Persistent Symptoms After a Concussion: When Should You Seek Further Assessment?

Most people expect a concussion to cause symptoms for a few days and then gradually disappear. In many cases, that is what happens.

But recovery from a concussion is not identical for everyone.

Headaches, dizziness, fatigue, difficulty concentrating, memory problems, sleep disturbances, sensitivity to light or noise, and changes in mood can sometimes continue for weeks—or longer—after the original injury.

When these symptoms persist, it can be difficult to know what to do next.

Is the brain simply taking longer to recover? Could another problem be contributing to the symptoms? Is additional testing necessary? And when should you consider a more comprehensive post-concussion assessment?

For people whose symptoms are not resolving as expected, a more detailed evaluation can help identify which areas are still affected and which factors may be contributing to the difficulties.

How Long Do Concussion Symptoms Normally Last?

A concussion is a form of mild traumatic brain injury (mTBI) that can occur after a blow or jolt to the head—or another force that causes the brain to move rapidly within the skull.

Symptoms vary considerably from one person to another.

According to the U.S. Centers for Disease Control and Prevention (CDC), most people with a mild traumatic brain injury or concussion begin feeling better within a couple of weeks. The Ontario Living Concussion Guidelines similarly note that most patients recover from concussion-related symptoms within the first few weeks.

Some people, however, experience symptoms for considerably longer.

The Ontario guidelines estimate that approximately 15–20% of individuals experience symptoms beyond one month, although estimates vary depending on the population and how persistent symptoms are defined.

These are commonly referred to as persistent or prolonged post-concussion symptoms.

Recovery is therefore better understood as an individual process rather than a fixed timetable.

What Are Persistent Post-Concussion Symptoms?

Persistent post-concussion symptoms can involve several different areas of functioning.

Physical symptoms

These may include:

• Headaches
• Dizziness
• Balance difficulties
• Fatigue
• Nausea
• Sensitivity to light
• Sensitivity to noise
• Vision problems
• Neck discomfort

Cognitive symptoms

Some people describe feeling mentally slower or experiencing “brain fog.”

Other difficulties may include:

• Poor concentration
• Reduced attention
• Forgetfulness
• Memory difficulties
• Difficulty multitasking
• Slower processing of information
• Difficulty organizing or planning

Sleep problems

A concussion can also be associated with changes in sleep, including:

• Difficulty falling asleep
• Waking frequently
• Sleeping more than usual
• Sleeping less than usual
• Feeling tired despite adequate time in bed

Emotional symptoms

Changes in emotional functioning can include:

• Irritability
• Anxiety
• Sadness
• Increased emotional sensitivity
• Frustration
• Changes in stress tolerance

The CDC groups common concussion symptoms into physical, cognitive, emotional and sleep-related categories, which illustrates why concussion recovery can affect much more than headaches alone.

Why Can Symptoms Continue After a Concussion?

This is one of the most important questions—and there is not always one simple explanation.

Persistent symptoms following concussion are often multifactorial.

In other words, several different factors may contribute to how someone feels.

For example, persistent headaches may involve post-traumatic headache, migraine-like symptoms or problems involving the neck.

Dizziness could involve the vestibular system, vision, balance or other factors.

Concentration difficulties might be influenced by cognitive changes, but they can also become worse when someone is experiencing poor sleep, pain, fatigue, anxiety or depression.

The Ontario Living Concussion Guidelines emphasize that prolonged symptoms can overlap with other conditions, including chronic pain, depression, anxiety disorders and sleep disorders.

This is why simply asking:

may not always be the most useful question.

A more helpful question can be:

That distinction is one of the main reasons a comprehensive assessment can be valuable.

When Should You Consider Further Assessment?

There is no single date on the calendar when every patient suddenly needs additional testing.

However, further medical assessment should be considered when symptoms are not improving as expected, are becoming worse, or are interfering significantly with everyday functioning.

The CDC recommends talking with a healthcare provider when symptoms do not resolve within approximately two to three weeks or become worse after returning to normal activities.

The Ontario Living Concussion Guidelines consider symptoms lasting beyond one month to be prolonged and indicate that referral for specialized assessment or interdisciplinary concussion services may be appropriate at that point.

