Do labels matter? Implications of ongoing symptomatic chronic illnesses labeled as conventional diagnoses vs. functional somatic syndromes.

Minimal differences were found in illness representations across FSS and CD groups with distinctions found only for illness coherence and identity. Illness coherence stands out as particularly important for coping and health-related quality of life for individuals with ongoing symptoms. Healthcare professionals should work carefully with chronically ill populations to address potential impacts of illness coherence, especially among FSS patients.