A lot of small lumps in the breast may be related to breast hyperplasia, breast fibroadenoma, breast cancer and other diseases. 1. Breast hyperplasia: Breast hyperplasia is a common benign breast lesion, the first symptom is breast pain, may be accompanied by breast nodules or lumps, and a few patients will also appear nipple fluid overflow, so when you feel a lot of small bumps, you need to consider that it is related to breast hyperplasia. 2. Breast fibroadenoma: Breast fibroadenoma is a common benign tumor of female breast, the main cause is the abnormal increase of sensitivity of fibroblasts to estrogen in the lobules of the breast, the symptoms will appear as breast lumps, which vary in size, and when touched by hand, you may feel a lot of small bumps. 3. Breast Cancer: Breast cancer is a malignant tumor formed by the uncontrolled proliferation of breast epithelial tissues under the action of various carcinogenic factors. Breast cancer will show breast lumps, nipple and areola changes, nipple overflow and so on. The specific treatments will vary depending on the causes of the disease, and it is not recommended that patients treat themselves privately to avoid inappropriate treatment methods.