What should you put in a symptom diary?

Start with what you can describe: what you noticed, when it started, how long it lasted and what you were doing. MedlinePlus recommends preparing a description of symptoms, including their onset and what seems to make them better or worse, before speaking with your health professional.

Keep an observation separate from an explanation. “I noticed this while working” describes context. Saying that work or a medicine caused the symptom requires a different assessment. You can bring that possibility to the appointment as a question without recording it as an established fact.

A simple way to keep useful notes

  1. Use one entry per event. Choose words you will understand when you read them later. If you are writing from memory, label the time as approximate.
  2. Describe the practical impact. Note whether you stopped an activity or changed your plans. This adds detail to broad descriptions such as “a difficult day”.
  3. Add the context you have. Mention relevant changes in your routine. If you include a medicine, use the time you actually recorded rather than filling gaps with assumptions.
  4. Finish with a question. Write the main thing you want to understand in one sentence you can read aloud during the visit.

One sheet for each episode, with room to write. If you copy it into a notes app, repeat the record for the next episode.

Symptom diary: one record per episode

Date and time (exact or approximate)
Duration
What I noticed
Effect on my daily routine
Context: what I was doing and what seemed to help or worsen it
My question for the appointment

This record does not establish causes. Do not wait to finish the diary before seeking care when you need it.

Review your notes without trying to diagnose

Before the visit, choose the entries that best explain your concern. Keep the other entries available in case you need details. Preserve the dates and mark anything uncertain. If you missed a day, leave the gap visible: no entry does not mean that you had no symptoms.

Avoid rewriting notes to make days look more similar or more different. The aim is to describe your experience, including occasions when there is no clear pattern.