Hypoaldosteronism is a condition in which the adrenal glands produce too little aldosterone, a hormone that regulates sodium retention, potassium excretion, and blood pressure. The hallmark problem is that potassium builds up in the blood while sodium drops, a combination that can disrupt heart rhythm and leave you chronically fatigued. The condition comes in several distinct forms with different underlying causes, and the most common version is tightly linked to diabetes and kidney disease rather than to any dramatic adrenal failure.
What Aldosterone Actually Does
Aldosterone is produced in the outer layer of the adrenal glands, small organs sitting on top of the kidneys. Its main job is to tell the kidneys to hold onto sodium and water while releasing potassium into the urine. That exchange keeps blood volume stable, blood pressure within range, and potassium at a level that lets your heart beat in a normal rhythm. The body controls aldosterone production through a feedback loop: when blood pressure or sodium levels drop, the kidneys release an enzyme called renin, which triggers a chain of chemical signals ending in aldosterone release. When any link in that chain breaks, aldosterone output falls, and the consequences ripple outward.
The Main Types and Their Causes
Hypoaldosteronism is not a single disease. It is better understood as a family of conditions that share the same end result, too little aldosterone activity, but arrive there by different routes.
Hyporeninemic Hypoaldosteronism
This is by far the most common form, and it overwhelmingly affects people with diabetes. The kidneys fail to produce enough renin, so the entire hormonal cascade never gets started and aldosterone stays low. It tends to show up in people who already have mild to moderate kidney damage from diabetic nephropathy, making the clinical picture complicated because several overlapping problems can push potassium higher at the same time.1PubMed Central. Hyporeninemic hypoaldosteronism and diabetes mellitus: Pathophysiology assumptions, clinical aspects and implications for management In practical terms, if you have long-standing diabetes and your doctor keeps flagging high potassium on routine blood work, hyporeninemic hypoaldosteronism is one of the first things on the differential diagnosis.
Primary Aldosterone Deficiency
In rarer cases, the adrenal glands themselves cannot manufacture aldosterone even though renin is being produced normally. The most well-understood genetic cause is a defect in the CYP11B2 gene, which encodes aldosterone synthase, the enzyme responsible for the final step of aldosterone production. Newborns and young children with this deficiency can present with severe salt-wasting that, if untreated, leads to shock and is potentially life-threatening.2PubMed Central. Congenital aldosterone deficiency and its resistance Primary adrenal insufficiency from other causes, such as autoimmune destruction of the adrenal glands (Addison’s disease), also reduces aldosterone, though in that situation cortisol is usually low as well, which broadens the symptom picture considerably.
Drug-Induced Hypoaldosteronism
A number of widely prescribed medications interfere with aldosterone production or action. ACE inhibitors and angiotensin receptor blockers, cornerstones of blood pressure and heart failure treatment, directly suppress the renin-angiotensin-aldosterone system. Spironolactone, commonly used for heart failure and resistant hypertension, works by blocking aldosterone from binding to its receptors in the kidney, effectively creating a functional aldosterone deficit even when blood levels of the hormone are normal.3The American Journal of Medicine. Drug-induced hyperkalemia: old culprits and new offenders Heparin, certain immunosuppressants like cyclosporine and tacrolimus, and nonsteroidal anti-inflammatory drugs (NSAIDs) can also suppress aldosterone through various mechanisms. Because many of these drugs are used in people who already have kidney disease or diabetes, the risk of dangerous potassium elevation gets compounded.
