Yes, and headache is among the most frequently reported symptoms following a head injury, including injuries that involved no loss of consciousness. A head injury can cause headaches both in the days afterward and, for some people, persistently beyond the expected recovery period.
The complication is that post-traumatic headache borrows its features from other headache types. Our note on whether migraines damage the brain covers a related question people raise alongside this one.
Medical Disclaimer
This article is general information and is not medical advice. A head injury needs assessment by a medical professional, not self-management. If you or someone else has sustained a head injury and has any of the danger signs described below, seek emergency care immediately rather than reading further.
Quick Answer
Headache commonly follows head injury and usually settles as recovery progresses. When it continues beyond three months it is classified as persistent. Post-traumatic headache often resembles migraine or tension-type headache rather than having its own distinct pattern, which is why it is described by its cause instead.
Key Takeaways
- Headache is the most commonly reported symptom after a head injury.
- Loss of consciousness is not required for an injury to produce it.
- The headache usually mimics migraine or tension-type headache.
- Persistent forms are recognized when it continues beyond three months.
- An injury can also worsen migraine that was already present.
- Frequent treatment creates a specific medication overuse risk here.
- Certain signs after a head injury require emergency care rather than monitoring.
| What you notice after a head injury | Category | What to do |
|---|---|---|
| Headache that is getting worse | Danger sign | Emergency care now |
| Repeated vomiting | Danger sign | Emergency care now |
| Drowsiness, or difficulty waking | Danger sign | Emergency care now |
| Slurred speech, weakness or numbness | Danger sign | Emergency care now |
| One pupil larger than the other | Danger sign | Emergency care now |
| A seizure, or unusual behavior | Danger sign | Emergency care now |
| Headache easing across days | Expected recovery | Follow medical advice given |
| Headache continuing for months | Persistent form | Clinical review, not self-treatment |
Yes, and It Is One of the Most Common Symptoms
The Centers for Disease Control and Prevention lists headache among the symptoms commonly reported after a concussion, alongside dizziness, nausea, sensitivity to light and noise, difficulty concentrating, and changes in sleep and mood.
An important detail is that an injury does not need to have caused unconsciousness to produce these effects. Plenty of injuries that people describe as minor knocks are followed by symptoms.
The International Headache Society’s classification recognizes headache attributed to traumatic injury to the head as a diagnostic category, with both an acute form and a persistent form.
Whiplash is worth noting separately. A neck injury with no direct impact to the head can also produce headache, and the classification treats that as its own entity.
Post-Traumatic Headache Has No Signature of Its Own
This is the part that makes the condition slippery. Post-traumatic headache is defined by what preceded it rather than by how it feels.
In practice it most often resembles migraine or tension-type headache, and sometimes features of both. Someone can develop throbbing one-sided pain with light sensitivity after a head injury and meet the description of migraine entirely.
So the diagnosis rests on the timing relative to the injury. That is why an accurate account of when the headaches began matters so much at an appointment.
Our guide to migraine against ordinary headache covers those two patterns, and our guide to how migraines are diagnosed covers why history carries the weight in headache diagnosis generally.
The National Institute of Neurological Disorders and Stroke describes the range of symptoms that can follow traumatic brain injury and the variability in how long they persist, which is consistent with a condition defined by cause rather than by presentation.
Danger Signs Come First
Before any discussion of managing a headache, the danger signs need stating, because they change what happens next entirely.
The CDC identifies signs after a head injury that call for emergency care: a headache that gets worse, weakness or numbness, decreased coordination, repeated vomiting, unusual drowsiness or difficulty waking, one pupil larger than the other, slurred speech, convulsions or seizures, and unusual behavior or increasing confusion.
Any of those means going in rather than waiting to see. The purpose of the list is that it is checkable by someone who is not a clinician.
That is also the reason a person with a head injury should not be left alone to monitor themselves. Several of those signs are easier for someone else to notice.
Nothing in this article replaces that assessment. A headache after a head injury is a reason to be seen, not a reason to read about headaches.
When an Injury Meets Existing Migraine
An injury can worsen migraine someone already had, increasing frequency or severity rather than creating something new.
