Cortisol is a steroid hormone produced by the adrenal glands, and cortisol is the body's primary stress hormone. Cortisol drives the fight-or-flight response, rises under stress, and reinforces substance use through that rise. Cortisol interacts with the brain's reward system and with the hypothalamic-pituitary-adrenal (HPA) axis, which is what makes it a direct contributor to addictive behavior.
Cortisol lets the body respond to stress, including substance-induced stress. Cortisol also regulates metabolism, blood pressure, and immune function.
Cortisol is produced in the adrenal cortex, the outer layer of each adrenal gland, alongside aldosterone. The adrenal medulla at the core of each gland makes adrenaline instead.
Cortisol is released when the body detects a stressor or low circulating cortisol. Stressors are physical, emotional, environmental, or substance-induced. Substances that suppress the HPA axis, opioids among them, lower cortisol instead of raising it.
Cortisol stabilizes during withdrawal management and rehabilitation through medication, sleep repair, graded exercise, and stress-reduction practice such as mindfulness training.
What Is Cortisol?
Cortisol is a steroid hormone released from the zona fasciculata of the adrenal cortex, and it is the dominant glucocorticoid in the human body. Cortisol circulates mostly bound to corticosteroid-binding globulin (CBG) or albumin, and only the unbound fraction enters tissue and acts. Synthesis starts from cholesterol inside the adrenal gland and begins when adrenocorticotropic hormone (ACTH) arrives from the pituitary. The adrenal glands are two small glands, one sitting on top of each kidney.
Cortisol belongs to the glucocorticoid class of steroid hormones, a class named for its glucose-raising action. Glucocorticoids break protein, carbohydrate and fat down into usable fuel, and glucocorticoids suppress inflammation.
What Is Cortisol's role in addiction?
Cortisol acts on the mesolimbic dopamine pathway, the ventral-tegmental-to-nucleus-accumbens circuit that assigns reward value to a substance and drives repeat use. Altered stress regulation modifies the corticostriatal-limbic motivation and learning systems that run on mesolimbic dopamine, glutamate and GABA, per Sinha, R. (2008), "Chronic Stress, Drug Use, and Vulnerability to Addiction," Annals of the New York Academy of Sciences 1141, 105-130. Opioids and alcohol dysregulate cortisol secretion, which produces craving, compulsion, hypertension and immune suppression.
Persistent intake of an addictive substance such as nicotine or alcohol produces stress-like cortisol responses, and progressive use dysregulates the HPA axis, per Lovallo, W. R. (2006), "Cortisol Secretion Patterns in Addiction and Addiction Risk," International Journal of Psychophysiology 59(3), 195-202.
The hypothalamus regulates the HPA axis through metabolic and diurnal signals under ordinary conditions. Acute emotional distress hands that control to the prefrontal cortex and the limbic system, which is what leaves the axis open to motivational signals from a brain altered by alcohol or nicotine.
Initial activation: Acute binge intoxication raises blood cortisol, norepinephrine and sex steroid metabolites, which produces the raised heart rate, heightened alertness and short-lived euphoria of early substance use, per Blaine, Milivojevic, Fox and Sinha (2016), "Alcohol Effects on Stress Pathways: Impact on Craving and Relapse Risk," The Canadian Journal of Psychiatry 61(3), 145-153.
Tolerance and withdrawal: Continued substance use adapts the body to the drug's presence, and that adaptation is tolerance. Tolerance raises the dose a person needs for the same effect. Removing the substance then produces withdrawal, and dysregulated cortisol secretion accompanies the heightened stress and anxiety of that window.
Chronic stress: Chronic alcohol exposure dysregulates the HPA axis, the sympathetic adrenal medullary system and the sex steroid systems together, per Blaine, Milivojevic, Fox and Sinha (2016). Sustained high cortisol from that dysregulation tracks with anxiety, depression, cardiovascular disease and metabolic disorders.
Craving and relapse: Cortisol regulates motivation, reward processing and decision-making, the three functions a relapse trigger exploits. Dysregulated cortisol secretion raises craving and weakens resistance to a trigger, and a stress-driven cortisol rise strengthens a drug's reinforcing effect.
How do The Adrenal Glands Produce Cortisol?
The adrenal glands produce cortisol in the zona fasciculata, the middle of the adrenal cortex's three layers. ACTH from the anterior pituitary drives the conversion by raising LDL receptor density and cholesterol desmolase activity, which is how cholesterol becomes cortisol.
Substance use overstimulates the adrenal glands through a heightened stress response, and overstimulated glands oversecrete cortisol. That surge strengthens the drive to keep using, which is one reason a substance use disorder resists willpower alone.
