Track ME/CFS and Find the Edge of Your Energy Envelope

What to track when you have ME/CFS

The aim is not a complete record of every bad hour. It is enough signal to see where your limit sits and what pushed you past it.

• Fatigue, logged daily at mild, moderate or severe, gives you a baseline so you can tell a normal bad day from a slide into a longer downturn.
• Post-Exertional Crash is the diagnostic core of ME/CFS, and logging the day it starts (not the day of the activity) is what lets you count backwards to the trigger.
• Reduced Daily Function captures what you actually could not do, which is the measure clinicians and benefits assessors use rather than how tired you felt.
• Unrefreshing Sleep separates ME/CFS from ordinary tiredness, because waking unrestored after adequate hours is a distinct feature and worth recording even on a good day.
• Brain Fog often crashes on a different curve from your body, and tracking it shows whether reading, admin or conversation is costing you more than walking.
• Fainting / Lightheaded flags orthostatic intolerance, common in ME/CFS and often treatable, and a pattern of standing-related symptoms is what prompts testing.
• Headache frequently rises during the crash window and can be one of your earliest warning signs.
• Muscle Aches after trivial exertion, sometimes hours later, help distinguish post-exertional malaise from simple deconditioning.
• Joint Pain tracked over months shows whether pain is a fluctuating part of your ME/CFS or something new that needs separate assessment.

Exertion, rest and the factors that move your baseline

In ME/CFS the useful factors are the ones that spend energy or protect it, and both count.

• Physical Activity, logged honestly rather than aspirationally, is the input you correlate against crashes two or three days later. Graded exercise therapy is no longer recommended for ME/CFS, so this is for mapping your ceiling, not for climbing it.
• Cognitive Effort counts as exertion in this illness. A long phone call, a form, a difficult conversation, all of it can trigger the same delayed crash as a walk, and people routinely miss this because they were sitting down.
• Rest & Pacing is the intervention with the best support in ME/CFS. Logging pre-emptive rest, not just collapse, is how you find out whether resting before an event actually reduces the cost of it.
• Poor Sleep tracked alongside unrefreshing sleep separates a disrupted night from the ME/CFS pattern of long, unrestorative sleep, which matters if a clinician is considering sleep apnea or a sleep study.
• Stress affects autonomic function and symptom load in ME/CFS. Recording it does not mean the illness is psychological, it means you can show that crashes follow exertion, not just difficult weeks.
• Daily Medications covers low-dose naltrexone, amitriptyline or duloxetine for pain, beta blockers, ivabradine, fludrocortisone or midodrine for orthostatic symptoms, and antihistamines. Dated logs show whether a trial helped or coincided with a good spell.

Why the crash never lines up with the cause

Post-exertional malaise in ME/CFS is typically delayed by twelve to seventy-two hours. That gap is the single reason tracking works better than memory. On the day you did too much you often felt fine, sometimes unusually good, so when the crash lands two days later it feels random or attributable to whatever happened that morning. Only a dated timeline, with exertion logged on one line and symptoms on another, makes the lag visible. Most people need six to eight weeks before the shape appears, and three months before they trust it enough to change what they do.

The second pattern takes longer. Over three to six months you start to see the difference between a short crash you recover from in a few days and a rolling decline where each recovery lands lower than the last. That distinction is what tells you your envelope has shrunk and your baseline needs resetting, and it is almost impossible to see from inside a single bad week.

Preparing for a specialist or reassessment

Whether you are seeing a general practitioner, an ME/CFS or long COVID service, a rheumatologist or a cardiologist about orthostatic symptoms, the questions are consistent. How long has this lasted, is there post-exertional malaise and how delayed is it, how much function have you lost, does rest restore you, do symptoms worsen on standing. Those are all answers you have already recorded rather than reconstructed under pressure.

A doctor-ready PDF from Trace Health turns that into dated evidence: crash frequency over months, the exertion that preceded each one, how many days you were housebound, and what changed after a medication started. For people who have spent years not being believed, having the record on paper changes the tone of the appointment. It also spares you the exertion of narrating your history, which is itself a cognitive load that can cost you the following week.

Frequently asked questions

How do I track post-exertional malaise when the crash comes days later?

Log the exertion on the day it happens and the crash on the day it starts, and let the app hold both. Do not try to link them in the moment. In Trace Health, [[l:physical_activity|physical activity]] and [[l:cognitive_effort|cognitive effort]] sit on the same timeline as [[s:post_exertional_crash|post-exertional crash]], so after several weeks you can scroll back from a crash and see what sat twelve to seventy-two hours before it. The lag is usually consistent for a given person, which is what makes it predictable.

How many weeks of logging before ME/CFS patterns show up?

Expect six to eight weeks for the delay between exertion and crash to become visible, because you need several crashes to compare rather than one. Three months gives you a usable picture of your energy envelope and your typical recovery time. Six months is where you can see whether your baseline is stable, improving or drifting down. If you miss days, that is normal in this illness and does not ruin the record. Severity taps on your worst days are worth more than detailed entries you cannot manage.

Can I give my doctor the record without a long explanation?

Yes. Trace Health exports a doctor-ready PDF with dated symptom entries, severity levels and the lifestyle factors logged alongside them, in charts over weeks or months. You can hand it over or email it before the appointment. Clinicians tend to read a frequency chart faster than a paragraph, and for ME/CFS the useful pages are usually crash frequency, [[s:reduced_daily_function|reduced daily function]] over time, and the medication timeline. It is a record you produced, not a diagnosis the app made.

Is my data private, given how often people with ME/CFS are disbelieved?

Your logs stay on your iPhone by default, with optional private iCloud sync to your own account. There is no Trace Health account, no sign-up, and nothing is uploaded to a server for analysis. That matters when a record touching on function, work capacity and insurance is involved. You decide what leaves the phone and when, by generating a PDF and sharing it yourself. Nothing is shared automatically with any clinician, employer or insurer.

Should I be tracking to increase my activity over time?

No. Graded exercise therapy is no longer recommended for ME/CFS, and tracking here is for finding your ceiling rather than raising it. The point of [[l:rest_pacing|rest and pacing]] logs is to see which activity levels you can repeat without a crash, and to catch the point where you are borrowing against tomorrow. If your record shows crashes clustering after a certain level of exertion, the useful response is to stay under it, not to push through it. Discuss any activity plan with your clinician.