Recognizing the Symptom Patterns Behind a Low Disease Activity Score

Key Takeaways:

• In the 2026 Sjögren's In America survey, 38% of 994 patients rated their quality of life fair, 9% rated it poor, and physical health was their highest-ranked worry.
• Patients cluster into 4 reproducible symptom subgroups that do not differ by systemic disease activity score – a low score is not evidence of low burden.
• Five patient-reported measures identify a patient's subgroup, and those subgroups differ in salivary flow, serology, and lymphoma prevalence.

A rheumatology follow-up in Sjögren's disease usually generates a systemic activity score. The EULAR Sjögren's Syndrome Disease Activity Index (ESSDAI) was developed as one of 2 paired instruments: a systemic activity index covering 12 organ domains, alongside a patient-administered questionnaire assigned to the dryness, pain, and fatigue that patients report themselves.¹

That division of labor matters at the bedside, because what patients describe as their burden sits largely on the second axis. The question is not whether the activity score is accurate. It is what the score was built to detect, and what a clinician can collect alongside it.

What patients rank highest

Among 994 patients diagnosed with Sjögren's in the 2026 Sjögren's In America survey, fair was the single most common quality-of-life rating at 38%, with a further 9% rating it poor.²

Physical health was the standout concern: 51% reported high worry about it (the top 2 points on a 1 to 7 “Not At All” to “A Lot” scale) – more than double the proportion reporting high worry about mental health, and above every access and affordability item in the same battery.²

Asked in an open-ended question what makes managing their health hardest day-to-day, patients answered in a consistent register. Pain appeared in roughly 37% of responses and fatigue in roughly 35%, frequently in the same answer. Symptom unpredictability appeared in roughly 11%.²

Dryness – the condition's defining feature – appeared in roughly 2%. One respondent put the resulting clinical gap plainly, writing that providers "just want to try and manage inflammation" and that "just because labs look 'okay' doesn't mean the patient feels well.”²

The same priority shows up in what patients ask for: Symptom management and pain management were the 2 most requested content areas, at 61% and 59%.²

Four reproducible symptom subgroups

This is not simply a reporting-style difference. Unsupervised hierarchical clustering of 5 patient-reported measures – pain, fatigue, and dryness from the EULAR Sjögren's Syndrome Patient Reported Index (ESSPRI), plus anxiety and depression from the Hospital Anxiety and Depression Scale (HADS) – produced 4 distinct subgroups in 608 UK patients, then replicated them in independent French and Norwegian cohorts totaling 396 patients, or 1,004 across all 3. Pooled across the 3 cohorts, pain-dominant with fatigue was the largest subgroup at 39%, followed by high symptom burden at 24%, low symptom burden at 19%, and dryness-dominant with fatigue at 18%.³

The finding that matters clinically is what did not differ. The authors report no statistically significant differences in age, sex, disease duration, or ESSDAI between the subgroups, and when they attempted to stratify the same patients by systemic activity instead, the symptom-based grouping produced a better goodness-of-fit and detected more transcriptomic differences between groups.³

The subgroups were not merely symptomatic labels either: The dryness-dominant group had the lowest unstimulated salivary flow and the highest lymphoma prevalence, at 10.8% against 1.7% in the low-symptom-burden group. Serology does not separate them, though – anti-SSA and anti-SSB positivity was comparably high in both of those subgroups, and the least symptomatic group carried the highest serum immunoglobulin G and the highest interferon-related gene activity. It is the symptom measures, not the laboratory profile, that distinguish the groups.³

Longitudinal data point in the same direction. In 377 patients followed for a median of 2.1 years, a high patient-reported index predicted deterioration in health-related quality of life (hazard ratio 2.02, 95% CI 1.6–2.6), while baseline ESSDAI did not; 16% declined to a health state at or worse than death.⁴

In the largest US cohort available, in patients without a second rheumatic diagnosis – 277 patients compared with 606 controls – somatic fatigue was the only unique predictor of general health, and physical functioning was predicted by pain severity, somatic fatigue, and age. Sicca severity and disease duration contributed to neither. Fatigue in particular has been reported as not associated with systemic disease activity.^5,6

Five measures worth collecting

The practical implication is narrow and usable. Subgroup assignment requires 5 patient-reported numbers and no laboratory work: pain, fatigue, and dryness on 0 to 10 scales, and anxiety and depression on the 0 to 21 HADS scales. A patient reporting high pain and fatigue alongside a low activity score is not a well-controlled patient – that combination is the modal presentation in these cohorts, not an outlier.³

Two limits belong in any use of this framework. The subgroups are descriptive and prognostic. A post-hoc reanalysis of 2 negative trials suggested that treatment response may differ by subgroup, but those trials were not powered for stratified analysis, and the finding requires validation. And in the longitudinal cohort where activity score showed no relationship to quality-of-life decline, the median ESSDAI was 2.0 – so the claim is about patients with low systemic activity, not about systemic activity being irrelevant.3,4
The takeaway is simple: A low activity score reflects organ involvement, not how a patient feels – and in Sjögren's, that gap is where most of the burden lives. Patients sort into 4 stable symptom subgroups that look identical on paper yet differ in salivary flow, lymphoma risk, and quality of life over time. Identifying a patient's subgroup takes no extra labs, just 5 self-reported numbers: pain, fatigue, dryness, anxiety, and depression. High pain and fatigue next to a low score is not a case slipping through the cracks – it is the most common way the disease presents. Those 5 measures turn "the labs look fine" into a fuller picture of the person in front of you.