Dec 12, · Breast pain is usually not a sign of breast cancer. 3 In fact, many people who are diagnosed with breast cancer after a suspicious mammogram are shocked — they no breast pain, so how could something be wrong? Breast pain is usually present to some degree with Inflammatory Breast Cancer which has other distinct symptoms as well. Rarely, a breast tumor may cause pain, but generally cancerous tumors are not reported as painful. What should I do if I am experiencing breast pain? If you experience breast pain, contact your physician.