When Patients Say Unknown: Surgical Memory Shapes Lymphedema Information-Seeking After Breast Cancer

For millions of women who survive breast cancer surgery, the battle is far from over once the wound heals. One of the most feared long-term complications is breast cancer-related lymphedema, a chronic, progressive swelling of the arm caused by structural damage to the lymphatic system during treatment. It affects roughly 20 to 50 percent of patients, with peak onset between 12 and 30 months after surgery, and it can bring physical pain, psychological distress, and lasting economic burdens. Now, a new cross-sectional study from a tertiary hospital in Hangzhou, China, offers a strikingly simple clue about which patients are most likely to actively seek out the information they need to protect themselves: whether they can tell you how many lymph nodes were removed.

The study, led by Huan Zheng and colleagues at the First Affiliated Hospital of Zhejiang University School of Medicine and published in Supportive Care in Cancer, surveyed 196 postoperative breast cancer patients between December 2024 and January 2025. Using a convenience sampling approach, the team approached 230 potentially eligible patients and achieved an 85.2 percent response rate, with 112 participants completing paper questionnaires and 84 responding electronically through the Questionnaire Star platform. The researchers measured lymphedema-related health information-seeking behavior, or HISB, using a 43-item scale covering four dimensions: attitudes toward information-seeking, information needs, information sources, and barriers to accessing health information. They also administered a validated knowledge, attitude, and practice scale for upper extremity lymphedema prevention.

The headline numbers are revealing. The mean lymphedema-related HISB score was 178.21 with a standard deviation of 25.02, on a scale where the possible range spans 43 to 215. Because no validated interpretative threshold exists for this instrument, the authors deliberately refrained from labeling the score as low, moderate, or high, presenting it descriptively instead. Within the individual dimensions, information needs scored highest relative to their structure at 63.18, followed by information sources at 56.87, barriers at 32.13, and attitudes at 26.03. This pattern suggests that patients genuinely want to know about lymphedema, including warning signs, self-care behaviors, treatment options, and coping strategies for anxiety, but that the channels and supports available to them may not fully match that demand.

When the researchers moved from description to explanation, two factors emerged as independently associated with information-seeking in a multiple linear regression model. The first was the total KAP score: for every one-point increase in lymphedema-related knowledge, attitude, and practice, the HISB score rose by 0.850 points on average, with a standardized coefficient of 0.621 and a p-value below 0.001. The correlation between the two instruments was strong overall at r = 0.871, and when the researchers decomposed it by dimension, the practice component showed the strongest association at r = 0.837, followed by attitude at 0.785 and knowledge at 0.742. The final regression model explained 40.2 percent of the variance in HISB, a substantial share for a behavioral outcome measured at a single point in time.

The second independent predictor is the one that has captured the most attention. Patients who reported that they did not know their axillary lymph node dissection status, meaning they could not say how many nodes had been removed, scored significantly lower on information-seeking than those who reported zero nodes removed, with a regression coefficient of −15.467 and a p-value of 0.019. The authors are careful to note that this comparison pits the unknown group against a specific reference category rather than contrasting patients who were aware of their surgical history with those who were not, and that the cross-sectional design forbids any causal interpretation. Still, the signal is provocative: uncertainty about a concrete, personally relevant surgical detail travels together with reduced engagement in health information.

Why might this be? The researchers turn to the Health Belief Model, a foundational framework in health psychology that holds that people are motivated to act when they perceive a disease threat and believe in their own capacity to respond. A patient who cannot report her nodal status may lack a clear picture of her personal risk factors, and that ambiguity could paradoxically dampen her motivation to seek information, since perceived susceptibility is one of the engine blocks of proactive behavior. The authors also raise the possibility of reverse directionality: patients who are less engaged with their health in general may simply be less likely to recall or report surgical details. Unknown status, in other words, may be less a cause of disengagement than a marker of it, reflecting limited health literacy, poor recall, or insufficient communication between clinicians and patients.

