Long COVID Through a Functional Psychiatry Lens

“Today I hoped for some relief. But ever since I had COVID, I have never fully recovered. The fatigue is overwhelming, and some days it feels difficult just to think clearly. Climbing the stairs leaves me short of breath. My sleep is poor, my mood is low, and my body aches in ways it never did before. I worry constantly about whether I will ever get my life back. My doctor seems at a loss. Are they even listening to me? They tell me my labs look normal and there is nothing more they can do.”

Call to Action

Long COVID joins a broader group of chronic, often debilitating conditions—including ME/CFS, fibromyalgia, dysautonomia, and related syndromes—that are characterized by multisystem symptoms, significant functional impairment, and historically limited treatment success despite frequently normal routine testing.

The American Psychiatric Association recommends that psychiatrists become competent in evaluating and managing neuropsychiatric sequelae of long COVID, emphasizing comprehensive treatment planning that addresses psychiatric and medical comorbidities through collaboration with other specialties.¹

Let’s follow a fictional patient named Sarah as she navigates her long covid journey to understand what we need to consider to assess and treat these patients.

When the Infection Ends but the Illness Remains: Sarah’s Story

Sarah was 55 years old when she got COVID-19. At first, she thought she was one of the lucky ones. She never required hospitalization. The fever passed within several days, the cough gradually improved, and everyone around her reassured her that the newer strains were “mild.” Her physician advised rest, fluids, and patience. She fully expected life to return to normal within a few weeks.

But it never did. Months later, Sarah still woke each morning feeling as though her body had been drained overnight. The fatigue was unlike anything she had experienced before. Not ordinary tiredness, but a profound physiologic exhaustion that sleep never seemed to relieve.

“Today I hoped for some relief,” she wrote in her journal one morning. “But ever since I had COVID, I have never fully recovered. The fatigue is overwhelming, and some days it feels difficult just to think clearly.”

She began forgetting words mid-sentence. Conversations became harder to follow. Climbing the stairs in her own home left her short of breath and shaky. Her sleep became fragmented and unrefreshing. Her muscles ached constantly. Anxiety slowly crept in—not only because she felt ill, but because nobody seemed able to explain why.

“My doctor seems at a loss,” she told her husband one evening. “Are they even listening to me? They tell me my labs look normal and there is nothing more they can do.”

As Sarah searched online late one night, she discovered she was far from alone.

Long Covid by the Numbers

A recent large systematic review estimated that roughly one-third of people infected with COVID-19 experienced lingering symptoms consistent with long COVID.² Other public health estimates were more conservative, suggesting that approximately 5–15% of infected individuals continue to experience symptoms lasting months after infection. Even the lower estimates translated into millions of people worldwide struggling with persistent fatigue, cognitive dysfunction, sleep disturbance, autonomic symptoms, pain, anxiety, and depression.³

For the first time since becoming ill, Sarah felt a small sense of validation. This was real.

What is Long Covid?

Long COVID refers to a condition in which symptoms persist or emerge weeks to months after acute COVID-19 infection and cannot be explained by another diagnosis. Patients often describe overwhelming fatigue, cognitive dysfunction, shortness of breath, autonomic symptoms, sleep disturbance, and diffuse musculoskeletal pain—exactly the constellation of symptoms Sarah was now living with daily.

And Sarah fit the profile.

Risk Factors for Long Covid

Research had shown that long COVID occurred more commonly in women, particularly in midlife. Risk factors included female sex, older age, elevated BMI, severe acute infection, preexisting medical illness, and a prior psychiatric history. Individuals infected during earlier pre-Omicron waves also appeared to have higher risk.^{4, 5}

Sarah had several of these risk factors. She was female, 55 years old, and had spent years managing chronic stress and intermittent anxiety while balancing work, caregiving responsibilities, and aging parents. Although her initial COVID infection was not severe enough to require hospitalization, she remembered the crushing chest tightness and breathlessness she experienced during the acute illness.

At the time, she assumed it would pass. Instead, her nervous system never seemed to fully reset.

Understanding the Physical and Neuropsychiatric Symptoms of Long Covid

One of the most frightening symptoms was what she called “the crashes.” If she pushed herself too hard physically, emotionally, or cognitively, she would pay for it later. A trip to the grocery store could leave her bedridden the following day. Even a stressful conversation sometimes triggered heart palpitations, dizziness, and waves of exhaustion. Her body no longer seemed capable of regulating energy normally.

As Sarah continued reading, she discovered that long COVID belonged to a broader family of chronic multisystem illnesses—including ME/CFS, fibromyalgia, and dysautonomia—conditions often marked by profound suffering despite relatively normal routine laboratory testing.

That realization struck deeply. For months she had worried that the absence of dramatic laboratory abnormalities somehow meant her illness was not legitimate.