You may therefore want to discuss further assessment with a healthcare professional if you are experiencing:

• Symptoms continuing for several weeks without meaningful improvement
• Persistent headaches
• Ongoing dizziness or balance problems
• Difficulty concentrating or remembering information
• Significant fatigue
• Persistent visual difficulties
• Sleep problems
• Anxiety, depression or significant mood changes
• Difficulty returning to work or school
• Difficulty returning to exercise or normal daily activities
• Symptoms that improve and then repeatedly worsen with activity

The goal is not simply to confirm that symptoms exist. It is to understand which systems or factors may be contributing to them.

When Are Symptoms an Emergency?

Persistent symptoms are different from signs of a potentially serious acute neurological problem.

After a head injury, certain symptoms require immediate medical attention.

According to current CDC guidance, adults should seek emergency medical care for danger signs including:

• A headache that gets progressively worse and does not go away
• Repeated vomiting
• Increasing confusion, agitation or unusual behaviour
• Slurred speech
• Significant drowsiness or inability to wake up
• Weakness, numbness, burning or tingling in the arms or legs
• Seizures or convulsions
• Double vision
• Significant neck pain or tenderness

Why a Comprehensive Post-Concussion Assessment Can Be Helpful

When symptoms persist, evaluating only one symptom may not provide the complete picture.

For example, someone experiencing difficulty concentrating may assume that the problem is entirely cognitive.

But concentration can also be affected by:

• Poor sleep
• Headaches
• Pain
• Fatigue
• Anxiety
• Depression
• Visual problems
• Vestibular difficulties
• Medication effects

For this reason, current clinical guidelines recommend that prolonged symptoms be assessed according to the individual's most significant impairments, including areas such as headache, mood, sleep, vestibular and oculomotor function, cognition and neck pain.

At Neurotherapy Montreal, the Comprehensive Assessment of Post-Concussion Symptoms takes a multidisciplinary approach to evaluating ongoing difficulties after a concussion.

Rather than assuming that every persistent symptom has the same cause, the objective is to develop a clearer picture of the individual's recovery.

What Can a Post-Concussion Assessment Evaluate?

The exact evaluation should depend on the person's symptoms and history.

A comprehensive assessment may examine several areas.

Cognitive functioning

Cognitive testing can evaluate areas such as:

• Attention
• Memory
• Processing speed
• Executive functioning

This can help determine whether cognitive difficulties can be objectively identified and which areas appear most affected.

For people whose primary concerns involve memory, concentration or changes in thinking abilities, an Assessment of Cognitive Functions may also be appropriate depending on the clinical situation.

Physical and neurological functioning

A clinical examination may assess:

• Sensory responses
• Motor functioning
• Coordination
• Neurological signs
• Physical recovery

This can help identify issues that may require additional investigation or targeted rehabilitation.

Balance and vestibular function

Dizziness and balance difficulties are common after concussion.

Assessment may therefore examine balance, coordination and vestibular or oculomotor functioning.

Emotional and psychological functioning

Anxiety, depression, irritability and emotional changes can occur during concussion recovery.

Importantly, evaluating these symptoms does not mean that someone's physical symptoms are “just psychological.”

Physical, cognitive, emotional and sleep-related symptoms can interact with one another.

Identifying these factors can help create a more appropriate recovery plan.

Sleep

Sleep deserves particular attention because poor sleep can worsen:

• Fatigue
• Concentration
• Memory
• Mood
• Headaches
• Overall functioning

The Ontario guidelines specifically identify sleep, headache and mood symptoms as important priorities when managing prolonged concussion symptoms.

Do You Need an MRI or CT Scan for Persistent Concussion Symptoms?

Not necessarily.

CT and MRI scans are valuable medical tools, but they primarily examine the structure of the brain.

A concussion can occur without structural abnormalities appearing on routine imaging.

Whether imaging is appropriate depends on the circumstances of the injury, symptoms, neurological findings and medical history.

A healthcare professional may recommend imaging when there is concern about another structural or neurological condition, but imaging is not automatically required simply because concussion symptoms have persisted.

