[Chronic pain syndrome in musculoskeletal diseases-how different are fibromyalgia and long COVID?-Part 2].

Acute and chronic pain play an important part in the care of patients with musculoskeletal diseases. For rheumatologists this represents a frequent challenge. For the management of chronic pain conditions in rheumatology those that cannot be explained by objective tissue damage are particularly important-which makes patients' subjective assessment of pain a central building block of the diagnosis. For the diagnosis of fibromyalgia (FM) standardized questionnaires such as the Widespread Pain Index (WPI) and the Symptom Severity Score (SSS) are used. In connection with the recent global SARS-CoV‑2 pandemic protracted courses and health problems have been described, which have been termed long COVID syndrome and have some similarities but, as is shown in the following, also demonstrate some differences from FM. There has recently been an interesting scientific controversy that culminated in a pros and cons session at the EULAR congress 2024, following several publications. The arguments and citations exchanged have served as the basis for the overview produced here, which is intended to offer rheumatologists confronted with such clinical pictures assistance with the assessment of these diseases, even if the results of the studies presented are definitely controversial.