We’re Not the Same: The Pandemic Brain
Doctors have a name for one of the most frightening neurological failures the human body can experience. They call it Ondine’s curse. It is a rare disorder in which the brain stem stops doing something that normally happens without thought: breathing. In healthy people, breathing is automatic. You do not even think about it unless there is a problem. Your brain stem quietly keeps the rhythm going while you sleep, while you talk, and while you forget about it entirely. But in patients with Ondine’s curse, that automatic system fails. If they fall asleep, they stop breathing. If they stop paying attention, they stop breathing.
It is so rare that doctors usually only see it in infants born with specific genetic mutations or in adults after catastrophic trauma to the brain stem. For decades, it was not something physicians associated with viral infections. Then the spring of 2020 arrived. At the height of the first wave in New York City, neurologists at the National Institutes of Health were asked to help investigate a series of unexplained deaths. The victims had died suddenly at home. There was no heart failure and no lung damage severe enough to explain what had happened. What investigators found instead was unsettling. The patients had simply stopped breathing. Not because their lungs failed, but because the control center for breathing in the brain stem had been damaged.
When researchers examined the brain tissue more closely, they discovered something horrifying. Neurons in the regions of the brain stem responsible for breathing had disappeared. In the lung tissue of those same patients, another discovery appeared: SARS-CoV-2, the virus that causes COVID-19. Months later, patients recovering from COVID began describing something even stranger. They reported moments when breathing no longer felt automatic, periods where they realized they had gone too long without inhaling, and in some cases an inability to fall asleep because the moment they drifted off, breathing stopped unless they consciously forced it.
For neurologists who study how viruses affect the nervous system, this pattern was not entirely unfamiliar. Similar phenomena had been seen before with other infections such as HIV, Ebola, and SARS. These are viruses that initially appear to target one organ system, only to reveal quieter and longer lasting damage in the brain. For a long time, medicine assumed that once you recovered from COVID, the story ended. But thousands of patients began reporting something very different: persistent symptoms, cognitive changes, and brains that no longer felt like their own. Suddenly, doctors began asking a much bigger question. What if COVID was never just a respiratory illness? What if it was also a neurological one?
If you are new here, welcome to The Dysfunction Files. If you have been here before, you already know that we ask uncomfortable questions and explore topics that intersect functional medicine, biology, government conspiracies, and of course, aliens. Today we are talking about something medicine is only beginning to admit. Something happened in 2020, and since then, we are not the same. This is the pandemic brain.
Let’s start with someone I will call Sarah. Sarah is not a real patient, but she is also every patient. She is forty-four years old, successful, organized, and the person everyone else depends on. Before 2020, her life ran on precision. Calendars were color coded. Deadlines were met early. Her kids’ schedules were memorized without thinking. Her brain was her advantage.
The first thing she noticed was not dramatic. It was a meeting. Halfway through a conversation she had held a hundred times before, she lost her train of thought. She was not distracted. She was not tired. The words were just gone. She laughed it off and blamed stress, too much screen time, and not enough sleep. Everyone felt off back then, so she kept going. Then came the word-finding problems. Simple words. Ordinary words. The kind that sit right at the front of your mind until suddenly they do not. Her kids noticed before she did. “Your phone is right in your hand, Mom.” “You already told us that story.”
Burnout makes you tired. Burnout does not make familiar thoughts feel unreachable. Something else was happening.
Around the same time, patients like Sarah started appearing in my office. Executives who could not track conversations. Mothers losing words mid-sentence. Teenagers unable to focus in school or complete exams. Professionals describing their minds as slower. Different people. Different lives. The same sentence: “I’m not the same.”
At first, medicine called it stress. Then burnout. Then anxiety. But a question started forming. What if this was not psychological at all? What if it was biological?
Sarah did what most people do when something feels wrong. She went to her doctor. Blood work was normal. MRI was normal. Thyroid was normal. Vitamins were normal. She was told she was stressed, maybe anxious, maybe burned out, maybe just getting older. She left with reassurance and a pat on the shoulder, but no answers. The symptoms did not stop. Meetings became exhausting. Multitasking was gone. Words arrived seconds too late. Her brain still worked, just differently.
Eventually, patients like Sarah started finding their way into offices like mine. Not because conventional medicine failed, but because conventional medicine was looking for the wrong kind of problem. When enough unrelated patients describe the same change, clinicians with critical thinking skills start asking different questions. Not psychological questions. Biological ones.
Since its emergence in early 2020, most adults in this country have been exposed to a novel pathogen infamously known as the spike protein. Through infection. Through vaccination. Most have had both, and most have had several rounds of each. Biology does not care how the spike got there. But it does know it does not belong there. So what is it doing all these years later?
Another question quickly follows. If billions of people were exposed, why do some seem to recover completely while others never quite return to baseline? Scientists do not have a full answer yet, but several biological clues are beginning to emerge.
One possibility involves immune regulation. After an infection or after vaccination, the immune system is supposed to process the antigen, learn from it, and then shut the response down. In some people, that shutdown may not happen efficiently. Prolonged immune signaling, delayed resolution of inflammation, and immune systems stuck in alert mode can allow the response to linger. This pattern is well described in other post-viral syndromes.
