Symptoms after a car accident
Start with what you’re actually feeling.
Below are the symptoms we see most often after a collision, what they usually mean, and when they’re worth having examined. None of this replaces an evaluation — but it should help you work out how concerned to be.
If you already know something is wrong, you don’t have to read first. A phone conversation with Dr. Jimenez within 24 hours, if you want one.
First — these need emergency care, not an appointment
Call 911 or go to the nearest emergency room if you have:
- New or worsening weakness in an arm or leg
- Numbness that is spreading
- Loss of bladder or bowel control
- New difficulty walking or keeping your balance
- Severe or worsening headache, confusion, or repeated vomiting
- Chest pain, difficulty breathing, or severe abdominal pain
What you’re feeling, and what it usually means
Neck pain and stiffness
The most common complaint after a collision, and the one most likely to arrive late. The rapid back-and-forth motion of an impact strains the ligaments, muscles and discs of the neck. It typically peaks 24 to 72 hours afterwards. Turning to check a blind spot is often the first movement that becomes difficult, and mornings are usually worse than evenings. Most cases settle with treatment; the ones that need attention are those with pain radiating into the shoulder or arm, or that aren’t improving after a week or so.
Headaches that started after the accident
Often coming from the neck rather than the head — particularly headaches felt at the base of the skull that worsen with neck movement. They can also follow a concussion. More about headaches after a car accident A headache that arrives with confusion, repeated vomiting or worsening drowsiness is in the emergency list at the top of this page and is not one to wait on. Otherwise, headaches that began after a crash and haven’t settled are worth evaluating.
Low back pain
The lumbar spine absorbs a great deal in rear-end and side-impact collisions. Most low back pain after an accident is muscular or ligamentous and improves — typically most noticeable getting out of a car or up from a chair. Pain that radiates below the knee, or that comes with numbness or weakness in the leg, suggests a nerve is involved and should be looked at sooner. More about back and neck pain after a car accident
Numbness or tingling down an arm
Usually means a nerve in the neck is being irritated or compressed — often by a disc. Where the numbness is felt tells us which nerve. This is one of the symptoms we most want to see early, because nerve compression treated promptly generally does better than nerve compression treated late.
Pain shooting down a leg
The lower-body equivalent — commonly sciatica, from a lumbar disc pressing on a nerve root. Same principle: worth evaluating rather than waiting out, particularly if there’s weakness with it.
Pain in the hip or buttock
Frequently referred from the low back or the sacroiliac joint rather than originating in the hip itself. This is a good example of why examination matters — the location of the pain and the location of the problem are often different.
Pain that was mild at first and is getting worse
Worth listing on its own, because it is a pattern rather than a place. Most accident injuries are at their worst early and then ease. Pain moving the other way — mild on day one, harder on day five — is the one that most often turns out to be worth examining, whatever part of the spine it is in.
Trouble sleeping, or waking up markedly stiff
Easy to dismiss as unrelated, and frequently the first thing people mention once asked. Pain that reliably wakes you, or stiffness that takes an hour to loosen each morning, is telling you the injury is still active rather than settling.
Chest pain, or difficulty breathing
This one is not a follow-up symptom. Chest pain, difficulty breathing or severe abdominal pain after a collision needs emergency assessment — call 911 or go to the nearest emergency room. It is on this page only so that nobody searching for it reads past it.
Weakness, clumsiness, or trouble with balance
Difficulty gripping, dropping things, buttons becoming awkward, or feeling unsteady on your feet. These can indicate spinal cord involvement in the neck. Uncommon, but the most important thing on this page to have assessed promptly — and if it’s come on suddenly or is worsening, treat it as an emergency.
Recognising more than one of these is common, and it is the point at which reading stops being useful.
Most of this has one name: whiplash
If several of the entries above sound familiar, the word you are likely to meet is whiplash. It is worth being precise about what it means, because it gets used as though it were a diagnosis when it is really a description of a mechanism.
The rapid back-and-forth motion of a collision stresses the ligaments, muscles and discs of the neck. What that leaves behind varies enormously — from a stiff neck for a fortnight, to a disc pressed against a nerve root, which is a different problem needing different treatment.
How you would know if you have whiplash
There is no single test you can do at home. What points to it is the combination: neck pain and stiffness that arrived in the first day or two rather than immediately, headaches felt at the base of the skull, difficulty turning your head, and sometimes pain or tingling into a shoulder or arm.
How long whiplash lasts
The honest answer is that it depends on what was actually injured, which is the thing an examination establishes. Symptoms typically peak 24 to 72 hours after the collision. Most cases settle with treatment. The ones that don’t tend to be the ones with nerve symptoms, and those are better identified early than late — which is the argument for having it looked at rather than waiting to see.
Why you may feel worse now than you did at the scene
Two reasons: adrenaline masks pain effectively in the hours after a crash and then wears off, and inflammation from soft tissue injury builds over the following one to three days.
So “I felt fine at the time” is normal and isn’t reassuring on its own — it’s the reason we’d rather see people at day three than day thirty.
Usually there at the scene
- Neck pain or stiffness
- Back pain, especially low back pain
- A headache that started after the crash
- Feeling shaken but basically fine — the most common report of all, and the reason people go home and wait
Usually over the next few days
- Neck pain or stiffness that isn’t easing
- Pain that radiates into an arm, hand, leg, or foot
- Numbness or tingling anywhere, even if it comes and goes
- Weakness — a grip that feels unreliable, a leg that feels heavy
- Headaches at the base of the skull
- Pain that was mild at first and is getting worse
- Trouble sleeping, or waking up markedly stiff
More on why a clean scan and real pain aren’t a contradiction
What to do with all this
If something above sounds like you, the most efficient next step is a conversation rather than a search.
Tell us what happened and what you’re feeling, and within 24 hours you can talk it through by phone with Dr. Jimenez . He’ll tell you whether it warrants an examination, whether imaging would help, and what to watch for meanwhile.
No referral needed, and no attorney needed.
What happens after you send a request What kind of doctor to see after a car accident More about car accident injuries If the ER already cleared you