Fatigue, one of the most pervasive and disabling symptoms of systemic lupus erythematosus (SLE), continues to challenge both patients and clinicians, with nearly 80–90% of individuals affected and more than half describing it as their most debilitating complaint. Despite its high prevalence, the biological mechanisms driving fatigue in SLE remain poorly understood, limiting the development of targeted therapies and leaving many patients with unmet clinical needs.
Traditional markers used to monitor lupus, including disease activity indices and laboratory parameters, have shown inconsistent associations with fatigue severity. This disconnect has led researchers to increasingly explore non-inflammatory contributors such as organ damage, metabolic factors, and psychosocial influences. Identifying reliable biomarkers of fatigue is now considered a key research priority, as it could help clarify its pathogenesis and guide more effective interventions.
A recent study published in BMJ Open provides important new insights, suggesting that fatigue in SLE may be more closely linked to cumulative organ damage and patient-related factors rather than active disease. The prospective, cross-sectional observational study evaluated 183 consecutive patients attending a tertiary care rheumatology clinic, with a majority drawn from ethnic minority populations. Fatigue was assessed using the Fatigue Severity Scale (FSS), where a score of 4 or higher indicates clinically significant fatigue. More than half of the cohort (52%) met this threshold, underscoring the substantial burden of the symptom. Disease activity was measured using the SELENA-SLEDAI score, while long-term organ damage was quantified using the SLICC/ACR Damage Index.
The findings revealed that patients with significant fatigue had higher levels of accumulated organ damage, particularly pulmonary fibrosis and neuropathy, as well as higher body mass index (BMI). In contrast, no meaningful association was observed between fatigue and disease activity scores, reinforcing the growing consensus that fatigue in lupus is not simply a reflection of ongoing inflammation. Demographic differences were also observed. Patients with fatigue were more likely to be White, while Black patients were more frequently represented in the non-fatigued group. Although the reasons for these differences remain unclear, experts suggest that genetic predisposition, socioeconomic factors, access to care, and cultural perceptions of symptoms may all play a role.
The study aligns with a broader body of research indicating that fatigue in SLE is multifactorial. Beyond organ damage and metabolic factors, previous studies have implicated chronic pain, sleep disturbances, depression, and physical deconditioning as important contributors. Emerging evidence also points toward the role of neuroinflammation, cytokine dysregulation, and altered central nervous system signaling in the persistence of fatigue.
These findings suggest that managing fatigue in lupus may require a more holistic and multidisciplinary approach rather than a sole focus on controlling disease activity. Interventions such as structured exercise programs, cognitive behavioral therapy, weight management, and treatment of comorbid conditions like depression and sleep disorders have shown benefit in some patients. Longitudinal studies across diverse populations, along with mechanistic research, are needed to better understand causal pathways and identify actionable therapeutic targets.
As research continues to evolve, fatigue in SLE is increasingly being recognized not merely as a secondary symptom, but as a complex and independent clinical domain. Addressing it effectively will require a shift in both research focus and clinical care strategies, with greater emphasis on patient-centered outcomes and quality of life.
References
- Chapman M, Rizvi AM, Qutab M, Munday A, Biehl A, Manna Z, Hasni S. Factors associated with fatigue in patients with systemic lupus erythematosus in an outpatient tertiary care setting: a cross-sectional cohort study. BMJ Open. 2026 Apr 1;16(4):e104786.
- Mahieu MA, Ramsey-Goldman R. Candidate Biomarkers for Fatigue in Systemic Lupus Erythematosus: A Critical Review. Curr Rheumatol Rev. 2017;13(2):103-112.