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Personality Changes After a Brain Injury or Concussion: Irritability, Sadness, Social Struggles, and More
Dr. Alina Fong PhD

By: Dr. Alina Fong PhD on January 6th, 2020

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Personality Changes After a Brain Injury or Concussion: Irritability, Sadness, Social Struggles, and More

Mental Health Support After a Brain Injury  |  Brain Injury Awareness  |  Education & Resources

Personality changes (or what feels like them) are common following a traumatic brain injury. Even a concussion can affect the brain long after it’s healed from the initial injury. The way we process and understand information can change as a result of the injury, so it’s not surprising that our emotions are affected too.

Many people suffer from social anxiety, irritability, anger, depression, feelings of overwhelm, general anxiety, mood swings, or emotional lability (teariness) after their injury. But make no mistake: While these symptoms can make it seem like you’re a different person now, your personality is intact. It’s just buried under the weight of symptoms that are so, so hard to handle.

Think of personality as a collection of traits, and your mood as your current state of being. Normally, our moods don’t last for weeks or months on end. But after a head injury, negative moods like sadness, anxiety, or irritation can drag on, making patients and their families mistake the emotional symptoms for personality changes.

The reality is that most post-concussion personality changes are actually from symptoms that will go away if you get the right treatment. 

Undergoing these emotional changes or watching your loved one suffer through them isn’t easy. It’s really, really hard. It’s OK to be frustrated with the changes, struggle to understand them, or grieve for the past. 

But if you’d like to learn more about why they’re happening and what you can do about it, keep reading. We’ll cover…

Note: Over 80% of our patients have experienced emotional symptoms after a concussion. Many of those symptoms resolve shortly after treatment at our clinic (although serious mental health issues like depression and anxiety can take additional therapy to resolve). If you’d like to learn more about how we can help you, book a free consultation.

Why You Experience Mood Changes (Personality Changes) After Head Injury

Personality changes after a brain injury may not be permanent; often, patients only need treatment to find relief from emotional and behavioral symptoms.

Personality changes can originate from two sources following a brain injury:

  • Specific physiological changes in the brain, which affect how it takes in, processes, and perceives information. 
  • Emotional reactions (a natural response) to the changes in your life brought on by a brain injury.

On the most basic level, a concussion can disrupt the connections between neurons and the blood vessels in your brain (called neurovascular coupling). In most post-concussion patients, those pathways return to normal after a few weeks. But in as much as 30% of concussion patients, this altered, inefficient way of processing information and responding to the brain’s needs results in long-lasting symptoms. Read more about persistent post-concussion symptoms and why they happen here.

Note: Keep in mind that you can have lingering symptoms from even a quote-unquote “mild concussion.” Every brain injury—even ones that don’t stem from a blow to the head — can cause serious symptoms and may need treatment to resolve.

The location of the injury can contribute too. Brain injuries can damage connections that go from the cerebral cortex (the part of the brain that has a role in memory, attention, perception, cognition, and awareness) to the limbic system (the part of the brain that supports functions like emotions, behavior, and motivation).

These connections allow us to evaluate our emotional reactions, understand how important events are, and decide on a response appropriate for the situation. When these connections are injured, the emotional response differs from what it was before the injury and is not always in sync with the current situation. 

The hippocampus is a part of your brain known for converting short-term memories into long-term memories. Your memories advise how you respond to your environment or the world around you, including determining your emotional response. About 63% of the patients we see at Cognitive FX have abnormal fMRI scans in one or both of their hippocampi.

In other words, there are ample opportunities for a brain injury to disrupt the way your brain normally processes information and emotions, leaving you vulnerable to a host of unpleasant mood changes. But those mood changes don’t have to last forever: Brain dysfunction after a concussion is not the same as irreversible brain damage.

Finally, don’t discount the trauma you’ve experienced: It’s normal to be upset and frustrated after sustaining a life-changing injury. It can take time to process your emotions and return to some kind of "normal."

Post-Concussion Emotional Symptoms

A brain injury is emotionally traumatic. It is normal to mourn the life you once had and to try to find ways to cope with ongoing symptoms. Brain injury survivors can be affected by the impaired connections described earlier and may have unexpected behavioral changes.

If your brain has dysregulated neurovascular coupling, that means some regions of your brain regions are hypoactive (not doing their fair share) and some are hyperactive (trying to do too much or burning more resources than they should for the tasks they’re completing). Either way, your brain has to work overtime to do what it’s supposed to do.

That makes it very easy for you to be overstimulated: Overwhelmed by sensory inputs like light and noise and cognitive inputs like a conversation, reading, or work. That overstimulation can be the culprit behind many emotional symptoms.

