Headaches After a Car Accident? Your Neck May Be the Problem

The crash was a week ago. Your car's in the shop, the neck stiffness is fading — but now you've got headaches. Every afternoon. Starting at the base of your skull and wrapping up toward your eyes.

That's not a coincidence. It's one of the most common things I see after a car accident in St. Louis.

Why whiplash causes headaches

In a rear-end or side impact, your head whips forward and back faster than your neck muscles can react. The upper neck takes the brunt of it — the joints, ligaments and muscles right where your skull meets your spine.

Those upper neck structures share nerve pathways with your head. When they're injured or irritated, your brain reads the signal as head pain. This is called a cervicogenic headache — a headache that's actually coming from the neck.

What a whiplash headache usually feels like

• Starts at the base of the skull or back of the head
• Often one-sided, sometimes spreading to the temple, forehead or behind the eye
• Gets worse with neck movement, long drives, screen time or holding your head in one position
• Comes with neck stiffness or reduced range of motion
• May show up days after the crash, not right away

It can feel a lot like a tension headache or even a migraine. The tell is usually the neck: if turning your head or pressing on the upper neck brings the headache on, the neck is part of the story.

Red flags: go to the ER now

Headaches after a crash can also mean a concussion or something more serious. Get emergency care right away for:

• The worst headache of your life, or a sudden, explosive headache
• Confusion, unusual drowsiness or trouble waking up
• Repeated vomiting
• Vision changes, slurred speech, or weakness or numbness on one side
• Loss of consciousness at the time of the crash
• A headache that keeps getting worse instead of better
• Any headache after a crash if you take blood thinners

If you're not sure, get checked medically first. We'll be here after.

How we test for it

We don't guess, we test. A post-accident headache evaluation at Gateway includes:

• A detailed crash history — direction of impact, headrest position, where you were looking
• Neck range-of-motion and orthopedic testing, including the upper neck joints that commonly drive these headaches
• Neurological screening — reflexes, strength, sensation, and concussion red flags
• Motion Study X-Rays to see how your neck moves when it bends — ligament injuries that hide on a standard X-ray can show up here
• Clear documentation of every finding

If anything points to a concussion or needs imaging, a neurologist or your doctor, we'll refer you.

How we treat it

When the neck is driving the headache, we treat the neck:

• Gentle, specific adjustments to restore motion in the upper neck
• Soft-tissue work for the muscles at the base of the skull
• Stabilizing exercises so the injured area can handle daily life again
• Posture and workstation changes so you're not re-triggering it eight hours a day

We track headache frequency and intensity as we go, so you (and anyone else who needs to see it) have a clear record of how you're progressing.

Don't wait it out

Whiplash headaches can linger for months when the neck heals stiff and weak. The earlier you get the neck evaluated, the better your odds of a clean recovery.

If you felt fine right after the crash and the headaches showed up later, that's exactly the pattern to take seriously.

(We're chiropractors, not lawyers. For questions about your claim, deadlines or settlements, talk to a personal injury attorney.)

If headaches started after a car accident in St. Louis, let's take a look at your neck. You can also see how we handle auto accident injuries from start to finish.