The Clinical Reality of Long-term Stress
I am 73 years old. I am a fitness professional specializing in Senior Health and Fitness (solidtothecore.com). I train 8-10 hours a week: resistance work, cycling, HIIT, yoga. By any conventional measure, I am a healthy, high-functioning human.. I have a B.S. in Biological Chemistry.
I am also a full-time caregiver. For eighteen years I have been the primary support for my wife of more than forty years, who sustained four cardiac arrests in 2008 that left her with permanent cognitive impairment and memory-loss. We have built a life inside that reality. It has been an act of love. It has also been an act of slow, cumulative physiological cost that I am only now beginning to fully account for. This ongoing journey is a testament to the challenges of long-term caregiver stress, reminding me daily of the impacts that long-term caregiver stress can inflict.
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This past year I decided to stop assuming I was fine and start finding out whether I was fine. I dug into the scientific and clinical literature to better understand the data on my lifestyle. what I found in the clinical literature didn’t surprise or shock me. I feel the wear and tear. And I stay positive most of the time.
“The research does not describe caregiving as emotionally hard. It describes it as biologically aging.”
This piece is what I learned. It is part personal reckoning and part clinical briefing. If you are a long-term caregiver, a spouse, a partner, an adult child, a devoted friend, some of what follows may feel uncomfortably familiar. That familiarity is not weakness. It is data that leads to knowledge.
Understanding the effects of long-term caregiver stress is crucial for everyone involved in caregiving.
When I reflect on my journey, it becomes evident how long-term caregiver stress has shaped my physical and emotional well-being.
Awareness of long-term caregiver stress is crucial for not only the caregiver but also the entire family. Recognizing the signs of long-term caregiver stress can lead to better support systems for caregivers.
The System Under Siege: What the HPA Axis Actually Does
Understanding Long-Term Caregiver Stress
Most people have never heard of the HPA hypothalamic-pituitary-adrenal axis. But if you have been caregiving for years, your HPA axis knows you intimately. It has been working overtime on your behalf for longer than it was ever designed to.
Here is the short version: The pituitary gland sits directly below the hypothalamus at the base of the brain. The two are connected by a narrow stalk of tissue called the infundibulum (or pituitary stalk), which contains specialized blood vessels and nerve fibers that allow them to communicate. The hypothalamus in my brain detects a threat or stressor and signals the pituitary gland. The pituitary signals the adrenal glands. The adrenals release cortisol, the primary stress hormone, which mobilizes your body to respond. Threat resolved, system resets. Cortisol clears. You recover.
Understanding the root causes of long-term caregiver stress can empower caregivers to seek help and manage their stress effectively.
That is the design. It assumes the threat ends. Allostatic Overload
Caregiving, especially spousal caregiving for a cognitive or neurological condition, does not end. The vigilance required at 3am is the same vigilance required at 3pm. The behavioral unpredictability, the grief that doesn’t resolve, the isolation, the administrative weight, the medical appointments, the insurance calls, the identity shift from partner to caregiver; none of it resolves. And so the HPA axis never fully resets.
This is the clinical definition of allostatic overload; the cumulative biological cost of chronic stress that never fully resolves. The body adapts and adapts and adapts, until adaptation itself becomes the damage. Developed by neuroscientist Bruce McEwen, the concept describes what happens when the system designed to protect you runs so long without recovery that it begins to erode the very systems it was built to defend.
What makes long-term caregiving a particular form of allostatic overload is anticipatory vigilance; the nervous system’s learned posture of being perpetually braced for what comes next. It is not anxiety in the clinical sense. It is a neurological adaptation that becomes a permanent state. And critically, it does not clock out at night.
Research indicates that long-term caregiver stress leads to significant physiological changes in the body which can be monitored over time.
Even in sleep, the nervous system does not fully stand down. After eighteen years, my body has learned that the night is not safe territory. One ear is always open. One part of the brain is always monitoring, always listening for the sound that means something has changed. That is not a metaphor. It is a measurable disruption of sleep architecture; a suppression of the deep slow-wave stages where the body does its repair work, where hormones are regulated, where the brain consolidates and recovers. Allostatic overload does not respect bedtime.
This is not a metaphor. It is a measurable physiological state.
Specifically, long-term caregiver stress can lead to increased cortisol levels, affecting overall health.
The data on long-term caregiver stress showcases how crucial it is to address the well-being of caregivers in our society.
