Symptoms of breast tumors vary from person to person. Invasive breast cancer symptoms may include: A lump or mass in the breast, swelling of all or part of the breast, even if no lump is felt, Skin irritation or dimpling, Breast or nipple pain. Ductal carcinoma in situ (DCIS) does not cause any symptoms. Rarely, a woman may feel a lump in the breast or have nipple discharge. Lobular carcinoma in situ (LCIS) does not cause symptoms and cannot be seen with a mammogram. Inflammatory breast cancer (IBC) rarely causes breast lumps and may not appear on a mammogram. Metastatic breast cancer symptoms depend on the part of the body to which the cancer has spread and its stage. Male breast cancer symptoms can be similar to those experienced by women.