Key takeaways
- A headache that begins one to three days after a crash is a common pattern, not a coincidence, and it often travels with a neck injury that has not been examined.
- People reach for the word migraine because it is the word they know. The right word comes from an exam, not a search box.
- If your head struck anything, or you felt dazed even briefly, say so when you call. That changes what the examiner looks at.
- Sudden, severe, or worsening head symptoms are an emergency room tonight. The grinding kind that follows a crash is what this desk is for.
Most people who search for this at this hour are describing the same week. The pattern is common enough to be written down in order, and we think that is worth doing, because a pattern you recognize is easier to act on than a pain you are still trying to name.
The scene: adrenaline does the talking
At the scene you feel shaken and mostly fine. You trade insurance information, you decline the ambulance, you drive home or get driven. Your body is running on the chemistry it uses for emergencies, and that chemistry is very good at hiding the things it cannot fix. Nothing about feeling okay at the scene tells you what the next three days will bring.
This is also the moment the neck did its work. In a rear-end hit the torso is pushed forward by the seat while the head lags for a fraction of a second, then snaps to catch up. The National Institute of Neurological Disorders and Stroke describes whiplash as exactly that kind of sudden back-and-forth motion of the neck, with symptoms that can take hours or days to appear. You do not feel the strain happen. You feel it on Tuesday.
The first night: a stiff neck you blame on the pillow
Many people sleep badly the first night and wake with a neck that turns reluctantly to one side. It is easy to blame the pillow, the stress, the way you slept. Keep the date anyway. The first morning after is the first line in the log we ask you to keep, and it is the line that turns out to matter most.
Day two to three: the headache arrives
Then the headache. In the pattern we hear about most, it starts at the base of the skull and reaches forward, sometimes over one eye, sometimes across the forehead like a band. It may come with light sensitivity, a foggy feeling, nausea, or a sense that the screen is too bright even with the brightness turned all the way down. The neck is usually stiff on the same side. Turning to check a blind spot makes it worse.
People say migraine because migraine is the word they have for a headache that makes them want a dark room. It might be one. It might also be a headache that is being generated by the injured upper neck and referred into the skull, which feels very similar from the inside and is examined very differently. We wrote a separate reading on the neck connection because the distinction is the whole point of this desk.
The first week: the bargaining
By the end of the first week most readers have tried what they have in the house. Over-the-counter painkillers, a dark room, a heating pad, more water, less screen. Some of it helps for an afternoon. The headache comes back because the thing producing it has not been looked at. This is the week people tell themselves it will pass, and it is the week we most want to interrupt.
Here is the interruption, said plainly: a headache that began after a crash is a time-sensitive reason to be examined, not a wellness project. The exam documents the injury while the connection to the crash is fresh and visible. Waiting does not make the headache less real; it only makes the story harder to tell.
Weeks two and three: the pattern settles in
If nothing has been examined, the second and third weeks tend to settle into a rhythm. Some mornings are fine. Driving, desk work, and looking down at a phone bring the headache up by mid-afternoon. Sleep gets lighter. People start rearranging their days around light and neck position without quite admitting that is what they are doing.
It is still not too late. A later exam is a real exam. But an examiner working in week three has to reconstruct weeks one and two from your memory, and memory blurs bad days together. An exam in the first week works from a fresher picture, and the dated findings from that visit become the baseline every later visit is compared against.
When the head itself was hit
If your head struck the window, the wheel, the headrest, or anything else, or if you felt dazed, slowed, or foggy even for a moment, that belongs in the phone call. A concussion does not require losing consciousness, and the headache that follows one is on the Centers for Disease Control and Prevention's own list of concussion signs and symptoms. We wrote a full reading on being dazed without being knocked out.
Missouri Injury Clinic publishes concussion rehab after acute injury as one of its lanes, with tools it names on its own site: neurofeedback, oculomotor rehabilitation, sensory motor integration, exercise with oxygen, cognitive rehabilitation software, vagus nerve stimulation, and Alpha Stim. We repeat the list because the clinic publishes it. What any of it would mean for you is a question for the exam.
This week, not someday
Headaches teach people to wait, because waiting is often all anyone has offered them. A post-crash headache is different. There is a concrete step and it is time sensitive. Call the nearest room, say it was a car crash, give the date, and describe the headache honestly. If light hurts, say that on the phone too, and ask what they can do.
Educational reading, not medical advice. This desk cannot examine anyone; it exists to get you in front of someone who can.