Pseudohypoaldosteronism
Sometimes aldosterone levels are actually normal or even high, but the kidneys do not respond to the hormone. This is pseudohypoaldosteronism, and it comes in two main varieties. Type 1 involves mutations in the genes encoding the epithelial sodium channel (ENaC) in the kidney’s collecting ducts. When that channel does not work, sodium cannot be reabsorbed and potassium cannot be excreted regardless of how much aldosterone is circulating. Researchers have identified specific mutations in the alpha subunit of ENaC that nearly abolish channel function, producing a severe salt-losing condition.4PubMed. A novel mutation of the epithelial Na+ channel causes type 1 pseudohypoaldosteronism Type 2 pseudohypoaldosteronism, also called Gordon syndrome, takes the opposite approach: mutations in WNK kinase genes cause the kidney to reabsorb too much sodium chloride through a different transporter (NCC), leading to high blood pressure, high potassium, and metabolic acidosis. Animal studies have confirmed that the entire disease phenotype of type 2 pseudohypoaldosteronism depends on overactivation of a specific signaling cascade involving the WNK, OSR1, and SPAK kinases.5PubMed. Phenotypes of pseudohypoaldosteronism type II caused by the WNK4 D561A missense mutation are dependent on the WNK-OSR1/SPAK kinase cascade The distinction matters clinically because the treatment strategy differs sharply: giving a synthetic aldosterone replacement will help true aldosterone deficiency but accomplish nothing in a patient whose kidneys ignore aldosterone entirely.
How the Symptoms Show Up
The symptoms of hypoaldosteronism are driven by what happens when potassium rises and sodium falls. Mild cases may produce nothing more than persistently elevated potassium on lab work, which a doctor catches on routine panels. As potassium climbs higher, you can develop muscle weakness, fatigue, tingling or numbness, and an irregular heartbeat. Severely elevated potassium is a medical emergency because it can cause the heart to beat erratically or stop altogether.
Low sodium contributes its own set of problems: lightheadedness, low blood pressure (especially when standing up), nausea, and in extreme cases confusion or seizures. Many people with hypoaldosteronism also develop a mild metabolic acidosis, meaning the blood becomes slightly too acidic, which can cause faster breathing as the body tries to compensate and a general sense of feeling unwell that is hard to pin down.
In newborns and infants, the presentation tends to be more dramatic and harder to recognize at first. Vomiting, poor feeding, failure to gain weight, and dehydration are the classic early signs. In one case report of a newborn with primary hypoaldosteronism caused by a CYP11B2 mutation, the initial complaints were simply feeding problems and weight loss, with lab work revealing the underlying electrolyte crisis.6Trends in Pediatrics. A Newborn Admitted with Hyponatremia and Hyperkalemia Clinic and Diagnosed with Primary Hypoaldosteronism Because infants cannot describe how they feel, the condition is sometimes only caught when blood tests are drawn for other reasons or when the baby becomes seriously ill.
Getting to a Diagnosis
Diagnosing hypoaldosteronism starts with blood work showing the characteristic pattern: high potassium, low sodium, and often a mild metabolic acidosis with a normal anion gap (what clinicians call type 4 renal tubular acidosis). The next step is measuring aldosterone and renin levels. If both renin and aldosterone are low, the picture points toward hyporeninemic hypoaldosteronism. If renin is high but aldosterone is low, the problem is in the adrenal gland itself. And if both renin and aldosterone are high, the kidneys are likely ignoring the aldosterone signal, suggesting pseudohypoaldosteronism.
Doctors sometimes use a stimulation test with ACTH, the pituitary hormone that triggers adrenal output, to rule out broader adrenal failure. In families where hyporeninemic hypoaldosteronism appeared in infants, ACTH testing showed a healthy aldosterone rise and normal responses of other adrenal hormones, confirming that the adrenal glands were structurally fine and pointing the blame toward deficient renin production.7PubMed. Hyporeninemic hypoaldosteronism in infancy: a familial disease
A practical tool in the workup is checking how the kidneys respond to fludrocortisone, a synthetic mineralocorticoid that mimics aldosterone. Clinicians can calculate a measurement called the transtubular potassium gradient (TTKG) before and after giving fludrocortisone. If the TTKG increases after the drug, the kidneys are capable of responding to aldosterone and the problem is simply that aldosterone levels are too low. If the TTKG does not budge, the kidneys are resistant to aldosterone, confirming pseudohypoaldosteronism.8IntechOpen. Diagnosis of Hypoaldosteronism in Infancy Genetic testing rounds out the picture when a hereditary form is suspected, particularly in infants or children with severe salt-wasting syndromes.
