Guides
Medication overuse headache: the trap of treating too often
It's the cruelest loop in headache medicine: the medication that rescues you from attacks can, taken often enough, become the reason the attacks keep coming. Nobody walks into this trap on purpose — and almost nobody notices without counting.
A trap made of reasonable decisions
Every single step into medication overuse headache makes sense at the time. You have an attack; you treat it — correctly, since early treatment works best. Attacks get a little more frequent, so you treat a little more often. Somewhere along the way, the brain's pain systems appear to adapt to the regular presence of the medication, and headaches begin to arrive more easily — including a dull background headache that greets you in the morning and eases when you take something. Each pill still "works," which is exactly what hides the pattern. From the inside it looks like your migraine is simply getting worse. From the outside, on paper, it looks like what it is: rising medication days pulling rising headache days along behind them.
The thresholds — and how to hold them
The International Classification of Headache Disorders (ICHD-3) describes medication overuse headache in people with a pre-existing headache disorder who have headache on 15 or more days a month alongside regular overuse of acute medication for more than three months. "Overuse" is defined in days per month, and the line depends on the medication class: roughly 15 or more days a month for simple analgesics like paracetamol, ibuprofen or aspirin, and 10 or more days a month for triptans, opioids, ergotamines, or combination painkillers.
Hold those numbers loosely. They are diagnostic criteria, not laws of nature — research on the mechanism is still evolving, susceptibility clearly varies between people, and being under a threshold is not a guarantee any more than crossing it is a sentence. What the thresholds are genuinely good for is a tripwire: a signal that your pattern is worth a proper conversation with a clinician, ideally before the three-month clock has quietly run.
Tell you to stop, start, ration or switch any medication. Some drugs are dangerous to stop abruptly, withdrawal from the cycle usually needs a plan, and clinicians have well-established strategies for it. If your counts look high, the move is a doctor's appointment with your numbers in hand — not a self-imposed cold turkey.
Why counting days changes everything
Notice the unit in every criterion above: days per month, not doses. That's convenient, because days are also the thing an honest diary counts effortlessly and memory counts terribly. Ask someone how often they took a painkiller last month and the answer is a feeling — "not that often, when I really needed it." Studies of self-reported medication use suggest such feelings run low, and the shortfall is largest precisely in people heading toward the thresholds, because frequent use fades into routine. The whole diagnosis, meanwhile, hinges on a number nobody can feel: eight medication days a month is a different clinical picture from twelve, and the gap between them is invisible without a tally.
The counting itself asks almost nothing of you — one honest bit per day. When you log an attack in Dim, noting what you took is part of the three-tap-then-details flow, and the app keeps the running count for you: its doctor report breaks out acute-medication days per month alongside headache days, and flags the months where the count runs into the ranges above, so the pattern surfaces while it's still a conversation rather than a diagnosis. Bring that page to an appointment and you've handed your clinician the exact table the criteria are checked against.
The way the story usually ends
There's a genuinely hopeful side to this condition: it's considered one of the more treatable causes of chronic daily headache. For many people, a clinician-supervised break from the overused medication — often alongside starting a preventive — leads to headaches settling back toward their old, more manageable baseline within weeks to a couple of months. The frequent-headache person who was "just unlucky" turns out to have been carrying a removable amplifier. That's the payoff for the unglamorous work of counting days: catching an amplifier early, or proving to yourself and your doctor that it isn't there. Either answer beats not knowing — and if your headache days are creeping up for any reason, our guide to episodic versus chronic migraine explains what the monthly counts mean.
Quick answers
Which medications can cause medication overuse headache?
The criteria cover the common acute options — simple analgesics at 15+ days a month, and triptans, opioids, ergots or combination painkillers at 10+ days a month. Preventive medication taken daily by prescription is a different category entirely.
Does one heavy month mean I have it?
No. The criteria describe a pattern sustained for more than three months. One rough month is a data point worth watching, not a diagnosis — but a good reason to keep counting.
How does Dim help with this?
Every attack log records what you took, and Dim's doctor report totals your acute-medication days per month automatically, flagging when the count runs high — so you and your doctor see the trend early.
Know your number
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