If you have frequent headaches and often take medicine for relief, rebound headaches—also called medication-overuse headache (MOH)—are one possibility. Clinicians look at both how many days you have a headache and how many days you use each type of acute medicine. The pattern can flag MOH, but it does not by itself prove that medication caused your headaches.
How Clinicians Identify Rebound Headaches
Under the International Classification of Headache Disorders, MOH is considered when someone with a pre-existing headache disorder has headaches on 15 or more days a month and regularly overuses acute headache medicine for more than three months. Migraine is a common underlying condition, but MOH can occur with other headache disorders too.
The medicine thresholds differ by class. In general, use on the following number of days per month for more than three months meets the overuse threshold:
- 10 or more days: triptans, opioids, ergot medicines and combination painkillers (for example, products containing more than one pain-relieving ingredient or a painkiller with caffeine).
- 15 or more days: simple painkillers such as paracetamol (acetaminophen), aspirin or non-steroidal anti-inflammatory drugs (NSAIDs), including ibuprofen.
When you take medicines from different classes, a clinician may also consider whether use across classes reaches 10 days a month, even if no single class crosses its own threshold. These are classification cut-offs, not guarantees that headaches will worsen below them or proof that a medicine caused symptoms above them. The criteria count days of use, not the number of tablets or total dose.
That distinction matters: a person may take more medicine because headaches are becoming more frequent, while frequent use may also contribute to a worsening cycle. A headache diary helps clarify the sequence. Record headache days, medicine name and class, and the days you take each medicine. Bring the packages or a medication list to an appointment, since brand-name products can contain combinations.
Why The Medicine Type Matters
The lower threshold for triptans and combination medicines reflects differences between medication classes in how they are associated with headache progression. It does not mean that simple painkillers are risk-free; their threshold is higher, not unlimited. Frequent headache itself is also important, and a clinician will assess the underlying headache pattern rather than relying on medicine counts alone.
MOH symptoms can resemble the headache you already have. A changing pattern or more headache days may raise concern, but there is no single symptom that confirms it. The diagnosis depends on the history and pattern of use. If you are also managing chronic migraine, this guide to chronic migraines and headaches offers related context.
Reducing Overuse While Starting Prevention
Management usually addresses both sides of the pattern: reducing overused acute medicine and improving control of the underlying headache. A clinician may discuss withdrawal or a gradual reduction, and may start or adjust preventive treatment at the same time. Preventive treatment aims to reduce headache frequency and reliance on acute medicines; it does not guarantee that withdrawal will be easy or that headaches will stop.
Approaches vary. Some guidance emphasizes education, preventive treatment and withdrawal as parts of a coordinated plan; the best timing can depend on the medicine, your health and local practice. In some cases, clinicians may consider short-term support during withdrawal. Agree in advance on what to do for headaches during the change, how to track progress and when to follow up. Don’t replace one frequently used acute medicine with another without discussing the plan.
Don’t Stop Opioids Or Barbiturates Suddenly On Your Own
Even when reducing a medicine is part of treatment, stopping is not always a simple or safe do-it-yourself step. Abrupt withdrawal is used in some plans for certain non-opioid medicines, but opioids and barbiturates need particular caution because withdrawal can occur. Opioid withdrawal may involve headache, nausea, anxiety, restlessness and sleep disturbance. Your clinician can advise whether a gradual, supervised reduction or another approach is appropriate for the medicine you take.
If you use an opioid or barbiturate frequently, contact the prescriber before changing or stopping it. Seek clinical advice as well if headaches are becoming frequent or you regularly need acute medicine; a diary can help make that conversation specific. The right plan depends on your headache history and medication pattern, so this information cannot diagnose MOH or determine a personal withdrawal schedule.