Let’s explore each.

Anger and Irritability After Concussion

Many of our patients report irritation and impatience in their daily lives. For example, this attorney (who was injured in a car accident) was unable to fix a broken ice maker, which caused him to explode at family members. Previously, it wouldn’t have bothered him at all.

After head trauma, it’s easy to react more dramatically to a given situation than you would have before the injury. Why? Because you’re already dealing with so much! 

If you have lingering post-concussion symptoms, then your body and brain are trying to handle more than they ever had to before. What was previously a minor inconvenience feels like a national emergency to a brain that’s already juggling more than it can handle.

That overstimulation is behind much of the irritation, angry outbursts, and mood swings you may experience after a head injury. Try to remain patient with yourself and look for ways to keep yourself from getting overstimulated. (We’ll provide some tips later in the post.)

Also, keep in mind that you may have unresolved feelings of anger at the situation you’re in. Most people don’t expect to have lingering symptoms. They didn’t ask for their injury. They might be belittled by their doctors and start to doubt themselves. That confusion and frustration can absolutely contribute to emotional difficulties.

Anxiety After Concussion

A traumatic even causes the anxiety system to overactivate and may cause persistent anxiety.

After a concussion, you may find yourself worrying in ways you never did before. Or, you may find that your previous worrying becomes even worse. Feeling on edge, struggling to fall and stay asleep, and constantly thinking about what could go wrong is characteristic of concussion anxiety.

We’ve written a whole post on the topic of post-concussion anxiety. You can read that post to learn more about why concussions can result in anxiety and how to cope. If you think you’re suffering from post-traumatic stress disorder, read our post on concussion-related PTSD instead.

Depression After Concussion

Depression after a concussion is common, especially if you’ve suffered from depression in the past.

A recent study showed that students who have experienced a concussion have a higher risk of self-harm, depressive symptoms, attempted suicide, injury from attempted suicide, and overall poorer mental health outcomes. Another study showed that the suicide rate was almost twice as high among individuals with TBI than those without a brain injury. Finally, people who sustained multiple brain injuries are at increased risk of depression and suicide.

Seek professional help immediately if you experience suicidal thoughts. Your life is worth living and you can get better. For immediate assistance, call the national suicide prevention lifeline: 1-800-273-8255. Follow up with a local psychological care provider.

Read this post to learn more about depression after a mild traumatic brain injury.

Emotional Lability After Concussion

It’s normal to cry from feelings of grief or loss after an mTBI results in lingering and traumatic symptoms. In fact, it’s healthy to cry and process some of the emotions you’re feeling.

But some patients find themselves confusedly crying over trivial matters or for seemingly no reason. If you find yourself teary-eyed after commercials, you are likely experiencing something called emotional lability. Emotional lability causes uncontrollable tears (or laughter), sometimes at the most inconvenient moments.

In post-concussion patients, this can be related to overstimulation—it may be your body’s way of coping when your brain can’t handle everything it needs to. Rather than being frustrated with yourself (or, if you’re a family member, getting angry about the crying), handle the situation with levity. It’s healthier to laugh and acknowledge that the tears are out of your control than to struggle against them and increase your frustration.

Impulsivity After Concussion

Concussions can cause memory loss, long or short-term memory problems, difficulties with focus and conversation tracking, brain fog, and more. It shouldn’t come as a surprise that head injuries can affect impulse control as well.

In fact, we often see concussion and ADD together. Teasing out exactly what’s responsible for impulsivity requires examination by an experienced clinician.

For example, we might use imaging to discover that the concussion caused dysregulation in the cingulate gyrus or anterior insula, both of which are brain regions involved in emotions and impulse control. Or, impulsivity and behavioral changes could arise from sleep disruption due to the injury.

All of those causes are treatable, but you have to know what the root issue is in order to solve it, which means visiting a doctor who can correctly diagnose the problem.

Social Struggles After Concussion

A common complaint we hear from patients is that they used to be outgoing, but now they don’t want to visit friends or spend a night out. It’s not that you switched from being extroverted to introverted: Instead, your symptoms are likely causing that "night on the town" to cease being fun.

Avoiding social functions might be rooted in a symptom like fatigue — some people are just too tired to go out. Or, it might be that you no longer enjoy conversations because you struggle to follow what everyone is saying. Maybe finding the right words to say is difficult and frustrating. Perhaps the noise or light contributes to your headaches. Maybe you just get overstimulated quickly.

There are so many reasons why post-concussion patients avoid social outings. The good news is that none of them involve permanent personality trait changes.

