You're Stressed. But What Is That Actually Doing to You?

Most of us know stress doesn't feel good. But most of us don't realize that months or years of unmanaged stress quietly reshapes the body's chemistry — in ways that show up long before we ever feel "burned out."

This isn't about occasional worry. It's about chronic stress — the kind that lingers week after week. The kind tied to a difficult job, a demanding season of life, financial pressure, or simply the relentless pace of modern schedules. In Central Pennsylvania, we see it across all age groups: working parents in Harrisburg, caregivers in Hummelstown, college-adjacent families in Hershey, small business owners in Mechanicsburg.

Understanding what chronic stress actually does inside the body is the first step toward doing something about it. That's what this article is for.

What Is Cortisol?

Cortisol is a hormone produced by the adrenal glands — two small glands that sit on top of your kidneys. It's sometimes called the "stress hormone," though that label undersells it. Cortisol is essential. It regulates blood sugar, manages inflammation, supports immune function, controls blood pressure, and helps the body convert food into energy.

The problem isn't cortisol itself. The problem is what happens when cortisol levels stay elevated for too long.

When you encounter a stressor — a near-miss in traffic, a tough conversation at work, a deadline — your brain's hypothalamus sends a signal down a chain of command called the hypothalamic-pituitary-adrenal (HPA) axis. The hypothalamus releases a hormone that tells the pituitary gland to signal the adrenal glands to pump out cortisol. Your heart rate rises. Blood sugar spikes. Your senses sharpen. Your body is ready to fight or flee.

This is the acute stress response. It's adaptive. It's kept humans alive for thousands of years.

The issue arises when the "all clear" signal never comes. When the stressor is chronic — not a tiger, but a never-ending inbox — your HPA axis stays active. Cortisol keeps flowing. And over time, according to StatPearls/NCBI (National Library of Medicine), that sustained activation becomes maladaptive and detrimental to physiology.

What the Research Says Chronic Stress Does to the Body

Researchers have documented the downstream effects of chronically elevated cortisol across nearly every organ system. Here's what the evidence shows:

Heart and Blood Vessels

Sustained cortisol elevation promotes oxidative stress, endothelial (blood vessel lining) dysfunction, and inflammation — all of which accelerate the buildup of plaque in arteries, a process called atherosclerosis. Stress-related changes in lipid metabolism also contribute to dyslipidemia (imbalanced cholesterol and triglycerides), increasing cardiovascular risk. The NCBI Physiology review (2024) notes that chronic stress induces sustained sympathetic nervous system activation, driving elevated blood pressure, heart rate, and cardiac output over time.

Immune System

Cortisol is naturally anti-inflammatory — but too much of it for too long suppresses immune function by inhibiting the production of pro-inflammatory cytokines and reducing the activity of immune cells. A 2024 review published in PMC/National Library of Medicine found that chronic stress causes an increase in cortisol levels through the HPA axis, ultimately suppressing the immune response. In practical terms: you get sick more often, recover more slowly, and may be more vulnerable to infections circulating in the community.

Brain and Mood

An NIMH-funded study, published in the Proceedings of the National Academy of Sciences, described a cellular mechanism by which brief cortisol surges actually enhance brain cell energy and function — but prolonged elevation does the opposite: it reduces cell functioning through sustained glucocorticoid-mitochondria interactions. The researchers noted this may be at the root of stress-related anxiety, depression, and PTSD.

Gut and Digestion

Stress hormones bind to adrenergic receptors throughout the GI tract, slowing gastric emptying, reducing blood flow to the gut, and impairing the integrity of the intestinal mucosal barrier. This can manifest as bloating, cramping, diarrhea, constipation, or worsening irritable bowel syndrome (IBS). Stress can also shift the gut microbiome — the community of bacteria in your intestines — in ways that perpetuate the problem.

Muscles and Bones

Prolonged elevated cortisol inhibits osteoblasts (cells that build bone) and promotes osteoclasts (cells that break it down), contributing to decreased bone density over time. It can also lead to muscle wasting. And stress-induced muscle tension is a well-known driver of tension headaches, jaw pain, and chronic neck and back discomfort.

Sleep

Cortisol follows a natural daily rhythm — high in the morning to help you wake up, lower at night to let you sleep. Chronic stress disrupts this rhythm. Elevated evening cortisol makes it harder to fall asleep and stay asleep. Poor sleep then raises cortisol further. It's a cycle that can be hard to break without deliberate intervention.

