Daniel had done everything right. At forty-three, he owned a thriving architecture firm in downtown San Luis Obispo. He’d designed award-winning buildings along the Central Coast, coached his daughter’s soccer team, and spent weekends hiking Bishop Peak with his wife. His friends called him the guy who had it all figured out. His parents beamed with pride at holiday gatherings.
But lately, sitting at his drafting table overlooking Monterey Street, Daniel felt something he couldn’t explain. Not sadness, exactly. Something heavier. A flatness that settled over everything like morning fog off the coast that simply wouldn’t burn off. He found himself staring at his completed designs and thinking, What is any of this actually for? He’d wake at three in the morning with a hollow ache in his chest and a single question looping through his mind: Is this really all there is?
He wasn’t grieving a loss. He hadn’t experienced a major setback. Nothing in his life had changed. And yet something fundamental felt wrong—as though the scaffolding that had always held his sense of purpose had quietly given way, leaving him standing in the middle of a life that looked perfect but felt profoundly empty.
If Daniel’s experience resonates with you, what you’re feeling has a name. And it’s more common than you might think.
Existential depression is a form of depression rooted in questions about meaning, purpose, and the fundamental nature of human existence. Unlike depression triggered by a specific event—a job loss, a relationship ending, a health scare—existential depression often arrives without an obvious cause. It emerges from an internal reckoning with life’s deepest questions: Why am I here? Does what I do matter? What’s the point of all of this if it all ends anyway?
While existential depression isn’t a separate diagnostic category in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), the experience is well-documented in clinical literature and widely recognized by mental health professionals. Individuals experiencing existential depression typically meet the criteria for major depressive disorder (MDD), but the character of their suffering centers on concerns about meaning, mortality, freedom, and isolation—what existential philosophers and psychologists have called the four “ultimate concerns” of human existence (Yalom, 1980).
What makes existential depression particularly disorienting is that it often strikes people who appear to have every reason to be content. High achievers, deep thinkers, and highly empathetic individuals seem especially vulnerable. Research has linked existential concerns to elevated rates of both depression and anxiety, suggesting that the capacity for deep reflection—while valuable—can also become a source of significant psychological distress when questions of meaning go unresolved (Boreham et al., 2023).
All depression shares common ground: persistent low mood, loss of interest in activities, sleep disruption, fatigue, difficulty concentrating. But existential depression has a distinct texture that both the person experiencing it and their treatment providers should understand.
The absence of an obvious trigger. Most people can point to something that preceded their depression—a breakup, a career setback, a traumatic event. Existential depression often has no identifiable external cause. Life may be going well by every objective measure, which creates a bewildering disconnect between circumstances and emotional experience.
Questions instead of sadness. While traditional depression often manifests as pervasive sadness or emotional numbness, existential depression frequently centers on unanswerable questions. The person isn’t simply feeling bad—they’re grappling with the fundamental structure of their experience. Why does anything matter? What happens after death? Am I living the right life? These aren’t idle philosophical musings; they’re consuming preoccupations that erode the ability to engage meaningfully with daily life.
Guilt about feeling depressed. Because nothing appears to be “wrong,” people with existential depression often carry an additional burden of guilt and self-judgment. The internal dialogue becomes: I have a beautiful family, a good career, a house on the Central Coast—what right do I have to feel this way? This guilt can prevent people from seeking help for months or even years.
Resistance to conventional reassurance. When someone with situational depression loses a job, friends and family can offer concrete support and realistic hope. But when someone is wrestling with questions about the meaning of existence itself, well-intentioned reassurance—”You have so much to be grateful for”—can feel dismissive rather than helpful. The person isn’t ungrateful. They’re experiencing a genuine crisis of meaning that positive thinking alone can’t resolve.
While existential depression involves philosophical and psychological dimensions, it is also a neurobiological event. The brain of someone experiencing existential depression isn’t simply “overthinking”—it’s functioning differently at a structural and chemical level.
Research has consistently linked a diminished sense of purpose in life to increased severity of both depression and anxiety. A comprehensive meta-analysis examining the relationship between purpose and mental health found that individuals with a lower sense of meaning showed significantly higher rates of depressive symptoms, with the relationship between purposelessness and depression being particularly robust (Boreham et al., 2023).
