A hormone pattern your body sets in motion long before a blood test confirms it often points to aldosterone running higher than it should. Aldosterone is a steroid hormone made by your adrenal glands that tells your kidneys how much sodium to hold onto and how much potassium to release into urine. When levels stay elevated, blood pressure climbs, potassium drops, and the heart and kidneys absorb damage you cannot sense.
Most cases trace to either an adrenal gland problem (primary hyperaldosteronism) or a trigger elsewhere that keeps the hormone rising (secondary hyperaldosteronism). Everyday factors from licorice to certain diuretics can tip the scale in either direction.
This guide covers the most common triggers behind elevated aldosterone, from adrenal tumors and renin-driven conditions to sneaky culprits like licorice and certain diuretics, so you can spot what your body may be reacting to.
Aldosterone and the RAAS Feedback System Explained Simply
Aldosterone is the final hormone in a chain called the renin-angiotensin-aldosterone system, often shortened to RAAS. Two small adrenal glands sit on top of your kidneys, and a thin outer layer in each gland called the zona glomerulosa produces aldosterone. Once released, the hormone travels through your blood and signals your kidneys to reabsorb sodium and water while flushing potassium. Sodium retention expands blood volume, which raises pressure. Potassium loss can weaken muscles and trigger cramps.
With that much pull, aldosterone needs a careful off-switch, and the RAAS provides one.
How the Renin Signal Starts the Chain
The chain begins in your kidneys, which sense low pressure or low sodium and release a protein called renin. Renin converts a liver-made protein called angiotensinogen into angiotensin I, and an enzyme in your lungs converts that angiotensin I into angiotensin II. Angiotensin II does two jobs at once: it tightens blood vessels to lift pressure, and it signals your adrenal glands to release aldosterone.
Because angiotensin II is the trigger, anything that keeps it elevated keeps aldosterone elevated too.
Why a Healthy Loop Self-Corrects
Rising pressure and rising sodium should signal your kidneys to stop releasing renin, which would lower angiotensin II and lower aldosterone. That feedback is supposed to keep the system in a tight range. When the loop breaks, either because your adrenal glands ignore the signal or because something outside the glands keeps pushing renin upward, aldosterone stays high even when pressure is already too high. That distinction is what separates the two main forms of the disorder.
Tip: Whenever a clinician mentions renin, ask whether your level is high, low, or normal relative to aldosterone. The ratio between the two is what tells the real story.
Primary Hyperaldosteronism and the Adrenal Gland Problem
When the adrenal glands themselves drive the overproduction, renin stays suppressed because the body senses high pressure and tries to shut the loop off. Renin ends up low while aldosterone stays high, and that mismatch is the diagnostic fingerprint doctors look for. Reviews cited by the National Institutes of Health suggest primary hyperaldosteronism accounts for a meaningful share of treatment-resistant hypertension, often in people told for years that their blood pressure is simply essential with no clear cause.
Adrenal Adenoma, the Single-Gland Cause
A usually benign tumor called an aldosterone-producing adenoma is the most common single cause, a condition sometimes called Conn’s syndrome after the physician who first described it. These adenomas are typically under two centimeters and pump out aldosterone regardless of what renin is doing. They appear most often between ages thirty and fifty. Surgical removal of the affected adrenal gland often normalizes blood pressure and potassium within weeks.
Bilateral Adrenal Hyperplasia, the Two-Gland Cause
Sometimes both adrenal glands enlarge and overproduce aldosterone at the same time. This pattern, called bilateral adrenal hyperplasia, accounts for a large share of cases and tends to respond better to medication than to surgery. Because both glands are involved, removing one usually does not fix the problem, and mineralocorticoid receptor antagonists become the long-term anchor.
Familial Forms Tied to Specific Gene Mutations
Rare inherited forms, including those linked to mutations in the KCNJ5 gene, can run in families and tend to surface at younger ages. If a parent or sibling was diagnosed with primary hyperaldosteronism early in life, mention that history at your next appointment. Genetic testing and screening of close relatives sometimes uncover cases that would otherwise stay hidden for years.
