A concussion is a mild traumatic brain injury, and most people recover from one within two to four weeks. Post-concussion syndrome is what happens when the symptoms refuse to leave: headaches, dizziness, brain fog, and mood changes that stretch on for months, sometimes a year or longer. If those symptoms started with a crash, a fall, a workplace accident, or a hit on a playing field, you may have a claim for the medical bills, lost income, and daily losses that come with it.
It is also one of the injuries insurance companies fight hardest, because it rarely shows up on a scan. What the condition is, how Illinois law treats it, and what evidence actually moves a claim all matter from the first week after the injury.
What Post-Concussion Syndrome Is
Concussions are caused by a blow or a sudden violent motion of the head or body that makes the brain move rapidly inside the skull. Illinois lawmakers describe the mechanism in exactly those terms in the state’s youth sports concussion statute, which also notes that the vast majority of concussions happen without any loss of consciousness (105 ILCS 5/22-80). You do not have to be knocked out to have a brain injury.
Post-concussion syndrome, sometimes called persistent post-concussive symptoms or PPCS, is the diagnosis when those symptoms outlast the expected recovery window. Clinicians commonly apply the label when symptoms are still present three months after the injury, though some use a shorter threshold. Published estimates of how often it happens vary a great deal, from roughly 10% of concussion patients on the low end to as high as 30% in some hospital reviews, partly because different organizations use different diagnostic criteria and many people with concussions never see a doctor at all.
It is not the same thing as chronic traumatic encephalopathy. CTE is a progressive degenerative disease tied to repeated head impacts, with symptoms that often surface years later. Post-concussion syndrome traces back to one identifiable injury, and most people do eventually recover.
Symptoms of Post-Concussion Syndrome
The symptoms are usually the same ones a concussion produces. They simply last far longer, and some of them do not appear until days or weeks after the injury. They tend to fall into four groups.
Physical
- Headaches of varying location and severity, the most common symptom of all
- Dizziness, vertigo, balance problems
- Neck pain
- Fatigue that rest does not fix
- Nausea
- Ringing in the ears
Sensory
- Sensitivity to light or noise
- Blurred or double vision
- Trouble reading or tracking moving objects
Cognitive
- Brain fog, slowed thinking
- Memory lapses
- Trouble concentrating at work or school
Emotional and behavioral
- Anxiety, irritability, short temper
- Depression or mood swings
- Personality changes family members notice before you do
- Insomnia or sleeping far more than usual
Get medical help right away if you lost consciousness for any length of time, if you have a seizure, or if symptoms worsen instead of easing. If a head injury brings thoughts of self-harm, the 988 Suicide and Crisis Lifeline is available around the clock.
Who Is Most Likely to Develop It
Doctors cannot reliably predict who will end up with lingering symptoms, but research points to several risk factors that raise the odds:
- Prior concussions or head injuries, with risk climbing after each one
- A concussion with complications such as a skull fracture or bleeding inside the skull
- A history of migraines, anxiety, depression, ADHD, or a learning disability
- More severe symptoms, or a larger number of them, in the first days after the injury
- Delayed medical care after the initial injury
Second-Impact Syndrome and Why Timing Matters
The most dangerous window is the one right after a concussion, before the brain has healed. A second blow during that period can trigger second-impact syndrome, which can cause catastrophic swelling, coma, and in severe cases death. Illinois lawmakers put the same warning into statute, finding that continuing to play with a concussion leaves a young athlete especially vulnerable to greater injury and even death (105 ILCS 5/22-80).
That risk is also why premature return-to-play decisions are often the negligence at the center of a sports concussion claim. The injury that ends up being litigated is frequently not the first hit. It is the one that came after somebody should have pulled the athlete off the field.
