At this age, breast carcinoma is uncommon, and breast fullness or a palpable abnormality is more frequently due to benign causes such as fibroadenoma, fibrocystic changes, cysts, infection, or reactive lymphadenopathy. However, malignancy cannot be excluded solely on the basis of age or ultrasound findings. The ultrasound report should be reviewed carefully, particularly the BI-RADS category and the morphology of both the breast lesion and lymph nodes. If the lymph nodes have suspicious features or a suspicious breast mass is present, further evaluation by a breast specialist is indicated.

A reactive lymph node on your ultrasound is usually a benign, inflammatory finding. Breast discomfort without a felt lump doesn't point toward cancer.