Treatment Approaches
Treatment depends entirely on which form of hypoaldosteronism you have, how severe the potassium elevation is, and what other medical conditions are in play.
Fludrocortisone
For people who genuinely lack aldosterone, the most direct treatment is replacing it. Fludrocortisone is a synthetic mineralocorticoid that mimics aldosterone’s effects in the kidney. It works well in primary aldosterone deficiency and has also been used successfully in hyporeninemic hypoaldosteronism, particularly in patients who do not have heart failure or uncontrolled high blood pressure, since the drug promotes sodium and water retention.9PubMed Central. Renal Tubular Acidosis and Management Strategies: A Narrative Review In acute glomerulonephritis, where hyperkalemia can persist despite aggressive diuretic therapy, fludrocortisone has resolved potassium imbalances when other measures failed.10PubMed. Hyperkalemia in acute glomerulonephritis due to transient hyporeninemic hypoaldosteronism For newborns with CYP11B2 mutations, oral salt supplementation combined with fludrocortisone is typically the first-line approach and can be life-saving when started early.6Trends in Pediatrics. A Newborn Admitted with Hyponatremia and Hyperkalemia Clinic and Diagnosed with Primary Hypoaldosteronism
Diuretics
When fludrocortisone is not a good fit, usually because the patient has high blood pressure or heart failure, diuretics offer an alternative route to lowering potassium. Thiazide-type diuretics like chlorthalidone can treat both hypertension and hyperkalemia simultaneously by increasing sodium delivery to the part of the kidney where potassium is secreted.11American Journal of Kidney Diseases. Renal Tubular Acidoses: Core Curriculum 2025 When kidney function is too impaired for thiazides to work effectively, loop diuretics such as furosemide step in. They drive potassium excretion while also helping manage fluid overload, and can be paired with oral bicarbonate to address the metabolic acidosis that usually accompanies the condition.9PubMed Central. Renal Tubular Acidosis and Management Strategies: A Narrative Review
Dietary Potassium Restriction
Diet modification sounds simple, but it can be surprisingly effective. A gradual, individualized reduction in dietary potassium is recommended for people at risk of chronic hyperkalemia, particularly those with kidney disease.12PubMed Central. Moderate stepwise restriction of potassium intake to reduce risk of hyperkalemia in chronic kidney disease: A literature review In a small case series of patients with aldosterone resistance syndrome, strict potassium restriction to under 2 grams per day normalized potassium levels and corrected the associated acidosis within eight weeks, and patients maintained normal levels at six months of follow-up without needing diuretics.13PubMed. Metabolic Acidosis, Hyperkalemia, and Renal Unresponsiveness to Aldosterone Syndrome: Response to Treatment with Low-Potassium Diet High-potassium foods to watch include bananas, oranges, potatoes, tomatoes, spinach, and many legumes. Working with a dietitian makes the restriction practical and sustainable, because indiscriminate cutting can deprive you of fiber and other nutrients that those foods provide.
Stopping the Offending Drug
When the culprit is a medication, the first question is whether that drug can be discontinued or swapped. This is not always straightforward: an ACE inhibitor might be the best thing for someone’s diabetic kidney disease even as it worsens their potassium, so the clinician has to weigh competing risks. In many cases, adjusting the dose or adding a potassium-lowering strategy (a diuretic, dietary changes, or a potassium binder) lets the patient stay on a medication they need for another reason.
