Guide
How to keep a health diary without it taking over your life.
Last checked: 27 September 2026
A health diary is a record of how your days actually go. It is not a project, it is not a spreadsheet with forty columns, and it is not something you have to be good at. On the days it matters most you will have the least energy for it, so the only health diary worth keeping is one you can still fill in on a bad day.
This is how to keep one that stays useful, and what it can honestly tell you afterwards.
What a health diary is actually for
Two things, mostly. The first is memory. By the time an appointment comes round, six or eight weeks have usually passed, and the difficult week in the middle has blurred into all the others. A health diary gives you the dates back.
The second is pattern. Not cause, pattern. A record kept over a few weeks can show that your hardest days cluster at the end of the week, or that a symptom turned up three times rather than the once you remembered. That is worth noticing. It does not mean that one thing caused another.
A health diary is not a medical record and nothing in it replaces talking to your doctor.
The five things worth writing down
Most people start by recording far too much and stop after nine days. These five cover almost everything a doctor is likely to ask you.
- The date, and one overall word for the day. Good, okay or hard is enough.
- Which symptoms turned up, and roughly how strong each one was. A number out of ten is fine.
- What it stopped you doing. This is the one people leave out, and it is the one that carries the most weight in an appointment.
- Anything you took, and when.
- Anything that seemed to help, or seemed to set it off. Write it down as a question, not as a conclusion.
How long it should take
About a minute. If it is taking ten, it will not survive a flare, and a health diary with a three week hole in the middle is worth a good deal less than a sparse one that runs the whole way through.
On the worst days, write one line. The date and one word. That is still a real entry, and it is often the most important one, because the hard days are the ones you will want a record of later.
Paper or phone
Both work. Paper is easier to start, and harder to drift away from, because it is physically in front of you. A phone is easier to keep up on a bad day, because it is already in your hand, and it can add the days up for you.
If you want paper, there is a free printable health diary here: one week to an A4 page, no sign up and nothing to download. If you would rather do it on a phone, that is what taluvu is.
What a health diary can and cannot show you
It can show you how often something happened, when it happened, and what your days looked like around it. That is genuinely useful, and it is the kind of thing a doctor can work with.
It cannot tell you why. A diary showing that your headaches were worse in the three weeks you slept badly has given you a coincidence worth mentioning, not a cause. Take it as a question to ask, and let the person with the training answer it.
Taking it to an appointment
Do not hand over eight weeks of raw pages. There is rarely time to read them, and the parts that matter get lost in the rest.
Bring a short summary instead: how many hard days there were, which symptoms were worst, what they stopped you doing, and what has changed since last time. The guide on preparing for a GP appointment covers what to say, and there is an example of what a summary looks like.
Questions people ask
How long should I keep a health diary before it is useful?
Two weeks will usually show you something. Six to eight weeks is normally enough to show a pattern, and it happens to line up with how long people often wait between appointments.
What if I miss days?
It still counts. A record with gaps is completely normal and a doctor will not be surprised by it. The missing days are information in themselves, because people usually miss the hardest ones.
Is a health diary the same as a symptom tracker?
Close enough in practice. A symptom tracker usually suggests an app with structured fields, and a health diary suggests something more written, but both are a record of how your days go. Use whichever word suits you.
Will my doctor actually look at it?
More likely if it is short. A single page that can be read in thirty seconds tends to get used. A folder of printouts usually does not.
Where to go next
- How to prepare for a GP appointment
- How to describe symptoms clearly to a doctor
- How to keep track of a flare
- What to include in a symptom summary for your doctor
- Print a one-week symptom diary
- Condition pages, with the symptoms people usually start with
- The taluvu symptom tracker app, step by step
Keeping the record without the work
taluvu is a chronic illness tracker app for iPhone. It records how the days actually go, in about a minute a day, and turns that into something you can take to an appointment. It is on the App Store as Taluvu Chronic Illness Tracker.
Taluvu Chronic Illness Tracker
TALUVU LTD · Health and Fitness · iPhone
Free to download, with a Taluvu Pro subscription inside
Nothing on this page is medical advice. If you are worried about your health, contact your GP practice or NHS 111. In an emergency ring 999, and if you are struggling to keep yourself safe, Samaritans are on 116 123.