At the neurochemical level, existential depression involves disruptions across multiple brain systems. The glutamate system—the brain’s largest neurotransmitter network—plays a crucial role in how we process and assign meaning to experiences. When glutamate signaling becomes dysregulated, the brain’s ability to form new connections and perspectives is compromised. Neural pathways associated with reward processing, future planning, and emotional engagement become rigid and underactive.
Brain-Derived Neurotrophic Factor (BDNF), a protein essential for neuronal growth and adaptation, is often depleted in individuals with depression. Lower BDNF levels reduce the brain’s neuroplasticity—its capacity to reorganize, adapt, and form the new connections necessary for shifting out of entrenched thought patterns. When neuroplasticity is diminished, the rigid thought loops characteristic of existential depression—the endless cycling through unanswerable questions—become self-reinforcing. The brain gets stuck.
The default mode network (DMN), a collection of brain regions most active during self-referential thinking, tends to become hyperactive in depression. This is particularly relevant to existential depression, where the person spends excessive time in internal reflection about identity, meaning, and mortality. When the DMN dominates, the brain struggles to shift into the present-moment engagement that gives life its sense of richness and vitality.
Here in San Luis Obispo, existential depression carries a particular irony. This is a place regularly ranked among the happiest communities in America. The weather is mild, the landscape is stunning, the pace of life is enviable. The implicit message, reinforced by everyone from visitors to real estate agents, is that living here should make you happy.
But existential depression doesn’t respond to geography. You can wake up to an ocean view and still feel the weight of meaninglessness settling onto your chest. In fact, the gap between the life you’re “supposed” to appreciate and the emptiness you actually feel can make the experience more isolating, not less.
San Luis Obispo’s culture of outdoor recreation, wine tasting, and community involvement can mask deep internal struggles. The pressure to appear content—to match the sunny exterior of the place you call home—adds another layer of silence around what is already a profoundly lonely experience. People hesitate to admit they’re struggling when everything around them signals that they should be thriving.
Many of the patients we see at Innerbloom Ketamine Therapy describe this exact disconnect. They’ve tried yoga, meditation, hiking the trails, changing their diet. They’ve read the books and attended the workshops. And while these practices have genuine value, they can’t resolve a neurobiological condition that requires clinical intervention.
Traditional approaches to treating depression—cognitive behavioral therapy, psychodynamic therapy, and antidepressant medications—remain important first-line interventions. For many people, they provide meaningful relief. But existential depression can be uniquely resistant to these approaches.
Standard antidepressants, such as SSRIs and SNRIs, primarily target the serotonin and norepinephrine systems. While these medications help many patients, they don’t directly address the glutamate system dysregulation and diminished neuroplasticity that contribute to the rigid thought patterns characteristic of existential depression. When the brain is stuck in loops of meaninglessness, increasing serotonin availability may not be enough to break the cycle.
Talk therapy, while valuable, can sometimes inadvertently reinforce the ruminative patterns of existential depression. If the therapeutic process focuses heavily on exploring existential questions without also addressing the underlying neurobiology, the person may end up gaining intellectual insight without experiencing emotional relief. Understanding why you feel empty is not the same as no longer feeling empty.
This is where treatment approaches that target neuroplasticity—the brain’s capacity to form new pathways and perspectives—become particularly relevant. Ketamine therapy works through a fundamentally different mechanism than traditional antidepressants. By modulating the glutamate system and promoting rapid increases in BDNF, ketamine can help the brain break free from rigid patterns and restore the neural flexibility needed to engage with life in new ways.
For someone like Daniel, whose brain has become locked in a cycle of existential questioning, ketamine’s ability to enhance neuroplasticity may open a window of cognitive flexibility. That window doesn’t hand the person prepackaged answers to life’s deepest questions—but it can restore the capacity to engage with those questions from a place of curiosity rather than despair.
Ketamine works differently from any other treatment currently available for depression. Rather than slowly adjusting neurotransmitter levels over weeks, ketamine rapidly modulates the glutamate system, triggers a surge of BDNF, and promotes the formation of new synaptic connections—often within hours of treatment.
For existential depression specifically, this neuroplasticity boost is significant. The rigid neural pathways that keep the brain cycling through meaninglessness, purposelessness, and despair begin to loosen. Patients frequently describe a shift in perspective that feels less like the absence of pain and more like the return of possibility—a renewed capacity to see meaning in their relationships, their work, and their daily experiences.
