Which Hormone Is High During Stress? Cortisol And More

Cortisol is typically the hormone that remains elevated during stress. The adrenal cortex releases it through the hypothalamic-pituitary-adrenal (HPA) axis, and it can remain raised as long as the stressor continues (Russell and Lightman, 2019). Epinephrine and norepinephrine rise first, within seconds, but fade faster. Cortisol takes over within minutes and can stay high for hours or longer if the stress doesn't stop. Understanding how these hormones work matters because chronically raised cortisol is associated with metabolic syndrome, cardiovascular disease, and suppressed reproductive hormone signaling (Kaur et al., 2025).

Cortisol is a glucocorticoid produced by the zona fasciculata of the adrenal cortex. The HPA axis governs its production: the hypothalamus releases corticotropin-releasing hormone (CRH), the anterior pituitary releases adrenocorticotropic hormone (ACTH), and ACTH triggers cortisol secretion. During acute stress, cortisol levels rise and pulsatility is maintained. During chronic stress, cortisol can remain raised through reduced metabolism and a shift toward arginine vasopressin-dominant hypothalamic drive (Russell and Lightman, 2019).

Which Hormones Are High During Stress?

Stress hormones are signaling molecules that activate when the body perceives a threat. The Endocrine Society classifies cortisol and catecholamines (epinephrine and norepinephrine) as the primary stress hormones. Cortisol is often called "the stress hormone," but that label is incomplete. It also regulates glucose metabolism, immune responses, blood pressure, and the sleep-wake cycle (Kaur et al., 2025).

The same applies to catecholamines. Epinephrine and norepinephrine regulate heart rate, blood pressure, blood sugar, mood, and sleep even outside of stressful situations. No hormone activates only during stress.

Other molecules that can rise with stress include ACTH, CRH, prolactin, and in some settings, ghrelin. None of these replace cortisol as the standard answer to which hormone is high during sustained stress.

How Stress Hormones Affect the Body

The body's stress response runs on two systems that fire in sequence: a fast path and a slow path. Each produces different physiological effects.

The Fast Response: Catecholamines

The fast stress response activates the sympathetic-adreno-medullary (SAM) axis within seconds. The adrenal medulla releases epinephrine and norepinephrine. These act on receptors in organs, muscles, and other tissues to start the fight-or-flight response.

SAM activation increases heart rate, blood flow to skeletal muscles, oxygen consumption, and blood glucose availability. It also sharpens alertness and focused attention. This response is typically brief. Once the threat passes, catecholamine levels drop.

The Slow Response: Cortisol and the HPA Axis

The slow response activates the HPA axis within minutes. The hypothalamus releases CRH, which triggers the anterior pituitary to release ACTH. ACTH then stimulates the adrenal cortex to produce cortisol.

Cortisol production varies widely among healthy adults and fluctuates across the day (Kaur et al., 2025). Secretion follows a circadian rhythm: levels rise in the final hours of sleep, peak near waking, and fall gradually to their lowest point around midnight.

Cortisol performs several functions during a stress response. It raises blood glucose by promoting liver gluconeogenesis. It reduces inflammation in the short term. And it redirects energy away from non-urgent processes like digestion and immune surveillance. These effects help in acute situations, but they become harmful when the HPA axis stays activated over weeks or months.

Symptoms of High Stress Hormones

The fast and slow stress responses produce different symptoms.

High Catecholamine Levels

When the SAM axis fires, epinephrine and norepinephrine cause narrowed blood vessels, increased blood pressure, faster heart rate, higher cardiac output, wider airways, and increased glucose release. They also reduce intestinal motility and can produce short-term pain relief. These effects are temporary and resolve once the immediate stressor is gone.

High Cortisol Levels

Sustained HPA axis activation raises cortisol over time. Certain medical conditions like Cushing syndrome can also cause chronically high cortisol. Symptoms of excess cortisol include weight gain concentrated in the face, abdomen, and upper back; high blood pressure; muscle weakness; and bone loss (osteoporosis). Cortisol excess can also cause high blood sugar that, if prolonged, can progress to type 2 diabetes (Kaur et al., 2025).

A single afternoon cortisol measurement or a consumer cortisol kit doesn't constitute a diagnosis of any condition. Interpretation depends on the test type and the time of day the sample is collected.

What Happens When Stress Becomes Chronic?

Chronic stress can dysregulate the HPA axis. In many individuals, cortisol stays raised, and the body's normal feedback loop (where cortisol signals the hypothalamus and pituitary to slow down) stops working properly.

Prolonged cortisol exposure is associated with cardiovascular disease, impaired memory and concentration, sleep disturbances, suppressed immune function, and increased risk of anxiety and depressed mood (Russell and Lightman, 2019). The CDC notes that chronic stress also drives unhealthy coping habits like excess alcohol use and reduced physical activity, which compound the problem.

Cortisol's effects on the brain are worth attention. In the Framingham Heart Study, adults without dementia (mean age 48.5) in the highest cortisol group had lower total brain volume and worse memory performance than those with mid-range levels (Echouffo-Tcheugui et al., 2018). Chronic cortisol exposure has been associated with hippocampal atrophy and changes in prefrontal function (Kaur et al., 2025).

Can High Cortisol Affect Testosterone?

Chronic HPA activation can suppress the hypothalamic-pituitary-gonadal (HPG) axis. Cortisol inhibits gonadotropin-releasing hormone (GnRH) release from the hypothalamus, which reduces luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secretion. The downstream result can be reduced testosterone production, particularly when cortisol elevation is sustained and significant (Kaur et al., 2025).

