Global assessment of fatigue impact.
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The Fatigue Severity Scale (FSS) is a widely utilized, nine-item psychometric scale designed to quantify the impact and severity of fatigue on an individual's daily life. Each item is rated on a 7-point Likert scale, ranging from 1 (strongly disagree) to 7 (strongly agree), assessing how fatigue interferes with physical functioning, daily activities, and motivation. The total score, ranging from 9 to 63, helps clinicians and researchers evaluate the level of fatigue experienced, identify potential functional limitations, and monitor treatment effectiveness. It is particularly valuable for individuals experiencing chronic fatigue associated with various medical conditions, providing a standardized measure for clinical assessment and research.