Cognitive Problems Persist in Patients with Long Covid

By Pat Anson, PNN Editor

About 70% of people with long covid have concentration and memory problems several months after their initial infection with Covid-19, according to new research at the University of Cambridge. The severity of the symptoms appears to be linked to the level of fatigue and headache people experienced during their initial illness.

Long covid is a poorly understood disorder characterized by body pain, fatigue, cognitive impairment and difficulty sleeping. About a third of people infected with coronavirus develop symptoms that can last for many months.   

In their study of 181 long covid patients, published in the journal Frontiers in Aging Neuroscience, researchers found that 78% reported difficulty concentrating, 69% had brain fog, 68% experienced forgetfulness, and 60% had trouble finding the right word to use in speech. They also performed poorly in cognitive tests, with significantly lower ability to remember words and pictures.

“This is important evidence that when people say they’re having cognitive difficulties post-COVID, these are not necessarily the result of anxiety or depression. The effects are measurable - something concerning is happening,” said co-author Muzaffer Kaser, PhD, a psychiatrist and researcher at the University of Cambridge. “Memory difficulties can significantly affect people’s daily lives, including the ability to do their jobs properly.”

The findings are further evidence that Covid-19 will have a lasting impact around the world, long after the pandemic subsides. Cambridge researchers say their study supports other findings that suggest society will face a “long tail” of workforce illness due to long covid.

“Long covid has received very little attention politically or medically. It urgently needs to be taken more seriously, and cognitive issues are an important part of this. When politicians talk about ‘Living with COVID’ – that is, unmitigated infection, this is something they ignore. The impact on the working population could be huge,” said senior author Lucy Cheke, PhD, a psychologist and lecturer at Cambridge.

To help understand the cause of the cognitive problems, Cheke and her colleagues investigated other symptoms that might be linked. They found that people who experienced fatigue and neurological symptoms, such as dizziness and headache, during their initial illness were more likely to have cognitive issues later on.

Participants were assigned to carry out multiple tasks to assess their decision-making and memory. These included remembering words on a list, and remembering which two images appeared together. The results revealed a consistent pattern of memory problems in people with long covid -- problems that were more pronounced in those whose initial neurological symptoms were more severe.

“People think that long covid is ‘just’ fatigue or a cough, but cognitive issues are the second most common symptom - and our data suggest this is because there is a significant impact on the ability to remember. There is growing evidence that COVID-19 impacts the brain, and our findings reflect that,” said Cheke.

Study participants were recruited between October 2020 and March 2021, when the Alpha variant and the original form of SARS-CoV-2 were still the dominant forms of the virus.

Very few of the patients had symptoms severe enough to be admitted to a hospital. But even among those who were not hospitalized, researchers found that people with severe initial symptoms were more likely to develop long covid than those with mild symptoms. They also found that people over 30 were more likely to have severe ongoing symptoms than younger ones.

“Infection with the virus that causes COVID-19 can lead to inflammation in the body, and this inflammation can affect behaviour and cognitive performance in ways we still don’t fully understand, but we think are related to an early excessive immune response,” said Kaser.

As is often the case with chronic illness, half of the patients with long covid reported difficulty getting medical providers to take their symptoms seriously, perhaps because cognitive symptoms do not get the same attention as respiratory problems.

The Cambridge study currently has no data on long covid associated with the Delta or Omicron variants of coronavirus, although new patients are being recruited to fill that void. The researchers say more studies are needed to understand the complex effects of Covid on the brain, cognition and mental health.

One way to reduce your risk of long covid is to get vaccinated. A UK study last year found that people who received the Moderna, Pfizer or AstraZeneca vaccines had significantly lower risk of an infection that turns into long covid.

Does Chronic Pain Affect Memory?

By Ann Marie Gaudon, PNN Columnist

Pain is a complex experience. It not only affects us biologically, but we also experience it cognitively and emotionally. Does it affect our memory? You bet it does.

Chronic pain patients often complain of memory problems and there are numerous studies which confirm these challenges are indeed a reality.