Secondary Hyperaldosteronism and the Conditions Driving Renin Up
Secondary hyperaldosteronism starts somewhere else in the body, and your adrenal glands are simply responding to a signal they cannot ignore. In this pattern, renin is high and aldosterone is high together, which is the opposite of what you see in primary disease. The job of the workup is to identify what is keeping renin elevated in the first place.
| Feature | Primary Hyperaldosteronism | Secondary Hyperaldosteronism |
|---|---|---|
| Source of excess | Adrenal gland itself | Outside the adrenal glands |
| Renin level | Low (suppressed) | High (driven upward) |
| Aldosterone level | High | High |
| Common triggers | Adenoma, hyperplasia, genetic mutation | Renal artery stenosis, heart failure, cirrhosis, sleep apnea |
| Typical fix | Surgery or mineralocorticoid blockade | Treat the underlying condition |
Reduced Kidney Blood Flow as a Driver
Anything that lowers blood flow through your kidneys tells those organs to release more renin to lift it, and aldosterone rises in response. Renal artery stenosis, where the artery feeding a kidney narrows, is a classic cause. Chronic kidney disease and congestive heart failure create similar signals because your heart or kidneys are not moving blood efficiently. Clinicians often image the renal arteries with ultrasound or CT before settling on a diagnosis.
Liver Cirrhosis and Fluid-Retaining States
Cirrhosis shifts fluid into the abdomen and lowers effective blood volume, which your kidneys interpret as low pressure. The RAAS fires up to compensate, and aldosterone climbs. Pregnancy, certain forms of nephrotic syndrome, and severe dehydration produce a smaller version of the same effect. Treating the liver disease or restoring volume usually brings the hormone back toward normal over time.
Obstructive Sleep Apnea, Diuretics, and Laxatives
Repeated oxygen drops during obstructive sleep apnea at night nudge the sympathetic nervous system and the RAAS upward with each episode. Long-term use of loop and thiazide diuretics, and chronic laxative use, depletes sodium and volume, which your kidneys read as a reason to keep renin high. Many people on long-term water pills end up with secondary hyperaldosteronism without ever realizing it.
Less Obvious Triggers That Often Go Overlooked
Some drivers do not fit neatly into either the primary or secondary bucket, and they slip past routine workups. They matter because most are modifiable, and fixing them can lower aldosterone without surgery or lifelong medication.
Licorice, Medications, and Sodium Patterns
Real licorice (not the artificially flavored kind) contains glycyrrhizin, a compound that mimics aldosterone at the kidney level and suppresses your body’s own production while producing identical symptoms. Even a few weeks of daily licorice candy or licorice tea can push your blood pressure up and your potassium down.
ACE inhibitors, ARBs, and beta-blockers can distort the aldosterone-to-renin ratio in ways that mislead screening, and NSAIDs such as ibuprofen and naproxen can blunt kidney function enough to nudge renin upward. High dietary sodium does not directly cause hyperaldosteronism, but it amplifies blood pressure effects and masks potassium loss until symptoms get loud.
Warning: Do not stop a prescribed blood pressure medication before talking with your prescribing clinician. Some of these drugs need a careful washout before aldosterone testing, and stopping suddenly can spike your blood pressure.
Stress, Endurance Exercise, and Pregnancy
Intense endurance exercise, severe illness, and pregnancy can all transiently nudge aldosterone upward during acute physiological stress without pointing to a chronic disorder. A single elevated reading does not always mean disease, which is why confirmatory testing matters. Pregnancy in particular can produce aldosterone levels two to four times the non-pregnant baseline as your kidneys adapt to expanded blood volume, and the pattern usually resolves after delivery.
Recognizing the Signs and Getting the Right Tests
The symptoms of elevated aldosterone overlap heavily with ordinary hypertension, which is why the condition stays hidden for years in many people. Spotting the pattern usually starts with blood pressure that will not budge despite two or more medications at sensible doses.
Symptoms Worth Flagging
- Treatment-resistant hypertension: Blood pressure that stays high despite two or more medications is the strongest red flag and should prompt screening.
- Muscle weakness and cramps: Low potassium from aldosterone-driven potassium excretion often shows up as nighttime leg cramps or sudden weakness after exercise.
- Fatigue and headaches: These appear in many cases but are easy to dismiss as stress or sleep issues.
- Frequent urination and tingling: Polyuria and paresthesias reflect potassium loss affecting your muscles and nerves.
- Normal potassium does not rule it out: Hypokalemia appears in many but not all cases, so a normal blood potassium level does not eliminate the possibility.
The Screening and Confirmation Pathway
The standard screening test is the aldosterone-to-renin ratio (ARR), drawn in the morning after you have been seated quietly for a period. A ratio above a lab-specific threshold, usually with low renin and high aldosterone, raises the probability of primary disease. Confirmatory tests such as a saline infusion, oral salt loading, or a captopril challenge verify that the result is not a lab fluke.
After confirmation, a CT or MRI of the adrenal glands looks for an adenoma or hyperplasia, and adrenal vein sampling, where blood is drawn directly from each adrenal vein, sometimes determines whether one gland or both are the source.