Yet researchers were increasingly describing measurable physiologic disturbances beneath the surface: autonomic dysfunction, mitochondrial impairment, persistent inflammatory activation, endothelial injury, immune dysregulation, altered serotonin signaling, and abnormalities involving the gut-brain axis.

For Sarah, the science was strangely comforting. It gave language to experiences she had been struggling to explain.

She learned that neuropsychiatric symptoms after COVID-19 were remarkably common. Studies suggested that approximately one-quarter of long COVID patients experience clinically significant depression, anxiety, or stress symptoms, sometimes persisting for years after the original infection. Fatigue, insomnia, headaches, impaired concentration, memory problems, and cognitive slowing were among the most frequently reported complaints.^{6, 7}

Patients who had required ICU care or developed encephalopathy during acute infection appeared particularly vulnerable, but even people with relatively mild cases—people like Sarah—remained at increased risk for mood disorders, cognitive impairment, PTSD symptoms, and persistent autonomic dysfunction following infection.^{8, 9, 10}

Ironically, this knowledge relieved some of her fear. She was not “going crazy. “Her symptoms reflected a nervous system and immune system that had been profoundly disrupted.

The Connection between Long Covid and Inflammation

The science also began pointing toward something deeper than isolated symptoms. Researchers proposed that long COVID may involve persistent inflammation interfering with normal neurotransmitter production and energy metabolism. Some studies suggested lingering viral particles within the gut microbiome could continue triggering inflammatory pathways long after the initial infection had resolved.

Sarah became fascinated by the connection between inflammation and serotonin. She learned that chronic inflammatory activation can divert tryptophan metabolism away from serotonin synthesis, potentially contributing to depression, anxiety, sleep disturbance, and cognitive dysfunction. She also discovered that serotonin production depends on adequate levels of vitamins B6, B12, folate, vitamin C, vitamin D, riboflavin, and niacin, along with minerals such as iron, magnesium, zinc, copper, and selenium.

For the first time, Sarah began seeing her symptoms not as unrelated problems, but as interconnected physiologic systems struggling to regain balance.

A Functional Approach to Treating Long Covid

Her treatment approach gradually shifted. Instead of chasing isolated symptoms, her clinicians began focusing on improving the biologic terrain itself: reducing inflammatory burden, stabilizing autonomic function, restoring sleep and circadian rhythm, supporting mitochondrial energy production, pacing physiologic stressors, correcting nutritional deficiencies, and rebuilding physiologic resilience.

Some interventions helped modestly. Breathwork and HRV training reduced her episodes of physiologic overwhelm. Pacing helped prevent severe crashes. Nutritional repletion improved her sleep and cognitive clarity. A low-dose SSRI eased both anxiety and autonomic hyperarousal.

Later, her physician discussed emerging evidence surrounding low-dose naltrexone and low-dose aripiprazole for patients with fatigue, cognitive dysfunction, pain, and post-exertional symptom flares associated with long COVID. She later learned that psychostimulants were increasingly being explored in long COVID patients struggling with severe fatigue, impaired concentration, executive dysfunction, and “brain fog.” Some patients experienced meaningful improvement in cognition and daytime functioning, while others developed worsening anxiety, palpitations, insomnia, or post-exertional crashes.

Recovery came slowly, unevenly, and unpredictably. But over time, Sarah stopped measuring healing by whether she could instantly return to her old life. Instead, she began noticing smaller victories: a morning with clearer thinking, an afternoon without palpitations, the ability to walk farther without crashing, laughter that no longer exhausted her.

Long COVID changed Sarah’s understanding of illness. She entered the experience believing health was simply the absence of disease. She emerged understanding how deeply interconnected the immune system, nervous system, mitochondria, inflammation, sleep, nutrition, metabolism, and emotional resilience truly are.

Her illness had become more than a diagnosis. It became a living lesson in systems biology.

Although numerous therapies have been proposed, no universally effective treatment for Long COVID currently exists, and most evidence-based approaches focus on symptom management, autonomic stabilization, pacing, and functional rehabilitation. (CDC, 2026)

However, from a functional psychiatry perspective, there is often far more to assess and offer beyond the recommendations outlined in the APA consensus statement and CDC guidance. The foundational systems-biology approach emphasized in the Psychiatry Redefined Fellowship may not represent a miracle cure for Long COVID, but it provides a comprehensive framework for evaluating and addressing the complex physiologic disruptions these patients experience.

By assessing factors such as inflammation, autonomic dysfunction, mitochondrial health, sleep, nutritional status, metabolic function, environmental burden, and psychosocial stress, functional psychiatry offers multiple avenues for supporting recovery and improving quality of life. Importantly, we do not always know in advance which patients will respond most favorably or how substantial that improvement may be, but clinical experience suggests that many patients benefit meaningfully from this individualized and integrative model of care.