Signs Your Stress May Have Become Chronic

Chronic stress often hides in plain sight. Common signs include:

• Persistent fatigue that isn't explained by physical illness
• Difficulty concentrating or making decisions
• Irritability, mood swings, or a low-grade feeling of dread
• Frequent headaches, jaw tension, or neck and shoulder tightness
• GI symptoms — heartburn, bloating, irregular bowel habits
• Getting sick more often than usual
• Trouble falling or staying asleep despite feeling exhausted
• Changes in appetite or unexplained weight gain, especially around the midsection
• A sense that you're running on empty even after rest

None of these are definitive on their own. But a cluster of them — especially if they've persisted for weeks or months — is worth discussing with your doctor. Many conditions can cause overlapping symptoms, and a proper evaluation can sort out what's stress-driven versus what needs further workup.

What the Research Shows Actually Helps

The good news: there is solid evidence — from randomized controlled trials and systematic reviews — for several strategies that measurably reduce cortisol and its effects. These aren't soft suggestions. They are studied interventions.

Mindfulness and Meditation

A 2022 study cited by the National Center for Complementary and Integrative Health (NCCIH) found that participants who practiced mindfulness had a significant reduction in perceived stress and anxiety, as well as improved balance of key inflammatory mediators. A 2017 review of eight studies of focused-attention meditation found it reduced both blood pressure and cortisol levels. A landmark 2022 randomized clinical trial published in JAMA Psychiatry found mindfulness-based stress reduction (MBSR) was not inferior to the first-line anxiety medication escitalopram — a striking finding for a non-pharmacological approach.

Regular Physical Activity

Exercise is one of the most well-studied interventions for stress physiology. A 2022 review in Psychoneuroendocrinology found that physical activity decreases cortisol levels and improves sleep outcomes in adults. The Mayo Clinic's exercise and stress resources note that regular aerobic activity boosts mood, improves sleep, and reduces the physiological stress response over time. Even moderate activity — a 30-minute walk through Hershey's rail trail, or a consistent routine in Elizabethtown or Camp Hill — meaningfully shifts the body's stress chemistry.

Deep Breathing and Relaxation Techniques

Slow diaphragmatic breathing (breathing from the belly, not the chest) activates the parasympathetic nervous system — the body's "rest and digest" counterpart to the stress response. NCCIH notes that a 2019 review of 3 studies involving 880 participants found preliminary evidence that diaphragmatic breathing exercises reduced cortisol levels and improved self-reported mental health measures. This is a tool you can use anywhere, anytime.

Sleep Prioritization

Because cortisol disrupts sleep and poor sleep raises cortisol, improving sleep hygiene is one of the most impactful things you can do. Consistent sleep and wake times, cool and dark sleeping environments, limiting screens before bed, and avoiding caffeine in the afternoon all support the cortisol rhythm your body is designed to follow.

Social Connection

Research consistently shows that social support buffers the physiological effects of stress. Community, belonging, and trusted relationships — whether through family, faith, or simply a longtime friendship — are not soft extras. They are biological stress regulators.

When to See Your Doctor

Lifestyle strategies are powerful. But chronic stress sometimes requires more than self-management. It's worth scheduling an appointment when:

• Your symptoms have persisted for more than a few weeks despite your best efforts
• You're experiencing symptoms of depression or anxiety that are affecting daily life
• You have underlying health conditions — hypertension, diabetes, autoimmune disease — that stress may be worsening
• You're relying on alcohol, food, or other substances to cope
• Sleep problems are severe or have lasted more than a month
• You feel like you're just not yourself, and you can't pinpoint why

A good family medicine provider can help you sort through what's physical, what's stress-driven, and what might need a referral or additional support. Labs, a thorough history, and an honest conversation go a long way.

How Dr. Joseph Approaches Stress at Three Angels

At Three Angels Family Practice & Wellness Center in Hershey, PA, Dr. Danette J. Joseph, MD takes an integrative approach to stress and its effects on the body. That means looking at the whole picture: physical symptoms, sleep, lifestyle, mental health history, and the lab findings that can reflect chronic physiological strain. Dr. Joseph combines evidence-based conventional medicine with lifestyle and natural medicine strategies — not as opposites, but as partners.

Whether you're in Hershey, Palmyra, Hummelstown, Middletown, Harrisburg, or Mechanicsburg, you don't have to manage chronic stress alone. And you don't have to wait until symptoms become serious before asking for support.

Talk with Dr. Joseph

If you'd like to discuss chronic stress, cortisol, or how stress may be affecting your health with Dr. Danette J. Joseph, MD, our board-certified family medicine physician at Three Angels Family Practice & Wellness Center in Hershey, PA, we're welcoming new patients. We also serve families from Palmyra, Hummelstown, Elizabethtown, Camp Hill, and surrounding communities.

Request an appointment online or call (717) 298-1268.

---

Medical disclaimer: This article is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition or before starting, stopping, or changing any treatment. Reading this article does not create a physician-patient relationship with Dr. Danette J. Joseph or Three Angels Family Practice & Wellness Center.