Most people with recurring headaches treat them the same way: wait for one to arrive, take something, and get on with the day. It works well enough that the bigger question never gets asked. Why do they keep coming?
A headache diary is the cheapest, lowest-tech tool for answering that. It takes about a minute a day, and after two to four weeks it often tells you more than a single appointment can. Here is why it matters and how to do it in a way that produces useful information rather than just a list of bad days.
Why patterns matter more than any single headache
"Headache" is not one condition. The international classification lists well over a hundred types, but in practice most recurring headaches fall into a few groups: migraine, tension-type headache, headaches that arise from the neck (cervicogenic), and headaches related to medication use.1 These behave differently and respond to different things.
Migraine tends to be one-sided and throbbing, often with nausea, sensitivity to light or sound, and a strong tendency to make you want to lie down. Tension-type headache is usually a band-like, pressing ache on both sides without those features. Cervicogenic headache typically starts in the neck or base of the skull, is one-sided, and is provoked by neck movement or sustained postures.2 Many people have more than one type and do not realize it, because they all get filed under "my headaches."
The reason this matters is that the fix depends on the type. A neck-driven headache may respond to manual therapy and exercise for the cervical spine. A migraine will not be fixed by neck treatment alone, though neck involvement may be part of the picture. And a headache driven by frequent pain-reliever use will not improve until the medication pattern changes, no matter how good the rest of the care is.
What a useful diary tracks
You do not need an app, although many exist. A notebook or the notes function on your phone works fine. Each day, record:
- Whether you had a headache, roughly when it started and how long it lasted.
- Where it was (one side or both, front, back of the head, behind the eye) and what it felt like (throbbing, pressing, sharp).
- Intensity on a simple 0 to 10 scale.
- Other symptoms: nausea, light or sound sensitivity, visual changes, neck stiffness, dizziness.
- What you took, including over-the-counter medication, and whether it helped.
- Context: sleep the night before, meals skipped, caffeine, alcohol, stress, screen hours, menstrual cycle if relevant, and anything unusual that day.
Record the headache-free days too. It sounds pointless, but the contrast is where the information lives. If every headache day follows a short night and every good day follows a normal one, that pattern only shows up when both are written down.
Aim for at least two weeks, ideally four. Headache diaries have been used in research for decades precisely because recall over a month is unreliable; people tend to remember the worst days and forget the mild ones.3
What people commonly discover
A few findings come up again and again when patients bring a diary to an appointment.
The medication count is higher than expected. Taking simple pain relievers on fifteen or more days a month, or migraine-specific medication on ten or more, is associated with medication-overuse headache, where the treatment itself starts maintaining the problem.4 Almost nobody realizes they are near that threshold until they count.
The neck is involved more than they thought. Headaches that cluster after long desk days, driving, or poor sleep positions, and that come with neck stiffness, point toward a cervical contribution. That is something a hands-on assessment can confirm, and it is a common finding in Winnipeg office workers through the long indoor months. Our article on cervicogenic headache goes deeper on this.
Triggers are usually cumulative, not single. People often look for the one food or the one event. More often the diary shows a stack: a poor sleep, a skipped lunch, a stressful afternoon, and then the headache. Any one alone would have been fine. This is helpful because it means you do not need to eliminate everything, just avoid stacking too many on the same day.
Some headaches are not one type. Seeing a clear migraine pattern on some days and a neck-driven pattern on others changes the plan completely, because each needs its own approach.
Using the diary to guide care
When you bring a diary to an assessment, it changes the conversation. Instead of reconstructing a vague history from memory, we can look at frequency, pattern, and triggers together and decide where the effort should go first. For some people that is neck-focused treatment and exercise. For others it is sleep and medication habits. For many, it is a combination. You can read about how we assess headaches and how the diary fits into that process.
A diary also tells you whether anything is working. If you start a plan and the headache days per month drop from twelve to five over eight weeks, that is a real result you can see. If nothing changes, that is useful too, because it means the plan should change.
One important note. A diary is for recurring headaches with a familiar pattern. A sudden, severe headache unlike any you have had, a headache with fever, confusion, weakness, or visual loss, or a new headache pattern after fifty or after a head injury needs medical assessment promptly, not a diary.5 When in doubt, get it checked.
For everything else, start writing things down. The pattern is usually there. You just have to look at it from far enough away to see it.
References
- Headache Classification Committee of the International Headache Society (IHS). The International Classification of Headache Disorders, 3rd edition. Cephalalgia. 2018;38(1):1-211.
- Sjaastad O, Fredriksen TA, Pfaffenrath V. Cervicogenic headache: diagnostic criteria. Headache. 1998;38(6):442-445.
- Russell MB, Rasmussen BK, Brennum J, Iversen HK, Jensen RA, Olesen J. Presentation of a new instrument: the diagnostic headache diary. Cephalalgia. 1992;12(6):369-374.
- Diener HC, Dodick D, Evers S, et al. Pathophysiology, prevention, and treatment of medication overuse headache. Lancet Neurol. 2019;18(9):891-902.
- Do TP, Remmers A, Schytz HW, et al. Red and orange flags for secondary headaches in clinical practice: SNNOOP10 list. Neurology. 2019;92(3):134-144.