With the culprit likely identified, deciding what to do about it becomes the next clinical hurdle.
| Test | What It Checks | What a Concerning Result Looks Like |
|---|---|---|
| Aldosterone-to-renin ratio (ARR) | Initial screen for primary hyperaldosteronism | High aldosterone with suppressed renin |
| Saline infusion or oral salt load | Confirms suppression failure | Aldosterone fails to drop with sodium |
| Captopril challenge | Confirms autonomy from RAAS | Aldosterone stays high after the drug |
| Adrenal CT or MRI | Looks for adenoma or hyperplasia | Unilateral mass or bilateral enlargement |
| Adrenal vein sampling | Pinpoints the overactive gland | One side clearly higher than the other |
Treatment Paths and the Long-Term Stakes of Leaving It Untreated
Treatment depends on whether the cause is primary or secondary, and whether a single gland or both glands are driving the problem. Either way, the goal is the same: bring your aldosterone and blood pressure back into a safe range before silent damage accumulates.
Surgical and Medical Options for Primary Disease
Adrenalectomy, the surgical removal of one adrenal gland, can cure or significantly improve primary hyperaldosteronism caused by a single adenoma. Laparoscopic techniques keep recovery short, and blood pressure often improves within days to weeks. For bilateral disease or people who are not surgical candidates, mineralocorticoid receptor antagonists such as spironolactone or eplerenone block aldosterone’s effect at the kidney and protect your heart at the same time. Both drugs require periodic potassium and kidney function monitoring, especially in older adults.
Addressing the Underlying Trigger in Secondary Disease
In secondary hyperaldosteronism, the path forward usually means treating the upstream condition. Managing obstructive sleep apnea with CPAP, adjusting diuretic regimens under medical supervision, addressing heart failure or cirrhosis, and stenting a narrowed renal artery can each bring aldosterone back toward normal. Lifestyle changes do not replace treatment, but reducing sodium, moderating alcohol, and protecting your sleep hygiene all support whatever the clinical plan looks like.
Why Untreated High Aldosterone Matters Over Years
High aldosterone does more than raise blood pressure. It thickens your heart muscle, scars kidney tissue, stiffens arteries, and raises stroke risk in ways that compound year after year. People with primary hyperaldosteronism face a higher risk of cardiovascular events than people with essential hypertension matched for blood pressure, which is why timely diagnosis carries weight.
Lifelong blood pressure monitoring, periodic potassium checks, and follow-up with an endocrinologist or hypertension specialist improve long-term outcomes and reduce the chance of a missed recurrence.
Quick Takeaways
High aldosterone usually traces to either an adrenal gland problem that ignores your body’s off-switch (primary) or an outside trigger that keeps renin elevated (secondary). Screening hinges on the aldosterone-to-renin ratio, and confirmatory testing plus imaging pin down whether one gland, both glands, or another organ system is to blame. Treatable triggers, including sleep apnea, licorice, and certain medications, often hide in plain sight, and addressing them can lower aldosterone without surgery.
Most importantly, untreated high aldosterone silently damages your heart and kidneys over years, so a timely workup protects more than just your blood pressure reading.
FAQ
What is the most common cause of primary hyperaldosteronism?
A single aldosterone-producing adenoma in one adrenal gland, sometimes called Conn’s syndrome, ranks as the leading single cause of primary hyperaldosteronism. Bilateral adrenal hyperplasia, where both glands enlarge and overproduce aldosterone, accounts for a large share of remaining cases and tends to respond to medication rather than surgery.
Can stress cause high aldosterone?
Acute stress, including intense endurance exercise, illness, and pregnancy, can transiently raise aldosterone. Sustained elevation that persists on repeat testing, especially with low renin, points toward a chronic disorder rather than a stress response.
Is high aldosterone dangerous?
Yes. Over time, elevated aldosterone thickens your heart muscle, stiffens arteries, scars your kidneys, and raises the risk of stroke and heart attack beyond what blood pressure alone would predict, which is why timely diagnosis matters.
How do doctors test for high aldosterone?
Most clinicians start with the aldosterone-to-renin ratio (ARR), a blood test drawn in the morning after you have been seated for a period. A positive screen leads to tests such as saline infusion, oral salt loading, or a captopril challenge, followed by adrenal imaging and sometimes adrenal vein sampling.
What medications can raise aldosterone levels?
Loop and thiazide diuretics can raise it indirectly through volume depletion, and ACE inhibitors, ARBs, beta-blockers, and NSAIDs can distort the aldosterone-to-renin ratio and produce misleading readings. Always tell your clinician about every prescription, over-the-counter drug, and supplement before testing.
Can licorice really raise aldosterone?
Real licorice contains glycyrrhizin, which mimics aldosterone at the kidney and can suppress your body’s own production while causing high blood pressure and low potassium. A few weeks of daily licorice candy or tea is enough to produce a measurable effect in some people.
