What should you know about mastectomy of left breast?

Before surgery, your team marks the correct side and explains the incision, drains, and expected chest shape. Sentinel node sampling or axillary surgery may be performed during the same operation. The heart is not operated on during mastectomy, although left-sided wounds can make chest movement feel unfamiliar.

You may compare this approach with [Lumpectomy](/treatments/surgical-oncology/lumpectomy/), which preserves more breast tissue for selected situations. [Mastectomy](/treatments/surgical-oncology/mastectomy/) can be followed by [Breast Reconstruction](/treatments/surgical-oncology/breast-reconstruction/) immediately or later, or by a flat closure.

Use the pain medicines and dressing instructions provided, and keep drains secured so they do not pull on the incision. Sleep in the position recommended by your team and avoid lifting with the left arm until cleared. Short walks can support mobility, while shoulder exercises should begin only at the advised point.

Expect possible numbness, tightness, bruising, or a change in the contour of the left chest. Protect areas with reduced feeling from heat and friction. If nodes were removed, ask about [Lymphoedema Therapy](/treatments/survivorship-and-rehabilitation/lymphoedema-therapy/) if swelling or heaviness develops in the left arm or chest.

Contact the surgical team for increasing left-sided redness, warmth, discharge, fever, wound separation, worsening pain, or swelling that appears suddenly. Seek emergency help for chest pain with breathlessness, fainting, or bleeding that continues despite pressure. Do not assume new chest symptoms are part of routine healing.

Ask which left breast structures and nodes will be removed, how the incision will affect movement, when the drain comes out, and how pathology will guide treatment. Ask whether [Chemotherapy Before Surgery](/treatments/systemic-therapy/neoadjuvant-chemotherapy/) is relevant and when you can drive, work, and exercise.