The HPA Axis: Regulating Cortisol Levels
The hypothalamic-pituitary-adrenal (HPA) axis sets cortisol secretion. The hypothalamus releases corticotropin-releasing hormone (CRH), CRH drives the pituitary to release ACTH, and ACTH drives the adrenal cortex to make cortisol. The axis imposes a circadian rhythm on that output, with cortisol high in the morning and low at night.
Three properties of a stressor set how strongly the PVN CRH neurons in the hypothalamus fire at the HPA axis: intensity, frequency, and whether the stressor is physical or psychological. Acute stress activates the axis within minutes, and negative feedback shuts the response down once the stressor passes. Substance use disorders hold that response open, which sustains high cortisol between doses.
Which Body Systems Does Cortisol Regulate?
Cortisol regulates five systems: metabolism, immune function, the acute stress response, the HPA axis itself, and cardiovascular and glucose control. Every one of those functions runs through the glucocorticoid receptor, which cortisol reaches in almost every nucleated cell. The 5 regulatory functions are:
- Regulating metabolism
- Regulating immune function
- Mediating stress responses by mobilizing energy and ensuring resources are available to meet stress demands
- Modulating the HPA axis, including the hypothalamus, pituitary, and brain structures involved in stress regulation
- Regulating blood pressure, inflammation and blood glucose
Substance use holds the stress response open, which pushes cortisol above its normal range for months at a time. Sustained high cortisol distorts the same metabolic processes it normally regulates, and hypertension, type 2 diabetes and immune dysfunction follow from that distortion.
Metabolic Regulation and Glucose Homeostasis
Cortisol raises blood glucose through gluconeogenesis in the liver, building glucose from non-carbohydrate substrates with enzymes such as phosphoenolpyruvate carboxykinase (PEPCK). Cortisol simultaneously reduces insulin sensitivity in peripheral tissue, which lifts fasting glucose concentrations and alters beta-cell function.
Long-term substance use breaks that regulation. Persistently high cortisol raises hepatic glucose output while blunting the insulin signal at muscle and fat, and sustained insulin resistance is the pathway to type 2 diabetes.
Immune Modulation and Inflammatory Response
Cortisol suppresses inflammation by blocking pro-inflammatory cytokine production and stopping immune cells from accumulating at inflamed tissue. Cortisol also suppresses T-cell proliferation and natural killer cell activity, which damps innate and adaptive immunity together.
Substance use inverts that control. Prolonged glucocorticoid exposure desensitizes the glucocorticoid receptor on immune cells, so the anti-inflammatory brake weakens even while cortisol stays high, and low-grade chronic inflammation persists.
Broad Spectrum Effects: From Nervous to Reproductive Systems
Cortisol reaches nearly every organ system. Cortisol alters mood and cognition through receptors dense in the hippocampus and prefrontal cortex, and prolonged elevation shrinks hippocampal volume. Cortisol raises blood pressure by increasing vascular tone and sensitizing vessels to norepinephrine, and excess cortisol produces hypertension and a faster resting heart rate.
Cortisol suppresses gonadal function at the level of the hypothalamus, and sustained high cortisol disrupts reproductive hormone balance: irregular menstrual cycles in women, reduced testosterone in men. Prolonged exposure also slows gastric emptying and alters gut permeability, which produces heartburn and indigestion.
How Does Cortisol Act Inside a Cell?
Cortisol acts inside a cell by crossing the plasma membrane, binding a cytoplasmic glucocorticoid receptor, and carrying that receptor into the nucleus to change which genes are transcribed. Lipid solubility permits the first step, because a water-soluble hormone cannot cross a membrane and must signal from outside it. Binding then triggers a conformational change in the receptor, which sheds its chaperone proteins, including heat shock proteins, and translocates into the nucleus.
Inside the nucleus the cortisol-receptor complex binds DNA at glucocorticoid response elements and regulates transcription, switching target genes on or off. That two-step route explains cortisol's delay: cortisol acts through gene expression over hours, while adrenaline acts through membrane receptors in seconds.
How Long Does It Take Cortisol Levels To Come Back To Normal After Drug Use?
Cortisol clears from plasma within hours, and the HPA axis regulation that governs cortisol release stays abnormal well into abstinence. Clearance and regulation are separate questions, and only the second one takes time to resolve. Three variables set an individual timeline: the substance used, how long and how heavily it was used, and the person's baseline health.
Cortisol measurement diagnoses two endocrine diseases: Cushing's syndrome above the reference range, Addison's disease below it. Sample collection is timed to the diurnal peak in the early morning, because an untimed cortisol value is uninterpretable.
