What is ME/CFS and how is it different from burnout or depression?
This answer page explains the distinction directly and then leads into the broader illness framework.
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Five topic areas – illness context, exertion logic, pacing, lab values, and fibromyalgia – with direct answers to the questions most people ask first.
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What is PEM and why can symptoms get worse later?
This page answers directly why PEM often becomes obvious only hours or days after exertion.
Understand the delayWhat does pacing actually mean in daily life?
The entry point leads straight into practical first steps for routines, buffer time, and limits.
See the first stepsWhen do lab values help with fatigue and when do they stop being enough?
This guide interprets the main markers directly and shows when symptom course matters more than any single value.
Interpret the lab valuesWhen symptoms worsen after exertion
Start with the direct distinction between PEM and ordinary post-activity exhaustion.
Interpret PEMWhen you want practical pacing help
This page translates exertion logic into planning, buffer time, and routines you can actually use.
Start pacing practicallyWhen labs are the first lead
Read the main markers in context before over-interpreting single values.
Read labs in contextIf brain fog is the symptom you are trying to understand
Start with the Brain Fog guide for concentration, word-finding, memory and processing-speed problems, including ME/CFS, Long COVID and urgent neurological context.
Open the Brain Fog guideIf you want to structure an ME/CFS-like symptom pattern
Use the free ME/CFS symptom check to organize symptoms against established criteria. It is for orientation and does not provide a diagnosis.
Open the ME/CFS symptom checkMore Research
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Multimodal data collection for clinical studies and research projects.
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ME/CFS
Foundations, symptoms, differentiation, and everyday illness context.
PEM
Delayed worsening after exertion, early warning signs, and common patterns.
Pacing
Practical load management for more stable daily life.
Fatigue & Lab Markers
Read ferritin, vitamin D, B12, and fatigue-related lab questions in symptom context.
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