Double mastectomy expanders: what to know

An expander is a temporary device placed beneath chest tissue during or after mastectomy. At follow-up visits, the surgical team may add sterile fluid through a small access point, allowing the skin and soft tissue to stretch gradually. The expander is later exchanged for a permanent implant, or reconstruction may use your own tissue. Some people have reconstruction on both sides; the timing depends on healing, cancer treatment and personal preference.

The chest can feel tight, firm or uneven while expansion is underway. Numbness around the scar is common because small nerves are affected by surgery. Expanders do not decide whether chemotherapy, radiotherapy or other treatment is needed; those decisions depend on the cancer findings and treatment plan.

Before surgery, discuss whether expansion will be immediate or delayed, how appointments fit around systemic treatment, and what movement limits apply. Arrange help with washing, dressing and household tasks at first. Follow wound and drain instructions, take medicines exactly as prescribed, and avoid lifting or strenuous arm activity until your team clears it. Gentle shoulder exercises may be recommended to protect movement; a rehabilitation clinician can tailor them.

Ask who to contact about a drain, an expander that feels suddenly different, or discomfort that is not controlled by the prescribed plan. Lymphoedema therapy may help when arm or chest swelling develops after lymph-node treatment.

Contact your surgical team promptly for increasing redness, warmth, swelling, wound separation, cloudy or foul-smelling drainage, fever, or pain that is worsening rather than settling. Seek urgent help for sudden breathing difficulty, chest pain, fainting, or rapidly increasing swelling. A small amount of expected drainage can be normal, but your team should interpret changes in the context of your operation.

Ask: Which expander and reconstruction route suit my chest and treatment plan? When will fills begin and when is exchange surgery considered? How might radiotherapy affect the options? Which activities, sleep positions and exercises are appropriate? What symptoms mean I should call the team today?