Hi, my name is David Gammill — injury lawyer.
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There are really two questions hiding in “how long after a car accident can you claim injury?” One is the legal question: what’s the deadline for filing a claim or lawsuit? The other is the practical question: how late can you start treating injuries that didn’t show up at the scene?
Both matter. Both have specific answers. And the gap between the legal deadline (years) and the practical window (days) is where a lot of valid injury claims go to die.
This guide covers both. We’ll walk through California’s deadlines for filing injury claims, explain why injuries that appear later are still legitimate (and how to prove it), and show how a car accident attorney handles delayed injury cases.
In California, you have two years from the date of the accident to file a personal injury lawsuit. But you should report the accident to your insurer within 24 to 72 hours, and you should see a doctor as soon as possible, ideally the same day.
Those two windows do different things. The two-year deadline preserves your legal right to sue. The same-day medical visit preserves your ability to prove your injuries actually came from the crash.
| Type of Claim | California Deadline | What Happens If You Miss It |
|---|---|---|
| Insurance claim notice | Usually 24 to 72 hours; check your policy | Insurer may deny coverage |
| Personal injury lawsuit | 2 years from accident date | Case is permanently barred |
| Property damage lawsuit | 3 years from accident date | Cannot recover for vehicle damage |
| Wrongful death lawsuit | 2 years from date of death | Family loses right to sue |
| Government vehicle (city, state) | 6 months to file claim | Lawsuit cannot proceed |
| Minor (under 18) | 2 years from 18th birthday | Tolling rule extends timeline |
This part trips up a lot of people. After a crash, adrenaline floods your system. It masks pain, numbs sensation, and convinces you that you’re “fine” when you actually aren’t. Whiplash, soft-tissue injuries, concussions, and internal bruising commonly produce no symptoms for 24 to 72 hours. Some injuries take weeks to manifest fully.
Common delayed-onset injuries include:
None of this means you don’t have a claim. But it does mean the longer you wait to document your symptoms, the harder the claim gets to prove.
Here’s the dilemma. You feel fine the day of the crash. You don’t see a doctor. Two weeks later, your neck is killing you. You finally go to urgent care.
Your case is now harder, even though everything that happened to you is real and connected to the crash. Why? Because the at-fault driver’s insurer will argue: if you were really hurt, you would have gone to the ER. The two-week gap, they’ll say, means whatever’s wrong with you came from something else, working out, sleeping wrong, anything but their insured’s bad driving.
This argument is medically nonsense. Adrenaline really does mask pain. Whiplash really does take days to manifest. Doctors and lawyers know this. But insurers use the treatment gap as a wedge anyway, and unrepresented claimants often lose value because of it.
If you didn’t seek treatment immediately and now realize you’re hurt, here’s what to do:
For personal injury lawsuits in California, you have exactly two years from the date of the accident to file. Miss it by a day and your case is over, regardless of how strong it would have been.
There are a few exceptions:
If the injured person was under 18 at the time of the accident, the clock doesn’t start until their 18th birthday. They have until age 20 to file. Parents can also file on behalf of a minor child during the two-year window from the accident date.
If an injury wasn’t reasonably discoverable until later (a brain injury that wasn’t diagnosed until months after the crash, for example), the clock may start from the date of discovery rather than the date of the accident. This is called the discovery rule, and it applies in narrow circumstances.
If your accident involved a government vehicle (a city bus, a county police car, a CalTrans truck), special rules apply. You generally must file an administrative claim within 6 months of the accident, before you can even file a lawsuit. Miss the 6-month claim deadline and your case is essentially over.
If a loved one died from injuries caused by the accident, the family has 2 years from the date of death (not the date of the accident) to file a wrongful death claim.
These exceptions are narrow and tricky. Don’t assume you qualify, talk to a lawyer to confirm. Our guide to California’s statute of limitations covers the rules in more detail.
