Signs and symptoms of breast cancer may include

BREAST CANCER
Breast cancer is cancer that forms in the cells of the breasts.
Signs and symptoms of breast cancer may include:
A breast lump or thickening that feels different from the surrounding tissueChange in the size, shape or appearance of a breastChanges to the skin over the breast, such as dimplingA newly inverted nipplePeeling, scaling, crusting or flaking of the pigmented area of skin surrounding the nipple (areola) or breast skinRedness or pitting of the skin over your breast, like the skin of an orange
Causes
Doctors know that breast cancer occurs when some breast cells begin to grow abnormally. These cells divide more rapidly than healthy cells do and continue to accumulate, forming a lump or mass. Cells may spread (metastasize) through your breast to your lymph nodes or to other parts of your body.
Breast cancer most often begins with cells in the milk-producing ducts (invasive ductal carcinoma). Breast cancer may also begin in the glandular tissue called lobules (invasive lobular carcinoma) or in other cells or tissue within the breast.
Risk Factors:-:
Radiation exposure. If you received radiation treatments to your chest as a child or young adult, your risk of breast cancer is increased.Obesity. Being obese increases your risk of breast cancer.Beginning your period at a younger age. Beginning your period before age 12 increases your risk of breast cancer.Beginning menopause at an older age. If you began menopause at an older age, you’re more likely to develop breast cancer.Having your first child at an older age. Women who give birth to their first child after age 30 may have an increased risk of breast cancer