Why Hypoaldosteronism Looks Different in Infants and Children
Aldosterone deficiency in newborns and infants deserves its own discussion because the stakes are higher and the presentation is easy to miss. The neonatal kidney is less mature and more dependent on aldosterone to maintain sodium balance, so even partial deficiency can quickly tip into a salt-wasting crisis with dehydration, dangerous potassium levels, and cardiovascular collapse. Congenital aldosterone synthase deficiency from CYP11B2 mutations is rare but serious: affected babies typically present in the first weeks of life with poor feeding, vomiting, and failure to thrive.2PubMed Central. Congenital aldosterone deficiency and its resistance
A separate and often confusing entity is transient pseudohypoaldosteronism, which shows up in young infants with urinary tract infections. In this scenario, the infection itself causes the kidneys to temporarily resist aldosterone. Three infants in one case series, all between five and six weeks old, presented with poor weight gain, low sodium, and high potassium. Their aldosterone levels were actually high, ruling out a production problem. Once the urinary tract infection and any associated malformation were treated, the pseudohypoaldosteronism resolved on its own.14PubMed Central. A rare cause of salt-wasting in early infancy: Transient pseudohypoaldosteronism The clinical lesson is that an infant with unexplained salt-wasting and hyperkalemia should be checked for urinary tract infection even if there are no obvious urinary symptoms, because treating the infection may be all that is needed.
Distinguishing congenital aldosterone deficiency from pseudohypoaldosteronism type 1 is critical because the treatments diverge. In aldosterone deficiency, fludrocortisone works. In the autosomal recessive form of pseudohypoaldosteronism type 1, where the sodium channels themselves are broken, fludrocortisone is useless and management relies on aggressive sodium supplementation, potassium-lowering measures, and sometimes lifelong dietary adjustments.2PubMed Central. Congenital aldosterone deficiency and its resistance
Transient Forms in Adults
Hypoaldosteronism is not always permanent. In acute glomerulonephritis, an inflammatory kidney disease, patients can develop transient hyporeninemic hypoaldosteronism that causes dangerous potassium elevations during the active illness. In a study of such patients, hyperkalemia persisted despite furosemide-driven diuresis in some cases but resolved with fludrocortisone therapy. As the glomerulonephritis itself cleared, the aldosterone system recovered without further intervention.10PubMed. Hyperkalemia in acute glomerulonephritis due to transient hyporeninemic hypoaldosteronism This transient pattern is worth knowing about because it means not everyone who develops hypoaldosteronism needs lifelong treatment. Identifying the reversible trigger and treating it may be enough.
Pregnancy and the Aldosterone System
Pregnancy dramatically reshapes the renin-angiotensin-aldosterone system. Aldosterone levels normally rise substantially during pregnancy to handle the expanded blood volume and increased sodium demands of both mother and fetus. This physiologic surge makes it harder to diagnose aldosterone-related conditions during pregnancy. For women with pre-existing hypoaldosteronism, the body’s increased demand for aldosterone means medication doses may need adjustment, and close monitoring of electrolytes throughout pregnancy is essential.
On the flip side, the condition more commonly discussed in pregnancy is primary aldosteronism, where too much aldosterone is produced. The diagnosis is challenging because the confirmatory tests used outside pregnancy are contraindicated, and clinicians must rely on the pattern of suppressed renin alongside elevated aldosterone.15PubMed Central. Primary aldosteronism in pregnancy The broader point is that any aldosterone disorder, whether excess or deficiency, becomes harder to pin down during pregnancy because the normal reference ranges shift so dramatically. If you are pregnant and have a known aldosterone-related condition, expect more frequent lab draws and possibly dose changes as the pregnancy progresses.
When Hyperkalemia Becomes an Emergency
Chronic mild hyperkalemia from hypoaldosteronism is managed with the strategies described above. But if potassium spikes acutely, whether from illness, dietary indiscretion, or a new medication interaction, it becomes a situation that requires rapid treatment in a hospital setting. The immediate priorities are protecting the heart with intravenous calcium (which stabilizes the heart’s electrical activity without actually lowering potassium), then shifting potassium into cells with insulin and glucose or inhaled beta-agonists, and finally removing potassium from the body with diuretics, potassium binders, or dialysis if kidney function is too poor for anything else to work quickly enough. Once the emergency is resolved, the focus shifts back to identifying and treating the underlying cause so it does not happen again.
People with known hypoaldosteronism should have a clear plan for when to seek emergency care. Warning signs that potassium may have reached dangerous levels include sudden muscle weakness in the legs, palpitations or a slow irregular pulse, chest tightness, and a feeling of heaviness in the limbs. Any of these warrant an urgent check rather than waiting for a scheduled appointment.