Recent research confirms that chronic stress produces a blunted diurnal (daytime activity-nighttime sleep) cortisol rhythm coupled with elevated inflammatory biomarkers; a pattern with significant downstream functional implications. When the cortisol signal remains chronically elevated, the entire downstream hormonal architecture begins to shift.
The Cortisol–Testosterone Connection
The HPA axis, your stress system, and the HPG axis, your reproductive and hormonal system that governs testosterone production, are not parallel systems that operate independently. They are in direct biological competition. Elevated cortisol suppresses the hypothalamic-pituitary-gonadal axis. One stress system literally overrides the other. For men, this means that chronic long-term caregiving can functionally suppress testosterone production; not because of age alone, but because the body is perpetually diverting resources toward stress response. You can be physically fit and still be running on a depleted hormonal baseline.
What My Systematic Review Shows About Caregivers and Cortisol
1.) Caregivers consistently show elevated cortisol levels compared to matched non-caregivers
2.) Long-term exposure is measurable via hair cortisol concentration, capturing cumulative secretion over months
3.) Cortisol elevation persists even during periods of relative calm, suggesting HPA axis recalibration
4.) TBI and dementia caregivers report higher burden, more behavioral symptom management, and greater physiological morbidity than caregivers for other conditions
Looking Back on a Moment I Will Never Forget
My father had come to visit us over the Thanksgiving holiday when we were still living on Long Island. It was the morning he was leaving to go back to Columbus, Ohio, where I grew up. He had seen enough by then to understand the reality of my new life. Sitting at the breakfast table, he looked at me, holding back tears, his upper lip quivering, and said: “Thomas, you have such a long road ahead of you.”
My father was a U.S. Navy boxing champion. He understood what it meant to take punishment and stay on your feet. I looked at him and said: “Dad, it’s OK. I’m just gonna die in the ring.”
He gave me a knowing look and nodded. I walked him out to his car and thanked him for making the trip.
My father wasn’t a hugger.
I train consistently and use my developed 5R coping system. My physical fitness has undoubtedly moderated some of this cascade. Exercise is one of the few verified modulators of HPA axis dysregulation. And so is Rest and Recovery.
The Aging You Cannot See: Telomeres and Cellular Wear
This is where the science gets genuinely unsettling, and where I think every long-term caregiver deserves to be informed.
Telomeres are the protective caps at the ends of your chromosomes. They shorten naturally as you age. But they also shorten in response to chronic oxidative stress and sustained cortisol elevation. Telomere length has become one of the most studied biomarkers of biological aging; meaning not how old your birth certificate says you are, but how old your cells are actually functioning.
Research on Alzheimer’s caregivers compared to matched non-caregivers found measurable differences in telomere length and immune cell populations; physical evidence that the effects of chronic stress can be seen at both the genetic and molecular levels.
“These changes amount to a potentially shortened lifespan. Not as metaphor. As molecular biology.”
A 2025 study focused specifically on family caregivers of individuals with Alzheimer’s and related dementias found that shorter telomeres correlated with perceived stress, poor sleep, systemic inflammation, and cardiometabolic markers, forming a biological chain from psychological burden to cellular aging.
The widely cited statistic that strained spousal caregivers face a 63 percent higher mortality risk compared to non-caregiving spouses is not a number produced by emotional anecdote. It is produced by this kind of physiological accounting.
The Cascade: What Chronic HPA Activation Leads To
When the stress axis runs chronically hot, the downstream effects are systemic. The clinical literature associates long-term HPA dysregulation with the following:
Documented Downstream Effects of Chronic HPA Axis Activation
1.)Suppression of testosterone and sex hormone production (HPG axis interference)
2.) Hippocampal volume reduction, the memory and emotional regulation center of the brain
3.) Neuroinflammation, producing a fatigue that sleep does not resolve
4.) Adrenal reserve depletion
4.)Elevated inflammatory markers: IL-6, CRP, and tumor necrosis factor
5.) Telomere shortening and accelerated immune aging
6.) Increased cardiovascular risk: elevated hematocrit, blood pressure dysregulation
7.)Metabolic disruption: insulin resistance, lipid profile changes
7.) Sleep architecture degradation, compounding cortisol dysregulation
This is not a list of things that might happen to caregivers who don’t take care of themselves.
This is a list of things the literature documents happening to caregivers who are doing everything right; including, apparently, people who train eight to ten hours a week.
Mental fatigue is not laziness. It is neurobiology.