Youth Athletes and Illinois Concussion Law
Illinois has a detailed statute governing concussions in school sports, and it creates obligations that can matter enormously in an injury claim. Under the Youth Sports Concussion Safety Act provisions codified at 105 ILCS 5/22-80, for interscholastic athletic activities sponsored or sanctioned by a school, the IHSA, or the IESA:
- A student must be removed from practice or competition immediately if a coach, physician, game official, athletic trainer, parent, the student, or another designated person believes a concussion may have occurred
- Each school must appoint or approve a concussion oversight team that establishes both a return-to-play and a return-to-learn protocol based on peer-reviewed evidence consistent with CDC guidelines
- A removed student cannot practice or compete again until evaluated by a treating physician, athletic trainer, advanced practice registered nurse, or physician assistant, and cannot return without a written statement that it is safe to return to play and return to learn
- A coach may not authorize a student’s return to play or return to learn
- Students and parents must sign a form each school year acknowledging they received written concussion information approved by the IHSA
- Coaches, game officials, and non-licensed members of a concussion oversight team must complete concussion training at least once every two years
The statute’s own findings cite CDC estimates of as many as 3.9 million sports-related and recreation-related concussions in the United States each year, and note that the risk of catastrophic injury or death is significant when a concussion is not properly evaluated and managed (105 ILCS 5/22-80).
Sports outside the school system are covered separately. The Youth Sports Concussion Safety Act at 410 ILCS 145 reaches youth leagues run by park districts and private organizations, but its educational-materials provision is written as encouragement rather than a hard mandate, so a park-league case usually turns on ordinary negligence instead of a statutory violation. Whether a documented protocol failure supports liability in any particular case is fact-specific and needs an attorney’s review.
Claims involving a school carry an additional wrinkle. Under the Local Governmental and Governmental Employees Tort Immunity Act, a public entity or employee supervising an activity is generally liable only for willful and wanton conduct (745 ILCS 10/3-108), and the filing window against a local public entity is one year rather than two (745 ILCS 10/8-101). A second hurdle reaches school employees at public and non-public schools alike. Teachers and other licensed educational employees stand in the relation of parents and guardians to students in all activities connected with the school program, including athletics (105 ILCS 5/24-24), and Illinois courts have long treated that status as requiring willful and wanton conduct rather than ordinary negligence in supervision cases. Those rules change the strategy in a school concussion case from day one.
Concussions Outside of Sports
Sports coverage dominates the headlines, but most concussions and PCS cases at 844-SEE-MIKE come from everyday accidents:
- Car, truck, and motorcycle crashes, including low-speed collisions where the head never strikes anything
- Slip-and-falls and trip-and-falls on poorly maintained property
- Bicycle and pedestrian collisions
- Falls, struck-by, and machinery injuries on the job
- Assault and battery
Because a concussion can happen from whiplash alone, PCS often rides along with a claim that looks minor on paper. A fender-bender with modest vehicle damage can still leave someone unable to read a spreadsheet for six months. Our Illinois brain injury attorneys handle these alongside Illinois car accident claims, Chicago sports injury claims, and injury claims involving children.
Proving a Post-Concussion Syndrome Claim
Post-concussion syndrome is hard to prove, and insurance companies know it. No single test confirms the diagnosis. Unlike a fracture, PCS depends heavily on clinical judgment, symptom reporting, and expert opinion, which gives an adjuster room to argue you are exaggerating or that something else explains how you feel. That does not mean the condition cannot be established convincingly to an insurer or a jury. It means the record has to be built deliberately.
A successful claim generally has to show the defendant was at fault for the head trauma and that a medical professional connects the ongoing symptoms to it. Beyond the liability facts, a handful of practical questions usually drive value:
- Did you keep functioning normally after the accident, or did you miss work
- Were you unable to drive, severely fatigued, or unable to handle ordinary daily tasks
- Which medical expenses were not covered by insurance
- How much income was lost, and how much may be lost going forward
- What did family, coworkers, teachers, or coaches observe changing about you
Records that carry weight include emergency and urgent-care notes from the day of the injury, neurology and neuropsychology evaluations, symptom-scale scores tracked over time, physical, vestibular, or vision therapy notes, school accommodation paperwork for a student, and a plain daily journal of symptoms. Gaps in treatment are the single most common thing used against a PCS claim, so consistent follow-up care protects your health and your case at the same time.
