Early breast cancer may have no symptoms: that is why it is so important to get yearly mammograms @ 40 yo and up.
A 'lump' may be palpable (felt) when the cancer has progressed to >1cm size or greater. Other late findings: lymph nodes in the 'arm pit' (axilla), 'dimpling' of the skin, or nipple discharge
. Inflammatory breast cancer
can present as a 'red rash' on 1 breast or a nipple involvement.