At Innerbloom Ketamine Therapy in San Luis Obispo, treatment is administered in a private, comfortable setting under the direct supervision of Dr. Ray Rivas. Patients can receive IV ketamine for the most precise dosing and highest bioavailability, or intramuscular (IM) ketamine depending on their individual needs. For those who may benefit from a deeper psychological component, ketamine-assisted psychotherapy (KAP) with certified therapist Cindy Nelson, LMFT, combines the neuroplasticity effects of ketamine with guided therapeutic exploration—an approach particularly well-suited to existential depression, where processing questions of meaning and identity is central to healing.
Ketamine is not a first-line treatment, and it’s not appropriate for everyone. But for individuals who have tried therapy and traditional medications without adequate relief—people who continue to struggle with deep questions of meaning despite doing “everything right”—it represents a different kind of possibility.
Daniel didn’t wake up one morning with all his existential questions answered. That’s not how healing works—for anyone. What shifted was his relationship to those questions. They stopped being a source of crushing despair and became, instead, something he could sit with. He began to find meaning not in the grand, abstract sense he’d been searching for, but in the texture of his days—the way light fell across a blueprint, the sound of his daughter laughing in the next room, the quiet connection of a shared meal with his wife.
If you recognize yourself in Daniel’s story, know that what you’re experiencing is real, it’s neurobiological, and it’s treatable. The emptiness you feel isn’t evidence of ingratitude or personal failure. It’s a signal that your brain needs support that lifestyle changes and willpower alone can’t provide.
You don’t have to figure out the meaning of life before you can feel better. Sometimes, feeling better is what allows meaning to find you again.
Dr. Rivas is a ketamine specialist and board-certified acute care and trauma surgeon with over 12 years of experience in ketamine administration. Before founding Innerbloom Ketamine Therapy in 2022, Dr. Rivas served on the frontlines of emergency and trauma medicine in Santa Maria, CA, and Austin, TX. Dr. Rivas applies his extensive medical expertise to provide safe, evidence-based ketamine treatments for mood disorders, including depression, anxiety, PTSD, and chronic pain. His passion lies in helping patients find relief and rediscover hope through personalized, compassionate care.
A supplement formulated by Dr. Rivas for enhanced brain and mood support. The formula pairs especially well with ketamine therapy by helping extend and enhance the neuroplasticity effects. That said, the ingredients are equally effective on their own, so it’s a supportive option whether or not someone is undergoing ketamine treatment. Learn more about how Newy supports cognitive function detoxification and cellular repair.
Boreham, I. D., Schutte, N. S., & O’Sullivan, D. (2023). The relationship between purpose in life and depression and anxiety: A meta-analysis. Journal of Clinical Psychology, 79(12), 2736–2767. https://onlinelibrary.wiley.com/doi/full/10.1002/jclp.23576
Berra, L. (2019). Existential depression: A nonpathological and philosophical-existential approach. Journal of Humanistic Psychology, 62(2), 263–283. https://journals.sagepub.com/doi/abs/10.1177/0022167819834747
Duman, R. S., Aghajanian, G. K., Sanacora, G., & Krystal, J. H. (2016). Synaptic plasticity and depression: New insights from stress and rapid-acting antidepressants. Nature Medicine, 22(3), 238–249. https://pubmed.ncbi.nlm.nih.gov/26937618/
Abdallah, C. G., Sanacora, G., Duman, R. S., & Krystal, J. H. (2018). The neurobiology of depression, ketamine and rapid-acting antidepressants: Is it glutamate inhibition or activation? Pharmacology & Therapeutics, 190, 148–158. https://pubmed.ncbi.nlm.nih.gov/29803629/
Alavi, N., Sunderji, N., & Ghahari, S. (2024). The prevalence of existential anxiety and its association with depression, general anxiety, and stress in Saudi university students. Middle East Current Psychiatry, 31, 43. https://mecp.springeropen.com/articles/10.1186/s43045-024-00435-4
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Struggling with depression that won’t respond to traditional treatments? Contact Innerbloom Ketamine Therapy at (805) 592-5085 or visit us at 100 Casa Street, Suite D3, San Luis Obispo, CA 93405. We offer complimentary consultations to discuss whether ketamine therapy might be right for you.