How to start a symptom diary you'll actually stick with

By Petr Nezval, developer of Symp Trac · Updated July 2026 · 4 min read · Not medical advice

Most symptom diaries die in week two — not because tracking doesn't work, but because the diary asked for too much. A useful diary is built around three decisions.

1. Track three things, not thirteen

Pick the one symptom that bothers you most, one thing you suspect matters (sleep, stress, a food group), and one "how was the day" measure like mood or energy. Three metrics take under a minute a day; thirteen take a spreadsheet and your will to live. You can always add more once the habit holds.

2. Use a scale, not an essay

A 0–10 severity number beats a paragraph. Numbers can be graphed, compared and shown to a doctor; paragraphs get skimmed. Keep a short note field for context — "before storm", "skipped lunch" — but let the number carry the day.

3. Anchor it to something you already do

Diaries survive when they piggyback on an existing habit: with your evening teeth-brushing, with the morning coffee. The entry itself should take two taps — that's the bar a tool has to clear on your worst day, because worst days are exactly the ones worth recording.

What "useful" looks like a month later

After ~30 days you want to answer three questions at a glance: Is it getting better or worse? Which days were bad, and did they cluster? Did the thing I suspected actually line up with bad days? A monthly graph answers the first two; for the third, see finding your flare triggers — and before an appointment, read how to show the diary to your doctor.

Track it in Symp Trac — a private symptom diary for iPhone & Apple Watch. Two-tap logging, a month on one screen, doctor-ready reports. No account, no ads; the core diary is free.

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