Purpose <p>To explore the experiences and opinions of women with breast cancer-related arm lymphoedema (BCRL), a common sequela of breast cancer treatment, and of lymphoedema practitioners regarding current lymphoedema treatment in the UK, priority outcomes and assessment methods, and acceptability of a future trial of lymphoedema treatment and use of intensive-decongestive lymphoedema treatment (DLT) for women presenting with BCRL.</p> Method <p>Two focus groups were conducted with 13 women and three focus groups with 13 lymphoedema practitioners. Discussions were transcribed and analysed using framework analysis.</p> Results <p>Usual UK lymphoedema care was self-treatment with hosiery. Women and practitioners supported the notion of early intervention although practitioners reported lack of capacity to provide intensive-DLT. All groups considered arm volume an important outcome but were unsure what treatment outcomes could be expected. Participants supported the need for a trial to identify effective treatment for women with previously untreated BCRL but could not describe criteria for a good clinical outcome.</p> Conclusions <p>Study findings demonstrate the need and desire of women and practitioners for robust research to determine the most effective treatment for women with early-BCRL, that is, within 12 months of BCRL onset,&#xa0;including intensive-DLT. However, UK lymphoedema services lack capacity to provide intensive-DLT, so the potential to conduct a future trial of effectiveness is likely to be limited.</p> Implications for Cancer Survivors <p>Women with arm BCRL can expect to receive self-treatment with hosiery. There is a need to identify effective treatment for women with arm lymphoedema and criteria for a good clinical outcome.</p>