Your
knowledge hub.
Five topic areas – illness context, exertion logic, pacing, lab values, and fibromyalgia – with direct answers to the questions most people ask first.
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.
Read the comparisonWhat 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 persistent symptoms started after COVID-19
Use the Long COVID guide for fatigue, brain fog, PEM, POTS, diagnosis and overlap with ME/CFS.
Open the Long COVID guideIf standing triggers palpitations, dizziness or brain fog
The POTS guide explains orthostatic intolerance, standing-test criteria and overlap with Long COVID or ME/CFS.
Open the POTS guideIf 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
For Researchers
Multimodal data collection for clinical studies and research projects.
Methodology
Energy Envelope Theory and the scientific foundations of our algorithms.
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.
Security
Encryption, GDPR compliance and data protection infrastructure.
Whitepapers
Technical documentation and peer-reviewed research behind Elara.