It can also appear to start migraine. Someone with an undiagnosed tendency toward migraine may find attacks begin in earnest after a head injury, and untangling which happened is not always possible.
Either way the practical effect is similar. The headache load rises, and the treatment approach borrows from migraine management because the pattern resembles migraine.
Cognitive and mood symptoms frequently accompany this period as well. Our notes on migraine and memory and migraine and anxiety cover symptoms that overlap with what is reported after injury.
Why Medication Overuse Is a Specific Risk Here
This deserves its own section because the setup is almost designed to produce it.
Someone recovering from a head injury has frequent headaches, reaches for acute pain relief often, and does so over weeks. That is the pattern that leads to medication overuse headache.
The result is a second headache problem layered on the first, and it can be mistaken for the injury failing to resolve.
Our medication overuse headache guide covers how that develops and what it looks like, which is worth understanding early rather than after months of daily dosing.
The practical step is recording what you take and how often, from the beginning. Our guide to what to record in a headache diary covers the format, and that record answers the question a clinician will ask.
What Recovery Involves
- Get assessed, then follow the plan you are given. This is not a self-managed condition.
- Return to activity gradually. Both physical and cognitive load, stepped rather than resumed.
- Protect sleep deliberately. Disrupted sleep is both a symptom and a factor that worsens headache.
- Avoid a second injury during recovery. This is the specific reason return-to-play decisions are taken carefully.
- Track headaches and medication from day one. Frequency is the figure that changes management.
- Raise persistence rather than accepting it. Headache continuing beyond the expected window is a reason for review.
- Ask for referral if it is not resolving. Persistent post-traumatic headache is managed by specialists.
Our guides to preparing for an appointment and finding a specialist both apply here, since persistent post-traumatic headache is treated by the same clinicians who manage migraine.
Related Reading
Frequently Asked Questions
Can a head injury cause headaches?
Yes. Headache is among the most commonly reported symptoms following a head injury, and it can occur after injuries that involved no loss of consciousness. Most resolve as recovery progresses. When headache continues beyond three months it is classified as a persistent form and warrants specialist review.
Do I need to have been knocked out?
No. Loss of consciousness is not required for a head injury to produce headache or the other symptoms associated with concussion. Injuries people describe as minor knocks are frequently followed by symptoms, which is why assessment is based on what happened and what followed rather than on unconsciousness.
What does post-traumatic headache feel like?
It has no distinct signature of its own. It most commonly resembles migraine or tension-type headache, and sometimes carries features of both. Because of that, the diagnosis rests on the timing relative to the injury rather than on the character of the pain itself.
When is a headache after a head injury an emergency?
When it is getting worse, or when it comes with repeated vomiting, unusual drowsiness or difficulty waking, slurred speech, weakness or numbness, decreased coordination, unequal pupils, a seizure, or unusual behavior and increasing confusion. Any of those calls for emergency care immediately rather than monitoring at home.
Can an injury make my existing migraines worse?
Yes, and that is a recognized pattern. An injury can increase the frequency or severity of migraine someone already had, and it can also coincide with attacks beginning in someone with an undiagnosed tendency toward them. Distinguishing the two is not always possible.
Why is medication overuse a particular risk after an injury?
Because the circumstances encourage it. Frequent headaches during recovery lead to frequent acute pain relief over a period of weeks, which is precisely the pattern that produces medication overuse headache. The result can be mistaken for the original injury failing to improve.
Can whiplash cause headaches without hitting my head?
Yes. A neck injury with no direct impact to the head can produce headache, and headache attributed to whiplash is recognized as its own diagnostic entity. This is worth mentioning at an appointment, since the mechanism of injury shapes the assessment.
When should I see a professional?
After any head injury, and urgently if any danger sign is present. Also see a clinician if headaches continue beyond the period you were told to expect, if they are increasing, or if you are taking acute pain relief frequently. Persistent post-traumatic headache is managed rather than waited out.
Sources
- Centers for Disease Control and Prevention. Concussion signs, symptoms and danger signs.
- International Headache Society. International Classification of Headache Disorders, headache attributed to traumatic injury to the head.
- National Institute of Neurological Disorders and Stroke. Traumatic brain injury.