Salivary Cortisol Testing
Salivary cortisol testing measures the free, unbound fraction of the hormone from a spit sample, and it needs no needle. Late-night salivary sampling reads the nadir of the diurnal rhythm, and a high night-time result indicates Cushing's syndrome.
Three sample types measure cortisol: saliva, blood serum and 24-hour urine. Salivary sampling is the one that tolerates repeat collection across a day, which is what makes it the practical way to read a disrupted diurnal rhythm during early recovery.
Serum Cortisol Measurements
Serum cortisol is drawn in the early morning, when the diurnal peak makes an abnormally low result diagnostic. A morning serum cortisol that comes back inappropriately low indicates primary adrenal insufficiency, which is Addison's disease.
Is Addiction Linked To Increased Cortisol Levels?
Yes. Addiction correlates with elevated cortisol, and cortisol outside its reference range in either direction produces a named endocrine disease. Cortisol above the range is hypercortisolism, clinically Cushing syndrome; cortisol below it is hypocortisolism, clinically Addison's disease. Cushing syndrome presents with rapid weight gain, easy bruising and diabetes, and its peak diagnosis window is ages 25 to 50, with higher prevalence in women.
Addison's disease, or hypocortisolism, presents with 4 symptoms:
- dehydration
- severe fatigue
- nausea
- lightheadedness
Dehydration traces to cortisol's control of sodium and potassium balance; severe fatigue and lightheadedness trace to its control of glucose mobilization and blood pressure. Cortisol dysregulation in a substance use disorder is treatable, and it is diagnosed by measuring the hormone rather than by reading symptoms.
What Is the Role of Cortisol During Detox and Rehabilitation?
Cortisol predicts how long a person stays in treatment. Men who remained in an abstinence-based recovery program fewer than 90 days had significantly higher initial salivary cortisol than men who stayed past 90 days, per Davies, Todd H. and colleagues (2022), Marshall University Joan C. Edwards School of Medicine, published in Alcoholism: Clinical and Experimental Research.
Withdrawal management targets cortisol because the hormone drives two of its hardest features: the physical stress load and the craving that follows it. Stabilizing cortisol also removes a driver of the hypertension, cardiovascular disease, weight gain, immune suppression and mood disorders that swing with the hormone. Valley Spring Recovery Center treats substance use disorders and co-occurring anxiety, depression and PTSD on an outpatient basis and does not provide detoxification, so medically supervised withdrawal happens at a detox facility first.
Abrupt cessation raises cortisol because the HPA axis over-signals while the body adapts to the absence of the substance. Cognitive impairment during alcohol withdrawal tracks cortisol: the people with the most severe impairment carry the highest cortisol levels, and cortisol function therefore shapes both continued alcohol dependence and relapse risk, per Dr. Abi Rose, School of Psychology, University of Liverpool (2010). Cortisol concentrations run highest in the prefrontal cortex and hippocampus, which is where alcohol-related cognitive damage concentrates.
Two approaches regulate cortisol during rehabilitation:
- Medication-assisted treatment (MAT) - Buprenorphine for opioid use disorder and naltrexone for alcohol use disorder lower cortisol indirectly, by removing the withdrawal stress and craving that drive the HPA axis. Valley Spring Recovery Center provides MAT and does not provide methadone.
- Exercise and occupational therapy (OT) - Moderate-intensity exercise lowers resting cortisol and restores the diurnal curve, and occupational therapy builds the concrete skills a person uses to handle stress, pain and loss without returning to a substance.
What Are the Symptoms of Too Much Cortisol?
Excess cortisol produces hypercortisolism, named Cushing's syndrome in its clinical form. Cushing disease is the narrower diagnosis: a benign pituitary tumor oversecretes ACTH, and the adrenal cortex answers with excess cortisol. There are 6 symptom groups of elevated cortisol:
- Sudden weight gain, especially around the face, abdomen, and back
- Increased bruising or purple stretch marks
- Anxiety, depression, mood swings
- General tiredness
- Muscle weakness
- Reproductive changes including irregular menses and reduced libido
Long-term substance use produces hypercortisolism through a stress response that never resets. Untreated Cushing syndrome then causes 8 further complications:
- infections
- blood clots
- depression
- heart attacks
- cognitive challenges
- high blood pressure
- broken bones
- diabetes
How To Deal with Low Cortisol Levels?
