Persistent fatigue lasting six months or more that is not relieved by rest and limits daily activity.
✦ AI summary
Research on chronic fatigue, including myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), shows it's a complex condition with fatigue levels that can be as severe as, or even higher than, other serious illnesses like cancer or chronic pain conditions [1]. Scientists are exploring many possible biological contributors, including changes in gut bacteria and related inflammation [2][4], differences in tiny cell-signaling particles in the blood [8], DNA chemical markers that might link ME/CFS with similar conditions like long COVID and fibromyalgia [5], and heart/blood vessel related issues affecting exercise tolerance, though blood volume itself didn't explain orthostatic symptoms in one study [10][12]. In adolescents, ME/CFS is linked with slower information processing, poorer sleep, and higher anxiety/depression compared to peers [11]. On the social side, getting a diagnosis for these fatigue-related conditions is often described as uncertain and complicated, affecting patients' ability to access support and sometimes bringing stigma [7]. In terms of treatment, one study found an intensive multidisciplinary rehabilitation program didn't significantly improve physical funct
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