Post-concussion syndrome

What are concussion aftereffects?

For most people, symptoms after a concussion begin to gradually fade within the first few weeks. However, for some, symptoms last longer and continue to affect daily life.

This is often referred to as concussion aftereffects.

In the healthcare sector and research literature, terms such as persistent post-concussion symptoms, prolonged concussion symptoms, and post-concussion syndrome (PCS) are also used. These terms essentially describe the same situation: that symptoms continue longer than expected after a concussion.

There is no fixed time limit, but many international guidelines recommend that individuals with persistent symptoms after approximately four weeks receive a more thorough assessment.

If you haven't yet read about the common symptoms of a concussion, we recommend that you start here.

Read also: Symptoms of a concussion → (internal link)

Why do symptoms persist for some?

This is one of the questions researchers have worked on most over the past many years. Previously, it was believed that aftereffects were primarily due to the brain still being affected by the injury itself. Today, we know that the explanation is often more complex. For the vast majority, the acute biological changes in the brain have subsided after the first few weeks. Nevertheless, symptoms can continue. This does not mean that the symptoms are imagined or "just psychological." On the contrary, research shows that aftereffects are often due to an interplay between several different factors.

Why are aftereffects about more than just the concussion itself?

A concussion affects more than just the brain.

It also affects the body, the nervous system, and the daily life one has to function in.

Therefore, it is rarely a single factor that explains why symptoms persist. It is often the interplay between several conditions.

This way of understanding long-term symptoms is called the biopsychosocial model and currently forms the basis for many international recommendations on treatment and rehabilitation.

Biological factors

The concussion itself can lead to symptoms such as headaches, dizziness, fatigue, sensitivity to light and sound, or neck pain.

Some people also experience migraines, tension headaches, or other health conditions that can affect the recovery process.

Psychological factors

When symptoms persist, it is completely natural to feel uncertain.

Many people start asking themselves questions like:

Am I allowed to go for a walk?

Am I allowed to exercise?

Am I doing something wrong?

Will I ever be myself again?

This uncertainty is a natural reaction to a situation that can be difficult to understand and predict. At the same time, worry, stress, and lack of sleep can increase the strain on the nervous system.

Social factors

A concussion rarely affects only the individual.

Work, studies, family, finances, and expectations from those around you can all influence how symptoms are experienced.

When the demands of everyday life exceed what the body can handle, symptoms will often intensify.

This does not necessarily mean that the brain is being damaged. It is often a sign that the load exceeds what the body can manage right now.

What happens in the nervous system?

One of the most important things to know is that long-term symptoms do not necessarily mean that the brain is still damaged.

For some people, the nervous system becomes more sensitive after a concussion.

You can compare it to a smoke alarm.

Normally, it only reacts when there is danger.

But if it becomes too sensitive, it can also go off when you make toast or fry bacon.

The alarm still works – but it reacts more strongly than the situation requires.

In the same way, a sensitive nervous system can start reacting to activities that were previously completely unproblematic. This could be screen work, a trip to the supermarket, exercise, or many sensory impressions at once.

The symptoms are real.

But they do not necessarily mean that new damage is occurring in the brain.

This is also why treatment for long-term effects is often about gradually helping the nervous system to once again experience ordinary activities as safe and manageable.

Why do symptoms fluctuate?

One of the most frustrating things about long-term effects after a concussion is that symptoms rarely develop in a straight line.

Many experience days where they feel almost recovered, followed by days where the headache, dizziness, or fatigue suddenly return.

This can create uncertainty.

Have I gotten worse again?

Did I do something wrong?

In most cases, the answer is no.

It is completely normal for symptoms to vary along the way.

Often, these fluctuations are linked to the total load the body has been subjected to. This load can be physical, mental, or social and builds up over several hours or days.

This also means that symptoms do not always appear immediately. You might have a good day, but only feel the consequences later in the day or the following day.

What can contribute to maintaining the symptoms?

When symptoms persist, it is rarely due to a single thing.

Often, there are several factors that influence each other.

This could, for example, be:

• headaches or migraines
• neck pain
• dizziness or balance issues
• sleep problems
• stress and worries
• uncertainty regarding activity
• a daily life with many demands and a fast pace

For some, it becomes difficult to find the balance between activity and rest.

Some end up pushing themselves too hard on the good days and have to pay the price afterwards.

Others become so worried about getting more symptoms that they gradually start avoiding more and more activities.

Both reactions are understandable.

But both can make it harder to return to a daily life with fewer symptoms.

Therefore, treatment is often about finding a balance where the load can be gradually increased without causing unnecessary setbacks.

Is it possible to recover?

Yes.

Most people with post-concussion syndrome experience gradual improvement over time.

How long it takes varies from person to person and depends, among other things, on which symptoms you have, how long they have lasted, and which factors affect them.

Unfortunately, there is no treatment that helps everyone.

On the other hand, research shows that many benefit from an individual and targeted effort, where the treatment is based on their specific symptoms and daily life.

The most important thing is therefore not to find a single solution, but to understand what is maintaining the symptoms for the individual.

How are post-concussion symptoms treated?

There is no single standard treatment that fits everyone.

Treatment should be based on the symptoms and challenges that are most prominent.

For some, the headache is the greatest limitation.

For others, it is dizziness, mental fatigue, sleep problems, or uncertainty regarding activity.

At Hemi, we work across disciplines when it makes sense.

Depending on your symptoms, treatment may include:

• neurological assessment and medical treatment
• specialized physiotherapy
• pain management
• neuropsychological treatment
• work-oriented social work support
• counseling on a gradual return to work or studies

The goal is not just to reduce symptoms.

The goal is to help you gradually regain function, confidence, and a daily life with fewer limitations.

Read more about our treatment of post-concussion symptoms → (internal link to the treatment page)

When should you seek help?

If symptoms persist beyond four weeks, or if they significantly impact your daily life, it may be a good idea to get an assessment from a practitioner with experience in long-term symptoms following a concussion.

This is especially true if:

• the symptoms are getting worse instead of gradually improving
• you are having difficulty managing work or studies
• you are experiencing persistent headaches or dizziness
• you are having difficulty being physically active
• the symptoms are limiting your family or social life
• you are unsure about how best to move forward

The better you understand your symptoms, the easier it often becomes to create a plan that suits your individual needs.

Frequently asked questions

Are long-term effects after a concussion the same as post-concussion syndrome?

Yes.

Both terms are used to describe symptoms that persist longer than expected after a concussion. Today, terms such as persistent symptoms or long-term symptoms after a concussion are also used.

Is it normal for symptoms to fluctuate?

Yes.

It is actually one of the most characteristic features of long-term effects after a concussion.

Symptoms can vary from day to day and are influenced by factors such as total workload, sleep, stress, and activity level.

Do long-term effects mean that the brain is still damaged?

Not necessarily.

For the vast majority, the acute biological changes in the brain have subsided. Persistent symptoms are often due to a complex interplay of several factors, which is why an individual assessment is important.

Is a full recovery possible?

Yes.

Many people with lingering symptoms experience gradual improvement, even if the symptoms have persisted for a long time.

The recovery process is individual, and treatment should be as well.