Insufficient cortisol production is hypocortisolism, named Addison's disease. Diagnosis rests on low measured cortisol alongside high renin and a diminished cortisol response to ACTH stimulation. Symptoms are extreme fatigue, weight loss, low blood pressure and salt craving, and illness or injury escalates them into an Addisonian crisis, which is a medical emergency.
Opioids suppress the HPA axis at the hypothalamus and the pituitary, which lowers ACTH drive to the adrenal cortex and produces opioid-induced adrenal insufficiency. Low morning serum cortisol is the screening finding. Mineralocorticoid production is spared, which separates opioid-induced adrenal insufficiency from Addison's disease, and diagnosis rests on a timed cortisol measurement because the fatigue and low blood pressure look like withdrawal.
Does a Cortisol Cleanse Remove Cortisol From The Body?
A cortisol cleanse removes no cortisol, because the adrenal cortex stores none to remove, and circulating cortisol clears on its own with a 66-minute plasma half-life through hepatic reduction and urinary excretion, according to Holland-Frei Cancer Medicine.
Every cleanse presupposes two conditions: a toxin that accumulates, and a reservoir that holds it. Cortisol satisfies neither condition. Corticosteroids are not stored in the adrenal cortex, so the rate of steroid synthesis equals the rate of secretion from the adrenal gland, as stated in the "Hormones of the Adrenal Cortex" chapter of Holland-Frei Cancer Medicine. Healthy adults produce 8 to 30 mg of cortisol per day, and each milligram is synthesized from cholesterol when adrenocorticotropic hormone (ACTH) calls for it, according to Kaur, Gandhi and Sharma, "Physiology, Cortisol," StatPearls, National Center for Biotechnology Information, updated December 2025. The wellness market sells the flush as a cortisol cleanse or a cortisol detox. The cortisol in circulation right now was built minutes ago.
Clearance settles the argument numerically. The plasma clearance of cortisol is rapid, with a half-life of 66 minutes at normal hormone levels, rising to 120 minutes under large steroid loads, as stated in the "Pharmacokinetics of Corticosteroids" chapter of Holland-Frei Cancer Medicine on the NCBI Bookshelf. Five successive half-lives at the normal rate span 5.5 hours and leave about 3 percent of any single cortisol surge in the bloodstream. A cortisol surge from the previous morning has already cleared, which leaves no backlog for a protocol to purge.
The liver and the kidney already perform the work a cortisol cleanse advertises. Most serum cortisol is reduced to dihydrocortisol, then to tetrahydrocortisol, which is conjugated to glucuronic acid; approximately 10 percent of cortisol converts to a 17-ketosteroid, which is conjugated to sulfate. More than 90 percent of secreted glucocorticoid is ultimately excreted in urine. Free cortisol excretion in urine stays low, near 100 micrograms per day, because 80 to 90 percent of filtered cortisol is reabsorbed, mostly from the distal tubule of the kidney. Both figures come from the same Holland-Frei chapter. Set 100 micrograms against the 8 to 30 mg produced daily and free urinary cortisol accounts for 0.3 to 1.3 percent of daily output, which measures how completely the liver conjugates cortisol before excretion. The adrenal medulla, by contrast, does hold a reservoir: it stores adrenaline in vesicles for release into the bloodstream, per Khalil, Rosani and Warrington, "Physiology, Catecholamines," StatPearls, National Center for Biotechnology Information, updated December 2024, so adrenaline function, production, and release follow a storage-and-discharge model that cortisol does not.
Two enzymes named 11-beta-hydroxysteroid dehydrogenase set how much active cortisol reaches a given tissue. 11-beta-hydroxysteroid dehydrogenase type 2 converts cortisol to cortisone, an inactive metabolite, and that conversion prevents cortisol from activating mineralocorticoid receptors. 11-beta-hydroxysteroid dehydrogenase type 1 runs the reverse reaction, regenerating cortisol from cortisone in tissues such as epidermal keratinocytes and dermal fibroblasts (Kaur, Gandhi and Sharma, "Physiology, Cortisol," StatPearls). Tissue-level conversion between cortisol and cortisone governs cortisol activity, and no excretion protocol reaches that conversion.
Substance use disorders alter the cortisol signal rather than the clearance route. Long-term alcohol use dysregulates the basal and stress-reactive secretion of cortisol, abstinent people show a deficient cortisol response to stimulation by corticotropin-releasing factor (CRF), and smaller cortisol responses to public-speaking stress predict faster relapse, per Lovallo (2006). Cortisol rises during alcohol withdrawal because the HPA axis over-signals, not because cortisol has collected in tissue. The defect sits in the set-point and the negative-feedback loop that governs release, several steps upstream of clearance, which is the mechanism the wider literature on addiction and the brain describes across 14 neurotransmitters. A protocol aimed at flushing a hormone that halves every 66 minutes reaches none of it. People in early recovery with disrupted cortisol rhythms have working livers and working kidneys; the loss is regulatory, which is why stress symptoms, causes, effects, and treatment sit in the same clinical picture as cortisol. Restoring HPA axis regulation is the measurable target, and maintaining healthy cortisol levels through sleep, movement, nutrition and clinical stress management is what replaces the cleanse.
