menopausal women, early symptoms are not obvious, often with breast lumps (i.e. small bumps), breast skin abnormalities (such as dimple sign, orange peel sign), nipple discharge and other local manifestations of the disease, and seldom have pain. 3. Benign tumors: such as fibroma and intraductal papilloma. Breast fibroma is often manifested as a smooth, clear border painless lump, i.e., small lumps that can be touched, commonly seen in young women. Intraductal papillomas typically present as nipple discharge, but can also present as a localized lump, so they can also be felt as a small lump inside the breast, and are prevalent in the 40s and 50s, with surgery being an effective treatment. In addition, other causes such as lipoma underneath the breast skin should also be considered. If you have symptoms of the above diseases, you need to closely observe the progress, consult your doctor in time, and undergo regular treatment with the help of your doctor.