A hard lump above the left breast is related to breast fibroids, breast hyperplasia, breast tumors and other factors. A hard lump on the left breast should be considered to be related to mammary fibroids. Most patients have bad habits and high estrogen levels in their bodies, which can lead to excessive proliferation of fibrous tissue in the breast due to long-term stimulation of estrogen, and local hard lumps can be formed due to structural disorders in the breast, which are small and painless and need to be closely observed. A lump on the top of the left breast in women of childbearing age is considered to be related to breast hyperplasia, which is a benign disease, and an increase in hormone levels before menstruation can lead to an increase in the size of the lump and possibly pain. After finding a lump in the chest, you should follow up regularly, observe closely and go to the hospital for ultrasound review in time, because it may also be caused by breast tumor, and early breast tumor has no obvious symptoms, but as the lump increases or metastasizes, it may also cause pain.