What to Do with These Emotions

image of a woman helping a younger woman work through feelings by writing them down and talking about it

While we recommend working with a psychologist or neuropsychologist to cope with emotional changes until you’re able to receive treatment for post-concussion syndrome, there are a few things you can do (with or without the help of a therapist).

Identify Your Triggers

Identify your triggers, especially for overstimulation. What do you feel right before an angry outburst or before you get overwhelmed? If you know when you’re headed for trouble, it’s easier to change course. For example, some patients notice feeling brain fog, dizziness, or nausea.

Get a Family Member to Help

If you’re comfortable with it, have trusted family members monitor your overstimulation. They might pick up on cues that you don’t notice, like getting a glassy-eyed look. They can tactfully remind you to take care of yourself and destimulate.

Make a Destimulation Plan

Speaking of destimulation, have a plan for when you’re getting overwhelmed. You might hide in the bathroom for five minutes (or any quiet room you can find), close your eyes for a bit, or even purposefully disengage from your current activity (e.g., if you’re stuck in a lecture hall, you might need to “space out” for a few minutes).

Name the Emotion

Name each emotion you’ve experienced postinjury. Examine how your feelings about yourself have been affected by these changes. Sometimes, just acknowledging and understanding what has happened to you can help.

Get Some Exercise

Some folks have difficulty exercising after a concussion, but it’s still important to do whatever exercise you can do safely. It will help relieve stress and tension, plus it provides your brain with a biochemical boost to help it handle the day’s needs. This post on post-concussion exercise can help you get started.

Keep a Journal

Don’t have anyone to talk to? Struggling with verbal expression of your feelings? Just need another outlet? Journaling can help with that. It gives you a way to process your thoughts and feelings on your timetable.

Above All, Get the Right Treatment

Long-lasting symptoms will not resolve without treatment. If you’ve experienced emotional problems and other common concussion symptoms for over three months, it’s time to seek help. We’ll explain what that looks like in the next section.

Getting Treatment for Post-Concussion Emotional Changes

A man stares out at the sunset

Treating a brain injury isn’t one size fits all. Many programs will provide the same 2-3 therapies for every patient that comes through their program. Some get better, but some don’t. That’s because concussions don’t cause brain dysfunction in the exact same brain regions for everyone. Knowing which regions to treat means you can tailor the treatment experience to the individual person.

That’s why our assessment includes an fNCI scan. It allows us to see which brain regions were affected by the concussion(s). Here’s an example of one of our patients explaining a portion of her fNCI results:

fMRI Matrix Reasoning Test Findings for Olivia

Olivia: “The fNCI showed that my thalamus was hypoactive and my basal ganglia was completely out to lunch. Three standard deviations from normal basically means that there was no activation seen in that area on the fMRI. All the work was being routed around it — causing fatigue and stress on the rest of my brain. The inferior frontal gyrus was trending toward hyperactive (using too many resources for given tasks).”

Once we’ve finished evaluating patients (collecting data on their physical response times, cognitive function, and medical history in addition to the fNCI scan), it’s time to get to work.

We use a combination of exercise and multidisciplinary therapies, including (but not limited to) cognitive, occupational, neuromuscular, and sensorimotor therapy. Patients meet with a psychologist at least twice during treatment.

To make treatment as effective as possible, patients engage in supervised aerobic activity. Cardio exercise results in a Post Exercise Cognitive Boost (PECB): an increase of essential neurotransmitters and proteins in your brain that help develop and promote healthy blood flow. The PECB means your brain is in better condition to tackle the challenges we give you in therapy and engage in neuroplasticity for recovery.

At the end of the week, every patient gets a second fNCI scan so we can see how well their brains are progressing. The average improvement on the second scan is 77%! If patients keep up with their homework after treatment, they typically see further improvement at home.

In the clinic, we’re primarily focused on resolving brain dysfunction. When that happens, many of the emotional and behavioral changes resolve too.  Each patient is also assessed for psychological disorders (like PTSD and depression).  We make sure that every patient has a tailored plan to continue appropriate therapy in their hometown (if needed). Recovery is far easier when the primary issue — brain dysfunction due to injury — is better.

Note: If you’d like to learn more about how we can help you recover, sign up for a free consultation with our team.


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About Dr. Alina Fong PhD

Alina K. Fong received her PhD in Clinical Neuropsychology with an emphasis in neuroradiology from Brigham Young University. She received the national American Psychological Association Clinical Neuropsychology Division 40 Graduate Student Research Award in 2004 for her research on "Cortical Sources of the N400 and 'The N400 Effect." Dr. Fong's interest in brain mapping soon turned to functional MRI, and since then, her research efforts have been focused on the clinical applications of fMRI.

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