The decision should therefore be based on the individual's clinical situation rather than the duration of symptoms alone.

What About qEEG Brain Mapping?

Quantitative electroencephalography, or qEEG, examines patterns in the brain's electrical activity.

As we explain in our article What Is qEEG Brain Mapping and What Can It Tell Us? , qEEG provides a quantitative analysis of EEG data and can offer additional physiological information about patterns of electrical brain activity.

When clinically appropriate, it may provide additional information within a broader evaluation.

Clinical history, symptoms, cognitive testing, neurological examination, physical assessment and other appropriate investigations remain important parts of understanding persistent symptoms.

You can also learn more about the test itself through Neurotherapy Montreal's qEEG assessment service .

Can You Recover From Persistent Post-Concussion Symptoms?

Persistent symptoms can understandably become discouraging, particularly when they interfere with work, school, exercise, relationships or everyday activities.

But having symptoms several weeks or even months after a concussion does not mean that recovery is impossible.

The Ontario Living Concussion Guidelines emphasize a symptom-based approach to prolonged symptoms, with assessment and management directed toward the individual's specific difficulties.

Depending on the findings, recommendations may involve areas such as:

• Headache management
• Vestibular rehabilitation
• Physical therapy
• Cognitive rehabilitation
• Sleep management
• Psychological support
• Gradual return to physical activity
• Gradual return to work or school
• Treatment of associated medical conditions

Research also supports multidisciplinary approaches for people experiencing persistent symptoms after concussion, although treatment needs vary substantially between individuals.

The important point is that treatment should be directed toward the problems identified during assessment rather than applying the same recovery program to everyone.

Should You Completely Rest Until Your Symptoms Disappear?

Usually, prolonged complete rest is not recommended.

In the first days after a concussion, a brief period of relative rest may be appropriate.

But current guidance generally recommends gradually returning to normal activities as tolerated rather than remaining inactive until every symptom disappears.

The CDC advises that after the first one or two days, people can begin easing back into regular activities, reducing activity when symptoms significantly worsen.

Similarly, the Ontario Living Concussion Guidelines recommend gradual increases in activity during recovery.

The appropriate level and type of activity should still be individualized, particularly when symptoms persist.

What If Your Symptoms Are Affecting Your Ability to Work?

Returning to work after a concussion can be particularly challenging when symptoms involve:

• Concentration
• Memory
• Screen sensitivity
• Headaches
• Fatigue
• Noise sensitivity
• Multitasking
• Processing speed

Someone may feel relatively well at home but discover that several hours of computer work, meetings, commuting or complex decision-making causes symptoms to increase.

In these situations, assessment can help identify the specific difficulties interfering with work and inform recommendations for a gradual return.

Temporary accommodations might include adjustments to workload, breaks, screen exposure, working hours or task complexity depending on the individual's needs.

Recovery should focus not only on whether symptoms are present, but also on whether the person can safely and sustainably resume their normal activities.

The Key Question: What Is Keeping the Symptoms Going?

When symptoms continue after a concussion, it can be tempting to search for one test that will provide a definitive explanation.

In reality, persistent post-concussion symptoms can involve multiple interacting factors.

Headaches, sleep problems, cognitive difficulties, dizziness, pain, mood changes and fatigue can influence one another.

That is why a multidisciplinary assessment can be useful.

Instead of asking only whether the concussion is “still there,” the evaluation can focus on a more practical question:

That information can then help guide a more individualized recovery plan.

Key Takeaway

Most people recover from a concussion within the first few weeks, but some continue to experience symptoms for longer.

Persistent headaches, dizziness, cognitive difficulties, fatigue, sleep problems or emotional changes do not automatically indicate permanent brain damage. They also should not simply be ignored when they continue to interfere with daily life.

A comprehensive assessment can help determine which physical, cognitive, neurological, vestibular, sleep-related or psychological factors may be contributing to persistent symptoms.

At Neurotherapy Montreal, the Comprehensive Assessment of Post-Concussion Symptoms brings together multiple areas of evaluation to help clarify ongoing difficulties and guide individualized recommendations.

Frequently Asked Questions

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