Nursing care
Breast Cancer Nursing Care nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Breast cancer nursing care centres on early detection, perioperative assessment, and permanent arm protection after axillary node dissection. Once axillary nodes are removed, no blood pressures, injections, or venepuncture are performed on that arm for life, because lymphoedema from node removal does not resolve. Nurses assess for it at every future encounter, not only in the immediate postoperative period.
What it is and why it happens
Breast cancer arises when cells in breast tissue, most often in the ductal or lobular epithelium, undergo malignant transformation and proliferate without normal growth control. Risk is shaped by age, family history, BRCA1 and BRCA2 mutation status, prior chest radiation, and hormonal exposure factors including early menarche, late menopause, and nulliparity. Staging and receptor status, oestrogen, progesterone, and HER2, determine the treatment pathway, which may combine surgery, radiation, chemotherapy, and targeted or hormonal therapy.
Surgical management ranges from breast-conserving lumpectomy to mastectomy, and nodal staging is assessed through sentinel lymph node biopsy or, when nodes are involved, axillary lymph node dissection. Axillary dissection removes multiple lymph nodes from the armpit on the affected side, and this is the step that permanently disrupts lymphatic drainage from that arm. The disruption is structural and does not heal, which is why the arm precautions that follow are lifelong rather than a temporary postoperative measure.
How it presents — what you will actually see
Early presentation is often a painless lump found on self-examination or screening mammography, sometimes with skin dimpling, nipple retraction, or a palpable axillary node. Peau d'orange skin changes, nipple discharge, or a fixed, hard mass with irregular borders suggest more advanced local disease and warrant prompt referral.
Postoperatively, the patient presents with a surgical dressing or drain over the operative site, decreased range of motion in the shoulder on the affected side, and possible numbness or tingling along the inner upper arm from intercostobrachial nerve disruption during axillary dissection. Early signs of lymphoedema include a feeling of heaviness or tightness in the arm and mild swelling that may not yet be visible on inspection, which is why baseline and follow-up arm measurements matter.
Nursing assessment priorities
Postoperative assessment focuses on the surgical site for bleeding, drain output volume and character, and signs of infection, alongside pain control and psychological response to diagnosis and body image change. Shoulder range of motion on the affected side is assessed and gently encouraged per surgical protocol, since immobility increases the risk of frozen shoulder and does not protect against lymphoedema.
The assessment that must never lapse, in the perioperative period and at every subsequent healthcare encounter for the rest of the patient's life, is checking which arm underwent axillary node dissection before applying a blood pressure cuff, drawing blood, inserting an IV, or giving an injection. This is not a postoperative-only precaution. It belongs on the chart, on the wristband where the institution supports it, and in the handoff, because the risk of triggering or worsening lymphoedema in that arm does not diminish with time since surgery.
Interventions and what to do first
Immediately postoperative, the priority is monitoring for haemorrhage and haematoma at the surgical site, managing drain output, and controlling pain to support early, protocol-guided arm mobility. Elevating the affected arm on a pillow reduces swelling in the early postoperative window and should be established before other lower-priority comfort measures.
The standing intervention that applies for life is protecting the arm on the side of axillary dissection from any procedure that could trigger lymphoedema or infection: no blood pressure readings, no venepuncture, no injections, and no IV insertion on that arm. This should be established as a standing instruction communicated to the patient, documented clearly, and re-confirmed by any new clinician before performing a procedure that would normally default to whichever arm is convenient. The patient should also be taught to protect that arm from cuts, burns, sunburn, and insect bites, and to seek prompt review for any sign of infection in that limb, since a compromised lymphatic system clears infection poorly.
Complications to watch for
Lymphoedema is the complication tied directly to node removal, presenting as swelling, heaviness, or tightness in the affected arm that can develop weeks, months, or years after surgery and, once established, is managed rather than cured. Infection in the affected arm, cellulitis, is a related risk because impaired lymphatic drainage reduces the arm's ability to clear pathogens, and it can progress quickly.
Other complications include seroma formation at the surgical site, wound infection, frozen shoulder from inadequate postoperative mobilisation, and chemotherapy- or radiation-specific effects such as cardiotoxicity with certain regimens or skin changes with radiation. Psychological complications, including depression and altered body image, are common and should be screened for at follow-up, not only assumed to resolve once the physical recovery is complete.
Patient teaching before discharge
Before discharge, the patient and family need to understand that any procedure involving a blood pressure cuff, needle, or injection must avoid the arm on the side of axillary dissection permanently, and that this instruction should be repeated to every new clinician the patient sees, including outside this hospital system. Provide this in writing as well as verbally, since it is easy to forget under the pressure of an unrelated acute visit years later.
Teach the early signs of lymphoedema, so the patient recognises heaviness, tightness, or swelling and seeks review promptly rather than waiting for visible oedema. Cover skin protection for the affected arm, avoiding cuts, burns, and insect bites, and wearing gloves for gardening or similar tasks. Reinforce drain care and incision hygiene if discharged with a drain in place, the schedule for follow-up oncology and surgical review, and where to access support for the emotional impact of diagnosis and surgery, since ongoing psychological support is part of comprehensive discharge planning.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our med-surg practice questions are the closest set to what this page covers.
One question from the med-surg set
A client with chronic obstructive pulmonary disease has an oxygen saturation of 88% on 2 L/min via nasal cannula and is alert with no distress. What should the nurse do first?
Rationale
In COPD a saturation of 88–92% is the therapeutic target, not an emergency, and this client is alert with no distress. The first action is the independent nursing intervention that is least invasive and most likely to help: sit them up and reassess. Turning the oxygen up to 6 L/min risks blunting the hypoxic drive, and calling rapid response or drawing an ABG escalates ahead of an assessment you have not finished.
Answer: B
Common questions
Why can blood pressure never be taken on the arm after axillary node dissection?
Removing axillary lymph nodes permanently disrupts lymphatic drainage from that arm. A blood pressure cuff, along with venepuncture or injections, can trigger or worsen lymphoedema and increase infection risk in a limb with compromised lymphatic clearance, so the precaution applies for life, not just during recovery.
Does lymphoedema after axillary dissection ever fully resolve?
No. Once the lymphatic pathways are disrupted by node removal, the risk and any resulting swelling are managed long-term rather than cured. Management includes compression, exercise, and skin protection, and the arm precautions remain permanent.
What is the first postoperative nursing priority after breast cancer surgery?
Monitoring the surgical site for bleeding or haematoma, tracking drain output, and managing pain to support early guided mobility come first. Arm elevation on a pillow to limit early swelling is established alongside these, before broader teaching begins.
How soon after axillary dissection can lymphoedema develop?
It can develop at any point after surgery, from the immediate postoperative period to years later. This is why the arm precautions and patient education are lifelong rather than limited to the initial recovery window.
What early sign of lymphoedema should patients be taught to report?
A feeling of heaviness or tightness in the affected arm, even before visible swelling appears, should prompt the patient to seek review. Early recognition supports earlier management and helps limit progression.
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