Another possibility is viral persistence. In people who were infected, researchers are investigating whether fragments of viral material may persist in certain tissues. Not necessarily live virus, but remnants. Studies have identified viral RNA or proteins months after infection in places like the gut, lymph tissue, and nervous system. Persistence of viral fragments does not mean ongoing infection, but it can mean ongoing immune stimulation.
A third theory involves blood vessels. Spike protein interacts with endothelial cells, the delicate lining of blood vessels. If inflammation occurs in those vessels, tissues with high energy demand, especially the brain, may be particularly sensitive. That connects directly to cognitive symptoms.
Not all immune systems respond the same way. Genetics, prior infections, metabolic health, microbiome diversity, baseline inflammation, mitochondrial resilience, mast cell reactivity, hormonal status, age, and stress load all likely influence how well someone recovers. The pandemic exposed biological differences that were already there.
At this point another question inevitably arises: does the source of spike exposure matter? Infection and vaccination introduce spike protein through different biological pathways. Infection exposes the body to a replicating virus. mRNA vaccines were designed to instruct cells to temporarily produce spike protein so the immune system can learn to recognize it. For many people that process appears to resolve normally. But researchers are studying why it may not resolve the same way in everyone.
In fact, researchers at Yale detected circulating spike protein in a subset of individuals long after vaccination. In that study, spike antigen was still detectable up to 409 days, which was the full duration of the observation period. That does not necessarily mean continuous spike production, but it does raise an obvious question. If we were told the shot would stay in the arm for a day or two, what is it doing in the circulatory system for more than 400 days? Scientists are still determining whether this represents delayed clearance, persistent immune signaling, or antigen retained within immune cells. What it does suggest is that biological variability matters. Medicine tends to look for one universal explanation. Biology almost never works that way.
Here is where the story takes an unexpected turn. Patients have described this pattern before, long before the pandemic. For decades, people diagnosed with ME/CFS, or myalgic encephalitis/chronic fatigue syndrome, described cognitive slowing, profound fatigue, sensory sensitivity, post-exertional crashes, and normal laboratory results. The pandemic did not invent this pattern. It may have revealed it. Sarah was not imagining her symptoms, and she was not alone. The question was no longer whether something had changed. The question was what exactly had changed inside the brain.
By the time Sarah arrived in my office, she was not looking for reassurance. She was looking for an explanation. Something felt wrong inside her brain even though every test said she was fine. This is where neuroscience starts to get interesting. For a long time, medicine treated the brain as separate from the immune system. Protected. Isolated. Untouchable. We now know that is not true. The brain is deeply connected to the immune system, and when the immune system stays activated, the brain notices.
It is also worth understanding one piece of the technology involved. The mRNA vaccines used a modified genetic instruction, a discovery that earned a Nobel Prize in 2023. Scientists replaced one of the normal RNA building blocks with something called methylpseudouridine. This modification helps the mRNA avoid rapid breakdown long enough for cells to read the instructions and produce spike protein so the immune system can learn from it. For most people that signal appears to resolve normally. But researchers are now asking whether differences in how individuals process and clear those signals may help explain why recovery looks different from person to person.
Inside the brain live specialized immune cells called microglia. Think of them as the brain’s surveillance system. Their job is protection, scanning for infection, injury, or danger signals. When activated briefly, microglia help healing. But when activation lingers, they change how the brain functions. Not by destroying neurons, but by turning down the signal. Processing slows. Memory retrieval becomes harder. Concentration fades faster. Sensory input feels overwhelming. The brain is still working, just operating in low power mode.
This state is called neuroinflammation. It is not swelling you can see on a scan, but immune signaling that alters communication between brain cells. Cytokines affect neurotransmitters. Synapses fire less efficiently. Networks lose coordination. Imagine trying to run high-speed internet through a network experiencing constant interference.
The brain also consumes enormous amounts of energy. Every thought, every memory, and every decision depends on mitochondria, the tiny energy generators inside cells. Inflammatory signals can suppress mitochondrial function. When energy production drops, cognition drops with it. Sarah did not lose intelligence. Her brain lost efficiency.
There is another layer researchers are investigating: the blood vessels that supply the brain. The lining of those vessels, called the endothelium, regulates oxygen delivery and blood flow. When endothelial inflammation occurs, even subtly, high-energy organs like the brain feel it first.
One of the more intriguing findings involves the cholinergic system, a signaling network that helps regulate attention, memory, and inflammation. Acetylcholine acts almost like a brake on immune activation, which may explain why some patients report temporary cognitive clarity with nicotine, a compound that stimulates nicotinic acetylcholine receptors. Not as a cure, but as a clue.
When you combine prolonged immune signaling, neuroinflammation, mitochondrial suppression, and vascular dysregulation, you may not see structural brain injury. You see functional change. A brain that works, just not the way it used to. For Sarah, this explanation mattered because it meant she was not imagining her symptoms. Her nervous system was stuck in a state it could not quite exit. The mystery was no longer whether something had changed. The mystery was how to help the brain find its way back.