This is secondary (hypogonadotropic) physiology. It appears in pathological hypercortisolism like Cushing syndrome. In one longitudinal study of 44 men with ACTH-dependent Cushing syndrome, hypogonadism persisted in roughly half at 6 months and about 1 in 4 at 12 months after surgical treatment (Shekhar et al., 2024). Recovery rates vary by individual. Everyday perceived stress is not the same as disease-level hypercortisolism, and a high cortisol reading alone is not a diagnosis of testosterone deficiency.

The Endocrine Society's 2018 clinical practice guideline calls for two separate early-morning total testosterone measurements confirming low levels, plus symptoms and signs, before considering testosterone replacement therapy (Bhasin et al., 2018). Specific cutoffs vary by assay, and individual clinical judgment applies. Reversible contributors to low testosterone, including obesity, sleep apnea, alcohol use, and chronic stress, should be addressed first. Addressing cortisol alone without a broader hormone evaluation may delay an accurate diagnosis.

How Are Stress Hormones Measured?

A serum cortisol test measures cortisol in the blood. Because cortisol follows a circadian rhythm, the time of collection matters. Morning serum cortisol (drawn between 8-10 AM) is the standard first-line test.

Late-night salivary cortisol and 24-hour urinary free cortisol have specific clinical roles when a provider suspects pathological hypercortisolism. Random afternoon consumer kits are easy to misread because normal afternoon cortisol is lower than morning cortisol. A low reading at 3 PM doesn't mean the same thing as a low reading at 8 AM.

Lab panels that include cortisol alongside other relevant markers (ACTH, DHEA-S, testosterone, SHBG) give a fuller picture than a single isolated measurement. Clinicians typically prepare clients for blood work with fasting instructions and morning scheduling to get the most accurate results.

How to Lower Stress Hormones

If a medical condition like Cushing syndrome is causing high cortisol, that condition requires medical treatment. But when cortisol is raised by chronic psychological or lifestyle stress, addressing the stress itself is the first-line approach.

Sleep is a strong lever. Chronic sleep restriction has been associated with disrupted cortisol rhythms, including elevated evening levels. Resistance training and regular aerobic exercise lower cortisol over time, and the effect generally develops over several weeks of consistent activity.

Structured relaxation techniques like diaphragmatic breathing and meditation have measurable cortisol-lowering effects. Breathing exercises stimulate the parasympathetic nervous system, which directly opposes the SAM axis. Social connection and professional counseling can also reduce chronic stress, and a licensed provider can help build a management plan tailored to the individual.

No supplement or single lifestyle change resolves chronic cortisol elevation on its own. Results come from sustained, repeated habits.

When to Talk to a Provider

Persistent fatigue, unexplained weight gain, muscle weakness, or mood changes that don't resolve with lifestyle adjustments may warrant lab testing. These symptoms can overlap with both cortisol excess and testosterone deficiency, and lab testing combined with a clinical evaluation is needed to determine the cause. Individuals who suspect they may have hormonal imbalances should speak with a licensed clinician who can order the right tests and interpret them in clinical context.

A thorough evaluation matters. A single lab draw doesn't establish a pattern. Providers generally confirm findings with repeated, timed measurements before recommending treatment. Which hormone is high during stress, and whether that elevation is causing symptoms, requires a clinical evaluation and proper testing, not a consumer quiz.

Disclaimer: This blog post is intended for informational purposes only and should not be considered medical advice. Always consult a healthcare professional before making changes to your health routine.

FAQs

Which hormone is high during stress? 

Cortisol is typically the primary hormone that remains elevated during stress. The adrenal cortex releases it through the HPA axis, and levels can remain high as long as the stressor persists. Epinephrine and norepinephrine also rise but return to baseline faster once the immediate threat passes (Russell and Lightman, 2019).

Is cortisol the only stress hormone? 

No. Catecholamines (epinephrine and norepinephrine) handle the first seconds to minutes of the stress response. ACTH and CRH rise upstream of cortisol as part of the HPA axis signaling chain. Cortisol is the hormone clinicians typically reference when discussing sustained stress because it remains raised the longest.

Can chronic stress lower testosterone? 

Sustained high cortisol can suppress GnRH and LH secretion from the hypothalamus and pituitary, which may lower testosterone production. This is secondary hypogonadotropic physiology. The Endocrine Society's 2018 guideline calls for two confirmed early-morning testosterone measurements showing low levels, plus symptoms, before considering a diagnosis of testosterone deficiency (Bhasin et al., 2018). Individual clinical assessment may vary.

What time of day should cortisol be tested? 

Morning, between 8-10 AM, when cortisol is at its circadian peak. Late-night salivary cortisol and 24-hour urinary free cortisol serve different diagnostic purposes. A random afternoon result is difficult to interpret because normal afternoon cortisol is lower than morning cortisol (Kaur et al., 2025).

What are the symptoms of high cortisol? 

Chronically raised cortisol is associated with weight gain in the face and abdomen, high blood pressure, muscle weakness, bone loss, high blood sugar, sleep disturbances, and impaired memory and concentration. These symptoms overlap with other conditions, so blood work is needed to confirm the cause.

How can stress hormones be lowered without medication? 

Consistent sleep of 7-9 hours, regular resistance training and aerobic exercise, structured relaxation techniques like diaphragmatic breathing, and social connection all lower cortisol over time. No single intervention works instantly. The effect comes from sustained, repeated habits over weeks to months.

References

• J Clin Endocrinol Metab. 2018;103(5):1715-1744

• Neurology. 2018;91(21):e1961-e1970

• Adrenal Hormones. Endocrine Society. Updated January 24, 2022

• Physiology, Cortisol. StatPearls. Updated December 1, 2025

• Nat Rev Endocrinol. 2019;15:525-534

• J Clin Endocrinol Metab. 2024;dgae497