Lymph Node Changes
Lymph nodes are thin, rounded immune system tissue collections that filter the fluid and catch potentially harmful pathogens. These include cancerous cells, bacteria, and viruses. When a cancer cell leaves the breast, the first location that it moves to is the area of the underarm lymph node on the same side as the infected breast. This can cause the region to swell.
A person may notice them around the collarbone, in addition to swollen lymph nodes in the armpit. They usually feel small, solid, swollen lumps and can be sensitive to the touch. Nevertheless, due to breast infections or other completely unrelated diseases, the lymph tissue may also alter. A person should discuss these changes with a doctor to determine the underlying cause.