Once Sarah understood what might be happening, the next question was obvious. What do we do about it? Understanding the mechanism only matters if it changes how we help people heal.
The first shift in my clinic was realizing there was not a single root cause. Patients were dealing with layered biological stress: immune dysregulation, mitochondrial strain, chronic inflammation, autonomic imbalance, mold exposure in some cases, and chronic infections in others. The pandemic did not create fragility in every case. But it exposed it.
The next step is calming the immune system. If prolonged immune activation is part of the problem, the goal is not stimulation. It is regulation. Many patients had already tried boosting their immune systems. What they needed instead was balance, anti-inflammatory support, and nervous system stabilization. The goal is not suppression. It is helping the immune system remember how to turn off.
Some strategies also focus on circulation and inflammatory signaling, including nattokinase, bromelain, curcumin, hyperbaric oxygen, ivermectin, nicotine, and low-dose naltrexone. Not as magical solutions, but as tools aimed at restoring physiologic balance.
If the brain is running in low-energy mode, supporting mitochondria becomes essential. That can include metabolic support, nutrient optimization, sleep restoration, glucose stability, and light movement before intense exercise. Patients often describe this phase as the moment the lights slowly start coming back on.
Many patients are also stuck in a persistent stress response state. The nervous system never fully exits survival mode. Recovery often involves restoring vagal tone, pacing, avoiding post-exertional crashes, and gradual reconditioning. Healing is not forcing the brain forward. It is convincing the nervous system that it is safe again.
One of the more surprising observations involves nicotine. Not smoking, but low-dose nicotine acting on cholinergic receptors that regulate attention and inflammation. For some patients, it produces temporary cognitive clarity. It is not a universal solution, and it is not appropriate for everyone. But it is biologically interesting.
And here is the truth. Recovery is rarely instant. Some patients improve quickly. Others recover slowly. Some plateau before reaching their previous baseline. But improvement happens often enough that we know the brain is capable of healing. Over time, Sarah’s cognition began to return. Not overnight, but gradually. Conversations became easier. Memory sharper. Energy more predictable. The goal was not to create a new brain. It was to help her nervous system remember its old balance.
But there is another layer to this story. Sarah did not just live through a virus. She lived through a world that changed almost overnight. The human brain keeps score of more than infection.
For years, we talked about the pandemic primarily as a medical event. But biologically, it was also a prolonged stress event affecting nearly every nervous system on Earth. Isolation. Uncertainty. Fear messaging. Sleep disruption. Constant digital exposure. Social division. Loss of routine. Loss of predictability. The brain evolved to handle short bursts of danger, not years of it.
Chronic stress changes biology. Elevated cortisol alters hippocampal function, the part of the brain responsible for memory. The prefrontal cortex, which governs focus and decision-making, becomes less efficient. The nervous system shifts toward vigilance instead of restoration. In survival mode, clarity is not the priority. Survival is.
Suddenly, the cognitive symptoms many people describe begin to make sense. Difficulty concentrating. Memory lapses. Emotional volatility. Exhaustion without explanation. Not weakness. Adaptation.
Without intending to, humanity conducted the largest neurological stress experiment in modern history.
Patients with ME/CFS have long described how infection followed by prolonged stress can lock the nervous system into dysregulation. Long COVID forced medicine to look more closely at that possibility. What we may be discovering is that the boundary between infection, inflammation, and stress is far thinner than we once believed.
Medicine prefers clean categories. Virus. Psychological. Neurological. But biology rarely separates things so neatly. The brain responds to the total load placed upon it. Sarah did not just need inflammation reduced. She needed safety restored, predictability, sleep, and calm signals to a nervous system that had been on alert for far too long.
Maybe the question is not why so many people feel different after the pandemic. Maybe the real question is why we expected them not to.
So where does that leave us? Patients like Sarah are not rare. They are signals. Signals that something in human biology, and perhaps human life itself, shifted during the past few years. Science is still catching up. Researchers are asking new questions. Clinicians are comparing notes. And slowly, medicine is beginning to acknowledge what many patients have felt all along.
Feeling different after a major biological and psychological event does not mean you are permanently broken. The brain is adaptive. The immune system is dynamic. Neuroplasticity is real. Recovery does not always happen quickly. But the nervous system wants equilibrium. Healing is not forcing the body forward. It is removing the obstacles that prevent it from finding balance again.
Maybe the pandemic did not just expose a virus. Maybe it exposed how deeply connected our immune systems, nervous systems, and environment truly are. Maybe the real lesson is not fear. It is humility. When large numbers of people say something has changed, medicine eventually learns to listen.
If this episode resonated with you, if you have felt different or watched someone you love struggle to feel like themselves again, you are not alone. Conversations like this are how understanding begins.
If you are new here, welcome. If you have been here before, thank you for being part of this community. If you found value in today’s episode, consider liking, subscribing, or sharing. It helps these conversations reach the people who may need them most.
I’m Dr. Kristen Lindgren. Thank you for tuning into another episode of The Dysfunction Files. Until next time, stay curious, keep learning, and never forget that you are in charge of your own healthcare. I will see you for the next one. Bye for now.
