A pan-European online survey (May–August 2021) of 11,297 ME/CFS patients across 44 countries examined disease severity, course of illness, diagnostic delays, and experiences with healthcare, social support, and treatments including CBT and GET.
74% of patients reported little or no healthcare support; only 7% reported improvement over their illness course, while 46% reported mainly deterioration. Late diagnosis (≥10 years) was associated with a 54% higher risk of a deteriorating course vs. early diagnosis (≤3 years). CBT as a 'cure' was rated negatively by 75% of patients; only 5% found it positive. Pacing was rated positively by 75% of respondents. Mean diagnostic delay was 6.8 years (range: 5 years in Ireland/UK to 12 years in Croatia).
Non-random, voluntary sampling via patient organisations likely underrepresents severely ill, undiagnosed, and recovered patients. Cognitive problems were omitted from the symptom checklist by error. Causality between healthcare support and disease course cannot be established from this observational design.
Diagnose ME/CFS early and advise pacing immediately — delayed diagnosis is strongly linked to disease deterioration, and GET should be avoided. CBT used as a psychological cure for ME/CFS causes harm in most patients; if CBT is offered at all, frame it as a coping tool and only for milder cases.
