Keeping a Chemotherapy — Symptom Diary
Your oncologist can only act on what you can describe. A symptom diary bridges the gap between how you actually felt across the cycle and the rough impression you can recall in a clinic room two weeks later.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- A short daily record — Most entries take two to three minutes. Date, symptom, severity, and what you tried — that is enough.
- Turns impressions into information — "I felt terrible" is hard to act on. "Nausea, moderate, days two and three, mostly morning" is something your team can work with.
- Shapes every cycle after this one — Your team uses the diary to decide whether to adjust support medicines, change timing, or investigate before your next cycle.
- Takes the pressure off memory — You will not remember exactly how day five felt when you are sitting in clinic on day fourteen. The diary will.
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A chemotherapy symptom diary is a short daily record of what you experienced between cycles — which symptoms appeared, when, how severe they were, and whether anything helped. It takes a few minutes a day to fill in and gives your team the specific information they need to adjust your support and plan the next cycle well.
How do you set up and use a symptom diary?
Set it up before your first cycle begins
Write your name, your treatment centre, your start date, and your cycle length at the top. Leave a space for each day of the cycle. Ask your nurse whether your centre has a printed template — many do, and it saves you the setup.
Fill it in at the same time every day
Choose a fixed time and keep to it — most people find the evening easiest, when the day is done. Doing it at the same time each day makes it a habit and means every entry covers a comparable window.
Record what changed, not just what hurt
Write every symptom that was different from your usual — nausea, tiredness, mouth soreness, loose motions, numbness, skin changes, mood, sleep. Add a brief severity note: mild, moderate, or severe. Note the time of day it was worst.
Write what you tried and whether it helped
If you took a medicine, ate something specific, or rested more, write it down alongside whether it made a difference. This is one of the most useful parts of the diary — it tells your team what is and is not working for you personally.
Bring the complete diary to every appointment
Hand it to your nurse before you see the doctor. Do not summarise it from memory — the full diary is the point. If you kept it on your phone, show the screen or share a photograph. Good days count too; a blank row tells your team as much as a full one.
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What should you write in each daily entry?
- The date and which day of the cycle it is
- Any new symptom and approximately when it started
- How severe it felt — mild, moderate, or severe
- Whether it got better or worse through the day
- What you took or did for it, and whether it helped
- How much you ate and drank
- Your energy level compared to the day before
- Sleep — how restful it was
- Any change in bowel habit or urine colour
- Any mood, memory, or concentration changes
- A note on good days too — consistent recording is what shows the pattern
Did you know?
Systematic patient-reported symptom tracking during cancer treatment is associated with earlier detection of serious side effects and better quality of life — not just at the end of treatment, but throughout it.
The diary is the tool that makes that possible.
Source: ASCO guidance on patient-reported outcomes in oncology care
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Frequently asked questions
Why can't I just tell my doctor how I felt at the appointment?
Memory of symptoms over a two-week cycle is unreliable — not because you are not paying attention, but because the brain tends to recall peaks rather than patterns. What your team needs is the pattern: which days were hardest, whether symptoms are getting worse across cycles, and whether the medicines they prescribed for you are actually working. A diary captures that. A recall in clinic captures an impression, and impressions are hard to act on.
How detailed does each entry need to be?
One line per symptom is enough: the name, the severity, the time of day, and what you tried. You do not need to write paragraphs. "Nausea — moderate — morning — took anti-nausea tablet, helped after a couple of hours" gives your team everything they need. The goal is consistency across every day of the cycle, not depth on any single day.
What if I miss a day or two?
Fill in what you can remember and mark it clearly as a recalled entry rather than a same-day one. A partially complete diary is still far more useful than no diary at all. If you find you are regularly missing days, try a simpler format — a single severity word and the main symptom is enough to show a pattern across the cycle. The barrier to filling it in should be as low as possible.
My team seems very busy. Will they actually read it?
Your clinical team is trained to assess symptom diaries quickly — a well-kept diary takes less than a minute to scan for the pattern. More importantly, it changes the questions your doctor asks rather than replacing the conversation. Handing it to your nurse before you go in means the doctor already has the key information when they walk into the room, and the appointment can go straight to what matters.
Should I also use the diary to write down questions I want to ask?
Yes — add a questions section at the back, or at the bottom of each week. Questions written in the moment are the ones you actually remember to ask; questions held in memory often disappear the moment you sit down in clinic. Writing them alongside the symptom entries also helps your team understand what is worrying you, which is sometimes different from what the diary entries themselves show.
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