Twenty-four studies evaluating working memory (WM) and/or long-term memory (LTM) in chronic pain groups and control groups were reviewed last year by French researchers. WM was defined as the processing and manipulation of information within a short period of time (a few seconds), while LTM involved the “storage” of knowledge and memories over a long period of time.

Concentration and memory deficits on a daily basis were the most frequently reported cognitive difficulties. Memory complaints included forgetfulness and problems performing everyday tasks and conversations.

Emotional distress common to pain patients, such as depression, anxiety and rumination (the inability to divert attention away from pain), was also found to play an important role in memory difficulties.

One study compared two groups of pain patients who had minor or major memory complaints. Between the two, no significant differences were found with regard to age, gender, education level, marital status, medication use, long-term pain or pain intensity.

However, patients in the major memory complaint group suffered from emotional distress to a significantly greater degree. They also reported a lack of family support and discontent with their social and sexual lives. These were noted as additional daily sources of suffering for this group.

Adding to potential negative effects on memory were comorbidities which many pain syndromes share. Conditions such as depression, anxiety, sleep disturbances, and chronic fatigue could alone or combined affect memory. A major concern expressed was the need to disentangle pain-related cognitive effects from those resulting from these comorbidities.

Medications and Memory

The review really became interesting when it came to medication, because researchers found contradictory results. One European study reported that opioids exerted a negative effect on working memory -- finding a clear association between higher levels of analgesics and perceived memory dysfunction in chronic back pain patients. Some studies confirmed that medication can have a negative effect on memory, but others showed improvements in memory following analgesic treatment. That suggests that effective pain relief may also reverse pain-induced memory impairment.

The researchers concluded it was unclear whether analgesic medications are beneficial or detrimental, because both scenarios were reported.

Age was also identified as an important factor in the relationship between chronic pain and memory, but not in the way you may think. Surprisingly, it was shown that an increase in age did not additionally affect memory performance.

One study reported that gender and age significantly affected memory decline in those suffering from chronic migraine headaches. Cognitive decline in migraineurs was greater among younger individuals, and females showed greater decline during headache intervals than males. It was acknowledged that gender as a factor in pain-related experience is poorly investigated.

Like all reviews, this one has its limitations. There was a “large heterogeneity” of tests within the 24 studies. This diversity of tests did not allow for a suggestion of which memory processes were altered by chronic pain itself. The study populations were also heterogeneous regarding pain etiologies and an assessment of the intensity of pain was not performed.

Studies which included a mix of chronic pain disorders did not provide data on whether specific memory impairments were more frequently observed in specific disorders. The authors suggest there is a need for comparative studies across pain-related disorders in order to determine whether impairments are pain-related or a consequence of other pathophysiological features.

These numerous studies confirmed the memory decline that is often reported by chronic pain patients. Even if these effects are mild, the impact on quality of life could be substantial as they may indeed worsen suffering including depression, anxiety, and limitations on activity.

Researchers suggested that examining memory function should be part of the clinical assessment of chronic pain patients. The spectrum of cognitive difficulties must become acknowledged and understood in order to find ways to overcome them.

Ann Marie Gaudon is a registered social worker and psychotherapist in the Waterloo region of Ontario, Canada with a specialty in chronic pain management.  She has been a chronic pain patient for over 30 years and works part-time as her health allows. For more information about Ann Marie's counseling services, visit her website.

The information in this column should not be considered as professional medical advice, diagnosis or treatment. It is for informational purposes only and represents the author’s opinions alone. It does not inherently express or reflect the views, opinions and/or positions of Pain News Network.

Pain Companion: When Pain Hijacks Your Brain

By Sarah Anne Shockley, Columnist

I had a great inspiration for this article a couple of weeks ago and immediately forgot what it was. I exhausted myself, uselessly racking my brain for the idea I’d had. What was it I thought was so perfect to write for Pain News Network?

Several days went by with me trying to find the elusive idea. I couldn’t even figure out what it related to. It was as if it had completely left the universe and was utterly irretrievable. Gone without a trace.

Ever feel like that?

Studies have shown that chronic pain affects the brain, but most of us living with chronic pain don’t need researchers to tell us that. We live with brains that don’t seem to be firing on all cylinders every day. I don’t know if there is an official term for it, so I’m just calling it “Pain Brain.”