The fatigue I carry is not physical. My legs can still push through a hard interval. My recovery from resistance training is intact. What accumulates differently is the cognitive and emotional load; the sustained vigilance, the chronic low-grade hyperarousal, the grief that doesn’t have a finish line. That is the signature of HPA axis dysregulation.
Not weakness. Biology.
I train consistently and use my developed 5R coping system. My physical fitness has undoubtedly moderated some of this cascade. Exercise is one of the few verified modulators of HPA axis dysregulation. And so is Rest and Recovery.
In conclusion, it is vital to recognize the pervasive impact of long-term caregiver stress and seek solutions. Strategies to alleviate long-term caregiver stress include self-care routines and support networks.
My 5R Framework: A Preview
Over years of trial and calibration, I developed a personal protocol I call the 5R: Rest, Recovery, Rally, Rinse, Repeat. It was not designed in a research lab. It was designed in the lived experience of caregiving while trying to remain physically and mentally functional.
What I have come to understand is that each step of my 5R system maps onto documented mechanisms of HPA axis recovery; not by coincidence, but because lived survival necessity and physiological reality tend to converge when you pay close attention.
I am pursuing a comprehensive hormonal and metabolic panel, scheduled but not yet completed. Not because I feel broken. It is because I am a fitness professional who has been operating under an extraordinary allostatic load for nearly two decades, and it is past time for an honest biological accounting.
In the meantime I will take my summer respites as my children step-in and take their mother for a few weeks each. I am so grateful. I make the best of this smaller world.
Rest, Recovery, Rally, Rinse, Repeat.
Bibliography & Clinical Sources
1. Allostatic Load and Allostatic Overload
McEwen, B.S. & Stellar, E. (1993). Stress and the individual: Mechanisms leading to disease. Archives of Internal Medicine, 153(18), 2093–2101.
McEwen, B.S. (1998). Stress, adaptation, and disease: Allostasis and allostatic load. Annals of the New York Academy of Sciences, 840, 33–44.
The Mighty (2026). What is allostatic load? The science of trauma on the body. Accessible overview of McEwen’s framework.
2. Caregiver Cortisol Elevation and HPA Axis Dysregulation
Stalder, T. et al. (2014). Elevated hair cortisol levels in chronically stressed dementia caregivers. Psychoneuroendocrinology, 47, 26–30. PubMed.
ScienceDirect (2025). Impacts of social determinants of health on cortisol response among informal caregivers in OECD countries: A systematic review. Confirms elevated cortisol in caregivers versus matched non-caregivers and validates hair cortisol concentration as a long-term stress biomarker.
Staufenbiel, S.M. et al. (2013). Hair cortisol, stress exposure, and mental health in humans: A systematic review. Psychoneuroendocrinology, 38(8), 1220–1235.
3. Telomere Shortening and Accelerated Cellular Aging in Caregivers
Damjanovic, A.K. et al. (2007). Accelerated telomere erosion is associated with a declining immune function of caregivers of Alzheimer’s disease patients. Journal of Immunology, 179, 4249–4254. NIH/PMC.
Ohio State University / National Institute on Aging (2007). Chronic stress can steal years from caregivers’ lifetimes. Research summary from the Ohio State–NIA collaboration led by Janice Kiecolt-Glaser and Ronald Glaser.
Lewy Body Dementia Association. Long-term caregiving may shorten life up to eight years. Summary of Ohio State–NIA telomere findings showing four to eight years of potential lifespan reduction in chronic caregivers.
Psychological Science Observer (2014). The long and the short of it. Overview of the stress–telomere relationship and its impact on caregiver immune function.
4. Spousal Caregiver Mortality Risk and Telomere Data
National Institutes of Health / PMC (2022). Telomere shortening and the transition to family caregiving in the REGARDS study. Documents the widely cited 63 percent increase in mortality among spousal caregivers who reported strain compared to non-caregiving spouses.
5. Psychological Stress, Telomeres, and Telomerase
Kiecolt-Glaser, J.K. et al. (2010). Psychological stress, telomeres, and telomerase. Brain, Behavior, and Immunity. NIH/PMC. Core paper linking HPA axis dysregulation to telomere biology.
6. TBI Caregiver Burden and Physiological Morbidity
EurekAlert / Ohio State University (2007). Chronic stress can steal years from caregiver. Press release covering the Ohio State–NIA findings on immune cell aging and telomere shortening in long-term caregivers.
Clinical Note: This article reflects the author’s personal health journey and review of peer-reviewed literature. It is not medical advice. Consult a qualified physician before pursuing hormonal testing or any therapeutic intervention.