How to Keep a Bladder Diary: What to Record, for How Long, and Why It Matters

A bladder diary is a written record, kept for at least three days, of every time you pass urine or leak, how much, what you drank and what you were doing at the time, and NICE recommends it as part of the initial assessment of women with urinary incontinence or overactive bladder.¹ It turns “I go all the time and I leak sometimes” into numbers that someone can read in five minutes and act on.

The first appointment where anybody measured my symptom was the one that changed things, and the diary I took to it was the reason it went quickly. I had kept one for three days on a clipboard in the bathroom, with a plastic measuring jug from the kitchen drawer that I have never used for cooking since. It felt faintly ridiculous at the time. It was also the first document in three years of appointments that described what was actually happening rather than how I felt about it. This page is how to keep one properly, checked by a specialist pelvic health physiotherapist.

What the guideline actually says

NICE NG123 recommendation 1.3.13 says to use bladder diaries in the initial assessment of women with urinary incontinence or overactive bladder, and to encourage women to complete a minimum of 3 days covering variations in their usual activities, such as both working and leisure days.¹ The recommendation carries a [2006] tag, meaning it was carried forward from the older guideline rather than re-reviewed in 2019, but it has not been contradicted since.

Two details in that wording matter more than they look. “Minimum” means three days is the floor, not the target, and a clinician may ask for more. And “covering variations in usual activities” means the diary should include the days on which your symptoms happen. My leaking was worst on running days and on long teaching days with no break between lessons. A diary kept over a quiet weekend at home would have described somebody much better than me.

The next recommendation, 1.3.14, says not to use pad tests in routine assessment.¹ That is part of why the diary carries so much weight at a first appointment: in routine practice it is the main way the symptom gets counted.

The five things to record

Each entry needs five pieces of information: the time, the volume passed, what you drank since the last entry, whether you leaked and what triggered it, and how strong the urge was. Most clinic forms use these columns or something close to them.

Column	What to write	Why it matters
Time	The clock time of each void or leak	Shows frequency and spacing through the day and night
Volume	Millilitres passed, measured in a jug	Separates many small voids from a few large ones
Drinks	Type and amount since the last entry	Links what goes in to what comes out, and shows caffeine and alcohol
Leaks	Yes or no, roughly how much, and what you were doing	Separates leaking on effort from leaking with urgency
Urge	A simple rating, such as none, mild, strong, could not wait	Shows whether urgency is driving the pattern

Add the time you went to bed and the time you got up. That single line lets the person reading it separate night-time voids from daytime ones, which matters if waking at night is part of the problem; getting up at night to wee explains why.

If you wear pads, note when you change one and whether it was damp, wet or soaked. It is a rough measure, but it is a measure.

How to measure without it taking over your life

The usual method is a cheap plastic measuring jug kept in the bathroom, used for every void you can reasonably catch on the diary days. You sit or stand as normal, pass urine into the jug, read the volume, tip it away, rinse the jug and write the number down. It takes under a minute once you have done it twice.

Away from home it gets harder, and that is fine. Write the time and leave the volume blank, or put a dash, rather than estimating. A guessed number looks exactly like a measured one on the page and can mislead the person reading it. A blank is honest.

Keep the sheet and a pen next to the toilet rather than in another room, because the entries that get forgotten are the ones you mean to write up later. I wrote night-time entries on a sticky note on the bedside table and copied them over in the morning, which worked better than trying to find a clipboard at three o’clock.

The mistakes that make a diary hard to read

The commonest mistake is changing your habits for the three days, which produces a tidy diary that describes someone else. People drink less, skip coffee, stay home, or avoid the activity that makes them leak. The diary is meant to show an ordinary day, so drink and live as you normally would.

The other mistakes are smaller but add up:

• Leaving out volumes. A list of times alone shows frequency but not why. Volumes carry the most information.
• Writing summaries instead of entries. “Went about ten times” is a description, not a record.
• Forgetting the drinks. Without them, a day of frequent voids could be a bladder problem or simply a day with a lot of tea.
• Missing the trigger. “Leaked” is less useful than “leaked on a sneeze” or “leaked with a sudden urge on the way to the toilet”.
• Picking easy days. Include at least one day of the kind that causes you problems.

None of these is a disaster. A diary with gaps is still far more useful than none. But a clean, honest three days will save you a second round of keeping one.

What the diary shows the person reading it

A good diary lets a clinician see, in a few minutes, how often you go, how much you pass, how much you drink, when you leak and why, and whether urgency is driving the pattern. That separates problems that feel similar but are treated differently.

Leaking on a cough, a sneeze or a lift points towards stress urinary incontinence. Leaking with a sudden urge that cannot be put off points towards urgency. Many people have both. In the Norwegian EPINCONT survey of 27,936 women aged 20 and over, of those who reported leakage, half had stress type, 11% urgency type and 36% mixed.² NG123 asks clinicians to categorise incontinence as stress, urgency or mixed at the initial assessment,¹ and the diary is one of the main ways they do it.

That category decides the order of treatment. Supervised pelvic floor muscle training is first line for stress and mixed incontinence; bladder training, which is built from the diary, is the first line approach for urgency. Bladder training and fluid advice explains how a diary becomes a programme, and what happens at a pelvic health physio assessment covers where it fits into the first appointment.

Keeping a second diary later

A diary kept at the start is a baseline, and a second one kept weeks into a programme is one of the clearest ways to see whether anything has changed. Squeeze strength readings describe the muscle; the diary describes the symptom, and treatment is judged on the symptom.

NICE NG210 asks for at least one review during a supervised programme and one at the end,³ and a fresh three day diary before each review gives that appointment something concrete to compare. My own second diary, at about ten weeks, was the first piece of evidence that the programme was working, before I could feel any difference myself. How pelvic floor progress is measured goes into the other measures in more detail.

What a diary cannot do

A diary records a symptom; it does not diagnose one, and some symptoms are not diary questions at all. Blood in the urine, new bladder or bowel problems with back pain or numbness in the saddle area, being unable to pass urine, or a fever with pain in your side need a clinician first, not three days of record keeping.

The full standing list is on pelvic health red flags, and reading it before starting a diary is the right order. For everything else, three ordinary days with a jug and a pen is the most useful thing you can do before anybody sees you. The international standardised terms that clinicians use for what you are recording come from the International Continence Society,⁴ which is why a well kept diary reads the same in any clinic you take it to.