Swelling of all or part of a breast (even if no lump is felt)
Skin dimpling (sometimes looking like an orange peel)
Breast or nipple pain
Nipple retraction (turning inward)
Nipple or breast skin that is red, dry, flaking, or thickened
Nipple discharge (other than breast milk)
Swollen lymph nodes under the arm or near the collar bone (Sometimes this can be a sign of breast cancer spread even before the original tumor in the breast is large enough to be felt.)