One of the study’s most instructive findings is what did not survive statistical adjustment. In univariate analyses, educational level, household size, radiotherapy site, discharge instructions, axillary web syndrome, and awareness of lymphedema clinics were all associated with HISB scores, and younger patients and those from larger households tended to score higher. Yet once the KAP score entered the model, none of these sociodemographic or clinical variables retained significance. The authors interpret this attenuation cautiously, suggesting that factors like education and household support may influence information-seeking indirectly, through their effects on disease-specific knowledge and self-management practice, rather than exerting independent effects. They did not conduct formal mediation analysis, and they emphasize that longitudinal work is needed to test whether knowledge truly sits on the causal pathway. An intriguing unadjusted pattern, in which patients who received no structured discharge instructions showed higher information-seeking, hints at possible compensatory behavior, though the authors label this interpretation speculative.

The study also paints a sobering picture of the barriers patients face. Common obstacles included complex medical information, technological challenges such as unfamiliarity with the internet, and financial constraints, with 34.69 percent of participants reporting a monthly household income below 5,000 RMB and 22.96 percent living in rural townships. Inadequate family support hindered some patients’ ability to manage these obstacles, and several reported insufficient time and energy to focus on lymphedema care. Meanwhile, information provided by healthcare providers often fails to satisfy patient needs, prompting many to turn to social networks and other informal channels, where the material they find is frequently fragmented and insufficient to support sound decisions. The broader context underscores the stakes: GLOBOCAN 2024 estimates attribute approximately 2.43 million new female breast cancer cases and 694,000 deaths worldwide to the disease in 2024, and Google Trends analyses show rising public search interest in lymphedema and arm swelling after mastectomy.

The authors are candid about their limitations. The single-center design and Hangzhou-based tertiary hospital sample raise concerns about selection bias and generalizability, and the near-total female composition of the cohort, 99.49 percent, reflects breast cancer epidemiology but limits extrapolation to the small population of male patients. The cross-sectional snapshot cannot establish temporal order, and the strong correlation between the HISB scale and the practice dimension of the KAP instrument suggests some conceptual overlap that may have modestly inflated their observed association, although the substantial correlations with knowledge and attitude dimensions indicate the relationship extends beyond shared behavioral content. The study was retrospectively registered with the Chinese Clinical Trial Registry as the quantitative component of a mixed-methods investigation, and the authors report following the STROBE checklist for observational research.

Even with those caveats, the practical implications are concrete. The authors suggest that healthcare providers routinely assess whether patients can report their axillary lymph node dissection status, treating an answer of unknown not as a trivial gap in recall but as a potential flag for patients who need tailored informational support and a check on their comprehension of postoperative care. They caution, however, that simply providing more information may not suffice, since the underlying issue may be engagement rather than supply. More broadly, the findings argue for structured education that builds lymphedema knowledge as a lever for activating information-seeking, and for refining communication models so that the gap between what clinicians deliver and what patients demand finally closes. In an era when patients must assume lifelong responsibility for monitoring their own lymphedema risk after leaving the hospital, knowing what a patient does not know may prove to be one of the most powerful diagnostic tools a care team possesses.

Subject of Research: Health information-seeking behavior related to breast cancer-related lymphedema among postoperative breast cancer patients

Article Title: Current status of lymphedema-related health information-seeking behavior and its associated factors among postoperative breast cancer patients: a cross-sectional study

Article References: Zheng, H., Chen, F., Wang, L., Cao, K., Zhao, X., & Shao, L. (2026). Current status of lymphedema-related health information-seeking behavior and its associated factors among postoperative breast cancer patients: a cross-sectional study. Supportive Care in Cancer, 34(11), Article 1091. https://doi.org/10.1007/s00520-026-11322-5

Image Credits: AI Generated

DOI: 10.1007/s00520-026-11322-5

Keywords: breast cancer, lymphedema, health information-seeking behavior, axillary lymph node dissection, health literacy, patient education, health belief model, self-management, cross-sectional study, supportive care, nursing, cancer survivorship