Purpose <p>Health-related quality of life is a key outcome for patients with high-impact chronic pain, and the PROMIS-10 Global Health questionnaire is widely used to assess it. This study examined what patients perceive as important changes in PROMIS-10 Global Health items by 1) 1) examining how much each item should change to be perceived as important, and 2) exploring why and how these changes were considered important.</p> Methods <p>Individual semi-structured interviews with 17 participants with high-impact chronic pain were conducted. Analysis for objective one involved determining item-level thresholds for important change by aggregating participants’ reported change scores for each item. Analysis for objective two involved thematic analysis to explore how and why such changes were perceived as important.</p> Results <p>For items rated on a 5-point Likert scale, change scores perceived as important ranged from a mean of 1.09 (median = 1) for item 1 (general health) to a mean of 1.84 (median = 2) for item 8r (fatigue). For item 7r (pain intensity), rated on a 0–10 scale, a mean change score of 4.36 (median = 4.25) was considered important. Thematic analysis identified one to two themes per item, reflecting perceived important improvement across physical, mental, and social health.</p> Conclusion <p>This is the first qualitative study to explore what patients with high-impact chronic pain perceive as important changes in PROMIS-10 Global Health items. Findings reflect important improvements across physical, mental, and social health, highlighting the value of patient perspectives in clinical use. Further qualitative research is needed to enhance interpretation and inform clinical applications.</p>