What a Claim Can Cover
An Illinois personal injury claim involving post-concussion syndrome may seek compensation for past and future medical care, lost wages, reduced earning capacity if the symptoms change what you can do for a living, and non-economic losses such as pain, cognitive difficulty, and the loss of a normal life. Every case is different, and no one can responsibly promise a number. Any past results discussed on this site are illustrative and do not guarantee a future outcome.
If the head injury happened at work, the path runs through the Illinois Workers’ Compensation Act instead of a negligence suit. Notify the employer as soon as practicable and no later than 45 days after the accident, and file the application with the Illinois Workers’ Compensation Commission within three years of the accident or two years after the last compensation payment, whichever is later (820 ILCS 305/6). Our Illinois workers’ compensation attorneys can sort out which route fits.
Illinois Deadlines and Fault Rules
In most Illinois personal injury cases you have two years from the date of the injury to file suit (735 ILCS 5/13-202). For a child, the clock generally does not start until they turn 18, so a minor injured at 14 typically has until age 20 (735 ILCS 5/13-211). Claims against a public school district, park district, or other local public entity are the exception, with a one-year window (745 ILCS 10/8-101).
Illinois also uses modified comparative fault. If you are found more than 50% responsible for the injury you recover nothing, and at 50% or less your damages are reduced by your share of the fault (735 ILCS 5/2-1116). Expect an insurer to push that argument hard in a fall case or a return-to-play dispute.
Frequently Asked Questions
How long does post-concussion syndrome last?
Most people with post-concussion syndrome recover, but the timeline varies widely. Some improve within weeks or a few months of the diagnosis, while others have symptoms for a year or longer. A small minority are left with permanent effects. Clinicians typically use the PCS label once symptoms have persisted past about three months.
Can you sue for post-concussion syndrome in Illinois?
Yes, if someone else’s negligence caused the head trauma. The claim is a standard Illinois personal injury claim, usually filed against the at-fault party’s insurance company, or against the party directly if there is no coverage. A work-related head injury goes through workers’ compensation instead.
How do you prove post-concussion syndrome in an injury claim?
Through liability evidence showing the other party caused the impact, plus medical evidence connecting your continuing symptoms to it. That normally means testimony or written opinion from at least one treating provider, along with consistent treatment records, symptom tracking over time, and proof of how the symptoms changed your work and daily life.
Is post-concussion syndrome a permanent disability?
Usually not. Most cases resolve, though recovery can take many months. A small number of people are left with lasting impairment, and in those situations long-term disability benefits or a claim for reduced earning capacity may come into play. Only your treating providers can assess whether your symptoms are likely to be permanent.
What happens if a school lets my child play with a concussion?
Illinois requires immediate removal from an interscholastic practice or game when a concussion is suspected, and bars a return until a qualified provider has evaluated the student and put a clearance in writing. A coach cannot make that call (105 ILCS 5/22-80). Documented departures from those requirements can be important evidence, though a supervision claim also has to clear a willful and wanton standard, under the Tort Immunity Act for a public district (745 ILCS 10/3-108) and under the in loco parentis statute for school employees generally (105 ILCS 5/24-24).
How long do I have to file a concussion claim in Illinois?
Generally two years from the injury (735 ILCS 5/13-202), extended for a child until two years after they turn 18 (735 ILCS 5/13-211). If the claim is against a public school district or another local public entity, the deadline drops to one year (745 ILCS 10/8-101). Work injuries follow the workers’ compensation timelines instead.
Talk Through Your Options
Lingering concussion symptoms are exhausting to live with and easy for other people to dismiss, which is a frustrating combination when an insurance company is the one deciding what your injury is worth. A conversation costs nothing, and you pay nothing unless we recover money for you. Contact 844-SEE-MIKE anytime for a free, no-pressure consultation about a concussion or post-concussion syndrome claim in Illinois.
This information is general and educational, not legal or medical advice. For symptoms after a head injury, see a qualified medical provider.
