When they do, lymph nodes increase in size and are easily felt. A breast self-examination should always include the armpit
because breast cancer
can enlarge the armpit
lymph nodes even when the breast itself seems perfectly normal.
Lumps may occur when lymph nodes are swollen due to bacterial or viral infections, vaccinations , and cancer.
After performing a physical exam, which includes both breasts, armpits, and the neck and chest area.