How to track a Crohn's flare so your next appointment is useful

In the middle of a flare, tracking feels like the last thing you have energy for. The point is not to be a diligent patient. It is that the decisions your team makes during a flare — whether to run a calprotectin test, arrange imaging, change treatment, or bring you in — rest on a small number of specific facts, and most of those facts only exist if you wrote them down.

What your team is trying to work out

A gastroenterologist or IBD nurse assessing a flare is usually trying to answer four questions. How bad is this compared with your usual baseline? How long has it been going on? Is this inflammation, or something that looks like inflammation — an infection, bile acid diarrhoea, a narrowing, a coincidental stomach bug? And is it getting worse, holding steady, or easing?

"I've been really bad for a few weeks" answers none of those. "Nine to eleven stools a day for the past three weeks, blood in most of them, waking twice most nights, down three kilos since the start of the month" answers all four in one sentence. You do not need clinical vocabulary. Dates and numbers do the work.

The seven things worth logging

Two more are optional but often useful: pain, rated nought to ten with a note of where it sits and whether it follows meals; and stool form, which is quicker to record with a chart than to describe. If you have not used one before, the Bristol Stool Chart takes about a minute to learn and makes your log readable to anyone in the clinic.

How to log when you feel too ill to log

Lower the bar until you can clear it on your worst day. One line per day is enough. Record at the time, or within an hour, because frequency counts reconstructed from memory at the end of the week are reliably wrong — usually low. If you miss a day, mark it as missed rather than filling in a guess. A gap is honest data. An invented day is not.

A minimum entry looks like this: Tue 14th — 8 stools, 1 overnight, blood in 3, temp 37.9 at 9pm, about 1.5 litres of fluid, all meds taken, pain 6 after lunch. That is twenty seconds of typing and it is more than most people arrive at clinic with.

One caveat worth stating plainly: a log is for showing your team, not for acting on alone. However bad the numbers look, do not start, stop or adjust any prescribed medication without speaking to your IBD team first.

One thing to skip during a flare: hunting for food triggers. When your gut is inflamed, almost everything provokes symptoms, so the associations you find now will not hold once things settle. Keep noting what you eat if it is easy, but save the analysis for a calmer stretch — a food diary finds triggers much better in and around remission.

When a flare stops being something to track

Some symptoms need same-day medical attention rather than another line in a diary. Severe or constant abdominal pain, especially with a swollen, tight abdomen, vomiting, and no wind or stool passing, can indicate an obstruction. Heavy bleeding, passing clots, or feeling faint or dizzy when you stand up needs urgent assessment. So does a temperature above 38°C with shivering, being unable to keep fluids down for several hours, or passing very little urine. Contact your IBD team's urgent line if you have one, or go to an emergency department. Do not wait for your next scheduled appointment. If you take steroids, immunosuppressants or a biologic, say so when you call — fever is treated more urgently in people on those medicines.

What to bring afterwards

When the appointment comes, resist handing over forty pages. Bring a one-page summary and keep the detail in reserve in case you are asked.

1. The date the flare started, and what you were doing or taking at the time.
2. Your daily stool count as a range, plus how many of those days included blood and how many nights you woke.
3. Highest recorded temperature and when.
4. Weight at the start of the flare and weight now.
5. Medications: what you are prescribed, what you actually took, anything you missed and why, and anything you added yourself.
6. Dates of any tests, stool samples, courses of steroids or antibiotics, and hospital or urgent care visits since the flare began.
7. Your three most important questions, written down, in priority order.

If you have time before the visit, the appointment prep guide covers how to build that summary and what else is worth taking in.

What to ask your team

• What counts as a flare for me specifically, and at what point should I contact you rather than wait?
• Can I have a written escalation plan — who to call, which number, and what to do out of hours?
• Do you want a stool sample to rule out infection before we assume this is inflammation?
• Which numbers from my log are most useful to you, so I can prioritise those next time?
• How will we know whether the current treatment is working, and by when?
• Are any over-the-counter medicines, such as anti-diarrhoeals or anti-inflammatory painkillers, ones I should avoid during a flare?
• Is there anything in my log that suggests dehydration or weight loss needs attention now?

The evidence on how much symptom diaries change outcomes is mixed, and a log is not a substitute for blood tests, stool tests or imaging — symptoms and inflammation do not always match. What a log reliably does is replace recall with record, so the ten minutes you get are spent deciding something rather than reconstructing the last two months.