Most people do not think “brain injury” when a headache shows up after a crash. They think stress. They think they slept wrong. They think they are dehydrated. And sometimes they are right.
But here is the problem: after an accident, a headache can also be the first clue that the brain took a hit, even when there is no bleeding, no visible bruise, and no dramatic loss of consciousness. Concussions and other traumatic brain injuries often start quietly. The headache is the symptom that lingers, changes, or escalates.
If you are dealing with headaches after a car accident, a fall, or any sudden impact, this guide explains when you should take it seriously, what to do next, and how to protect your health and your claim.
Are headaches after an accident normal?
Yes. Headaches are common after trauma. The body can react to a crash or fall in several ways that cause head pain without a brain injury.
Common non brain causes include:
• Neck strain and whiplash
• Tight shoulder and scalp muscles
• Stress response and sleep disruption
• Jaw clenching
• Dehydration or missed meals after the incident
That said, the fact that headaches are common is exactly why people ignore them. They assume time will fix it. Sometimes it does. Sometimes it does not.
Primary vs secondary headaches: why the difference matters after a crash
The International Headache Society classifies headaches as either primary or secondary. Primary headaches are often managed with conservative treatment. Secondary headaches, however, are triggered by an underlying cause and may require faster medical evaluation because they can involve higher risk and more serious outcomes.
That distinction matters after a car accident. Post-traumatic headaches caused by acceleration/deceleration forces in a motor vehicle crash are considered secondary headaches and they often appear alongside whiplash-related symptoms. When headaches worsen as days pass, clinicians must consider uncommon but dangerous possibilities, such as a subdural hematoma, and escalate evaluation instead of assuming the pain is routine.
When Headaches After an Accident Signal a Brain Injury 2 When a headache is a red flag for concussion or traumatic brain injury
Headache is one of the most frequently reported concussion related symptoms. In a CDC published analysis of self reported symptoms, headache was the most commonly reported symptom overall at 55.1%, ahead of dizziness or balance issues.
Pay attention if any of these are true:
1) When the headache is new and starts soon after the trauma (the ICHD-3 rule)
In ICHD 3, a headache that starts after head or neck trauma and appears within 7 days is classified as a secondary, trauma related headache. In practice, a new headache in that window can be an early sign of concussion or brain injury, especially if it comes with dizziness, brain fog, memory issues, light sensitivity, nausea, or if it worsens instead of improving.
2) When the headache is paired with concussion pattern symptoms
Headache becomes much more suggestive of concussion (mild TBI) when it shows up with neurological symptoms like:
- dizziness or balance problems
- confusion, “fog,” slowed thinking
- memory gaps
- sensitivity to light or noise
- nausea or vomiting
- vision changes
- sleep disruption
These are widely listed concussion symptom patterns in major clinical references.
3) When the headache worsens over time or does not go away
A headache after injury is treated as a higher risk warning sign when it is getting worse or persistent rather than steadily improving. The CDC specifically lists “a headache that gets worse and does not go away” among danger signs requiring urgent evaluation. AANS lists the same pattern as a danger sign.
This aligns with your excerpt: post traumatic headaches after motor vehicle acceleration/deceleration injury are secondary headaches, and worsening symptoms should trigger consideration of serious differentials (example: subdural hematoma).
4) When the headache comes with “go now” neurological red flags
If headache is accompanied by any of these, it is not treated like a routine post accident symptom:
- repeated vomiting
- seizures
- slurred speech
- weakness, numbness, decreased coordination
- one pupil larger than the other
- increasing confusion, agitation, inability to recognize people/places
- extreme drowsiness or inability to wake up
CDC lists these as danger signs that should prompt emergency care.
What to do if you have headaches after a car accident
1. Get checked medically
If you have severe headache, repeated vomiting, confusion, weakness, speech changes, or vision changes, treat it as urgent. Even if symptoms feel “mild,” early evaluation creates a record and helps rule out serious complications.
2. Document the headache like a symptom, not a feeling
Write down:
- When it started
- How often it happens
- What worsens it, screens, driving, light, noise
- What accompanies it, dizziness, brain fog, nausea, fatigue
This helps doctors, and it also matters later if an insurance company challenges the injury.
3. Do not rush back to normal pace
Many people discover the pattern when they return to work and screen time, headaches spike, concentration drops, irritability rises, sleep gets worse. That pattern is important information, not something to push through.
Need a brain injury lawyer? Call Bojat Law Group
Headaches after an accident can be temporary, but they can also be the earliest signal of a traumatic brain injury. The data shows how common post traumatic headaches are after TBI, especially mild TBI, and that is exactly why they should not be minimized. If you are dealing with headaches after a crash or fall, brain injury lawyers at Bojat Law Group can help you understand your next steps and protect your claim. If headaches are disrupting your life after an accident, call (818) 877-4878 to learn how we can help you recover damages.
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