In this and my next column, I’ll discuss some of the ways in which Pain Brain affects our ability to cogitate -- and some practical ways I’ve found to live with it a little more gracefully and even to coax the brain back online.

Dealing with Blank Spaces        

Do you find yourself in the middle of a sentence and can’t remember what you were talking about? Sometimes can’t come up with the words for even the most common items like chair, book, pen? 

We worry that we might be getting Alzheimer’s and sometimes find ourselves very embarrassed when, in the midst of telling someone something important, our brains simply turn off.

We’re left with our mouths hanging open in mid-sentence, whatever we were just talking about an utter mystery to us. We draw a complete blank. Sometimes it’s just a word, but often it’s the whole concept. Just gone. This can be extremely disconcerting.                                    

I find, particularly when I’m tired, that I’m creating sentences with a whole lot of blank spaces in them. “Can you hand me the... the... the... the... you know, I mean, uh... the… the... the.....” You’ve probably done this too.            

Stop. Breathe. Relax. Laugh. Choose another word. Or just let it go and carry on without that word or even that idea. It’s not that your brain is dying, you’re in pain.            

I’ve found that it’s usually not all that helpful to exert a lot of energy to try and recapture the word I lost. I’ve found that my efforts usually don’t make a bit of difference. I can’t conjure up that exact word or thought no matter how hard I try - and I just wear myself out and get flustered.                   

Pushing your brain to get back into gear creates tension, and you don’t need any more of that. Trying to find the exact word leaves a longer silence in your conversation, and you get the deer-in-the-headlights look, and that’s when you begin to feel uncomfortable and embarrassed. You want to say, I’m not really stupid or senile or easily distracted, I used to be able to converse with the best of them!                   

Instead, just move on with the conversation. Usually, sooner or later, the words you need pop back in. Sometimes much later. Sometimes in the middle of the night. But that’s okay. If we can just be easy with it, it’s not that big of a deal. It’s usually more disconcerting for us than the person we’re talking with.

Dealing with Brain Freeze

There are times, however, when it’s more than a particular word that’s missing. For me, it’s often a total brain freeze. Everything comes to a screeching halt, usually in mid-sentence. I have no idea what I was just saying, what the topic of the conversation was, or what direction I was headed in.                  

It’s pretty strange, because you don’t lose the power of speech, you just have no idea what you’re talking about anymore. It’s like the part of your brain dealing with that specific subject goes on a coffee break in the middle of a sentence, leaving you kind of stunned by its complete lack of presence.

For friends and family members, you can make up a code word or phrase for when you’re feeling disconnected from your own brain. I often just say, Sorry, my brain just stopped. It’s short and to the point, and they’ve learned what it means. They either remind me of what we were talking about, or we move onto something else.                   

For other people who don’t know your situation, and if you find yourself embarrassed by your own stupefaction, you might try just changing the topic. It’s really strange, but the brain seems to be able to go somewhere else and work relatively well, just not where you wanted it to go at the moment.

You can also distract other people’s attention from your sudden silence by asking them a direct question such as, What were you saying a moment ago? Or simply, What do you think? If they have something they have to respond to, it usually diverts their attention from your blank stare.

If you refer to what they were saying indirectly, without having to remember exactly what it was they actually said, they will often fill in the blanks for you and help you back on track -- without you having to explain that your brain just stopped.

Living with Pain Brain can be challenging, but in my experience, those of us who struggle with it notice the blank spaces and lost words much more than anyone we’re conversing with.    

In my next column, we’ll talk about memory loss and lowered capacity to cogitate. I’ll have some suggestions for working with them as well.                                

Sarah Anne Shockley suffers from Thoracic Outlet Syndrome, a painful condition that affects the nerves and arteries in the upper chest. Sarah is the author of The Pain Companion: Everyday Wisdom for Living With and Moving Beyond Chronic Pain.

 Sarah also writes for her blog, The Pain Companion.

The information in this column should not be considered as professional medical advice, diagnosis or treatment. It is for informational purposes only and represent the author’s opinions alone. It does not inherently express or reflect the views, opinions and/or positions of Pain News Network.