This is different from the lawsuit deadline. Most auto insurance policies require you to report an accident “promptly” or within a specific window like 24 to 72 hours. Failing to report can give the insurer grounds to deny coverage, even if everything else about your claim is valid.
The bottom line: report the accident to your own insurer right away, even if you’re not sure whether you’re hurt yet. Reporting doesn’t commit you to filing a claim. It just keeps your coverage intact.
| 1 | They emphasize the gap
Argue that any delay between the accident and treatment proves the injury came from something else. |
| 2 | They request your full medical history
Hunt for any prior injury or condition they can blame your current pain on. |
| 3 | They monitor your social media
Look for photos or posts that suggest you weren’t really hurt during the gap period. |
| 4 | They offer a quick lowball settlement
Bet that you’ll take small money rather than fight the gap argument. |
| 5 | They challenge the medical causation
Argue that your doctor can’t prove the injury came from the crash specifically. |
| 6 | They draw out the negotiation
Hope you’ll get tired and accept less to make the case go away. |
| Symptoms Showed Up Days or Weeks Later? You Still Have a Case.
Delayed-onset injuries are common after car accidents and they’re absolutely valid grounds for a claim. The longer you wait to talk to an attorney, the harder it gets. Speak with Gammill Law’s personal injury attorneys for a free, no-obligation case review. |
If you signed a settlement release before realizing the full extent of your injuries, you generally cannot reopen the case. Settlement releases are designed to be final.
Narrow exceptions exist for fraud, mutual mistake about the nature of the injury, or settlements signed under duress, but these are hard to prove and require an attorney’s involvement. The realistic answer is: once it’s signed, it’s signed. This is exactly why the early settlement offers from insurers are usually a trap.
Even if you missed the first few days, start documenting now. Keep a daily pain journal. Save every receipt. Record every symptom. Take photos if there’s anything visible. Our guide to documenting your personal injury walks through what to track and how.
Once you start medical care, don’t skip appointments. Gaps in treatment after the initial visit are even more damaging than the initial delay, because they suggest you stopped feeling hurt. Even if you can’t afford treatment, talk to your attorney about doctors who work on liens (paid out of settlement).
Tell every doctor about the accident, even if you’re seeing them for something that seems unrelated. Connections that look obvious in hindsight (a car crash and later sleep problems, for example) are easy to miss in the medical record if no one mentions them.
If the at-fault driver’s insurer wants a recorded statement about your delayed symptoms, decline politely. Anything you say can be used to argue that you don’t really know when symptoms started, or that they came from something else.
Two years from the date of the accident for personal injury, three years for property damage. Government vehicle claims have a 6-month notice requirement. Wrongful death has a 2-year window from the date of death.
Delayed-onset injuries are common and valid. See a doctor immediately once symptoms appear, document the timeline carefully, and talk to a personal injury attorney about how to handle the gap argument.
Yes. Saying “I’m fine” at the scene is reflexive, and adrenaline often masks injuries. Your statement to police isn’t a binding waiver of injury claims. It is something insurers will use, though, so document the development of symptoms carefully.
Not for the lawsuit itself, but uninsured motorist claims under your own policy may have different deadlines and notice requirements. Check your policy and talk to an attorney.
Go today. Don’t wait. The longer you delay, the harder the claim gets. Then talk to a personal injury attorney before contacting the at-fault driver’s insurer.
If you already signed a settlement release, you generally cannot reopen the case. This is why accepting early settlement offers (especially before treatment is complete) is risky.
California gives you two years to file an injury lawsuit, but the practical window for protecting your claim is much shorter. See a doctor as soon as possible after the accident, even if you feel fine. Report to your insurer within 72 hours. Document everything. Talk to a lawyer before talking to the at-fault driver’s insurer.
If symptoms didn’t appear for days or weeks, you still have a valid claim. It’s just harder to prove, which makes representation that much more important. The good news is that personal injury lawyers handle delayed-injury cases all the time. The free consultation is the fastest way to know where you stand.
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Hi, my name is David Gammill — injury lawyer.