How to Maintain Healthy Cortisol Levels?
Five lifestyle levers lower cortisol: sleep, exercise, social connection, deliberate stress-reduction practice, and diet. Each lever acts on the HPA axis rather than on cortisol already in circulation, which is why the effect appears over weeks rather than within a session. The 5 strategies are:
- Build social support networks
- Engage in regular physical exercise for a recommended 150-200 minutes per week
- Explore hobbies and activities that bring joy and relaxation
- Ensure adequate sleep
- Practice stress management techniques such as journal writing, practicing positivity, mindfulness-based stress reduction, deep breathing exercises, and maintaining supportive relationships
Diet reaches cortisol through blood glucose stability, because a meal that spikes then crashes blood sugar triggers a cortisol response to restore it. The following 8 foods and supplements steady that curve or blunt the stress response directly:
- Whole grains
- Fruits
- Vegetables
- Legumes
- Green tea
- Foods high in prebiotics and probiotics
- Fish oil
- Ashwagandha
Which Cortisol Symptoms Need Emergency Care?
Five symptoms need emergency care rather than an appointment, because each one signals a cardiac or neurological event rather than a hormone imbalance:
- chest pain
- trouble breathing
- weakness on one side of the body
- severe headaches
- sudden loss of movement, vision, or speech
Sustained high cortisol raises blood pressure and promotes clotting, which is the mechanism connecting these five emergencies to cortisol. Call 911 for any of them.
Non-emergency cortisol symptoms need a laboratory diagnosis, not a self-assessment. Fatigue, weight change and mood disturbance appear in hypercortisolism, hypocortisolism, thyroid disease and withdrawal alike, and only a timed cortisol measurement separates them. Call Valley Spring Recovery Center at (855) 924-5320 to start an outpatient assessment, if substance use is part of the picture.
Does alcohol increase cortisol levels?
Alcohol raises cortisol during intoxication and then delays its return to baseline, and that delayed recovery is largest in people with an active alcohol use disorder rather than in people who drink without one. Acute binge intoxication raises blood cortisol, norepinephrine and sex steroid metabolites, per Blaine, Milivojevic, Fox and Sinha (2016). Cortisol recovery after drinking was slowest in people with active alcohol use disorder, at g = 0.46 against a pooled effect of g = 0.15 across 15 experimental studies and 426 participants, per Weckesser, Pilhatsch, Muehlhan, Endrass and Miller (2025), "A systematic review with meta-analysis on the relation between acute stress, alcohol consumption and cortisol levels in individuals with a personal, familial or no alcohol use disorder," Translational Psychiatry 15, article 423.
Delayed recovery matters more than the height of the spike. A cortisol response that fails to switch off holds the HPA axis under load between drinking episodes, which is the allostatic adaptation Blaine and colleagues describe. That same 2025 review pooled 84 primary studies and 386 effect sizes from 3,919 people, and it found that exposing people to a stressor barely changed how much they drank once publication bias was corrected, at g = 0.02. Alcohol reshapes the cortisol response more reliably than stress reshapes alcohol intake.
What time of day is cortisol highest?
Cortisol peaks within 30 to 45 minutes of waking, when free salivary cortisol rises 50 to 156 percent above its pre-waking level, and cortisol falls to its lowest concentration of the day at night. That morning surge is the cortisol awakening response, measured by Stalder, Oster, Abelson, Huthsteiner, Klucken and Clow (2025), "The Cortisol Awakening Response: Regulation and Functional Significance," Endocrine Reviews 46(1), 43-59. Secretion begins climbing in the final hours of sleep, spikes after waking, then declines in two phases to a nocturnal nadir, per Kaur, Gandhi and Sharma, "Physiology, Cortisol," StatPearls.
Sample timing therefore decides what a cortisol result means. A single untimed draw distinguishes nothing, because one number is unremarkable at 7 AM and pathological at 11 PM. Substance use dysregulates basal cortisol secretion, so a person in early recovery is assessed against the shape of the whole daily curve rather than against one value, and the assessment names a disrupted awakening response rather than a single out-of-range number.