At a glance:
- Excessively high aldosterone levels often cause high blood pressure that responds to treatment and low blood potassium levels.
- The main causes are an adrenal adenoma and bilateral adrenal hyperplasia.
- Hyperaldosteronism affects an estimated 5–10% of patients with high blood pressure and is one of the most common treatable causes of hypertension.
- Diagnosis is based on measuring the aldosterone-to-renin ratio, and treatment involves surgery or medication, depending on the cause.
Aldosterone is a steroid hormone produced in the adrenal cortex that regulates the body’s sodium, potassium and water balance and plays a key role in blood pressure control. Symptoms of abnormal aldosterone levels can range from persistently high blood pressure to muscle weakness and cramps. Recognizing this hormonal disorder early is important, as leaving it untreated can lead to serious cardiovascular complications.
Which symptoms suggest an aldosterone imbalance?
Aldosterone imbalances fall into two main categories: levels that are too high (hyperaldosteronism) and levels that are too low (hypoaldosteronism). Each has different symptoms and requires a separate approach.
Symptoms of hyperaldosteronism (too much aldosterone):
- Persistently high blood pressure that does not respond to standard treatment
- Low blood potassium levels (hypokalemia), causing muscle cramps and muscle weakness
- Chronic fatigue and lack of energy
- Frequent urination, particularly at night (nocturia)
- Headaches
- Numbness or tingling in the hands and feet
Research shows that hyperaldosteronism is one of the most common treatable causes of hypertension, affecting 5–10% of patients with high blood pressure (Rossi et al., 2006). This means that many people whose blood pressure has been treated unsuccessfully for years may actually have an underlying hormonal disorder.
Symptoms of hypoaldosteronism (too little aldosterone):
- Low blood pressure
- Dizziness and feeling faint, especially when standing (orthostatic hypotension)
- Strong cravings for salty foods
- High blood potassium levels (hyperkalemia)
- General fatigue and weakness
These symptoms partly overlap with symptoms of aging (II), so they can often be mistaken for the decline in well-being associated with older age, leaving the hormonal disorder undiagnosed.
What causes an aldosterone imbalance?
Excess aldosterone, or hyperaldosteronism, has primary and secondary forms, each with different causes and treatment approaches.
Primary hyperaldosteronism (Conn’s syndrome) occurs when the adrenal glands produce excessive amounts of aldosterone independently of the body’s normal regulatory mechanisms. The main causes are:
- Bilateral adrenal hyperplasia — the most common cause, accounting for about 60% of cases
- Adrenal adenoma — a benign tumor, accounting for about 35% of cases
- Less commonly: adrenal carcinoma or hereditary familial forms
(Funder et al., 2016)
Secondary hyperaldosteronism occurs when another condition in the body stimulates the adrenal glands to produce too much aldosterone. The main triggers are:
- Narrowing of the blood vessels supplying the kidneys (renovascular hypertension)
- Heart failure
- Liver cirrhosis
- Nephrotic syndrome
Hypoaldosteronism can develop for various reasons:
- Addison’s disease, or primary adrenal insufficiency
- Certain medications (ACE inhibitors, heparin, NSAIDs)
- Congenital adrenal hyperplasia
- Diabetic nephropathy with hyporeninemic hypoaldosteronism
How is an aldosterone imbalance diagnosed?
If an aldosterone imbalance is suspected, diagnosis begins by measuring the aldosterone-to-renin ratio (ARR) using a routine venous blood sample. According to NIH recommendations, ARR is the gold standard for screening for primary hyperaldosteronism in outpatient practice.
A positive screening result is followed by:
- Confirmatory tests — such as a salt loading test or fludrocortisone suppression test
- Imaging — a CT scan of the adrenal glands to identify tumors
- Adrenal vein sampling — the gold standard for determining which adrenal gland is producing too much aldosterone; this is critical before deciding on surgery (Stowasser, 2009)
Regular monitoring of blood potassium levels is also important, as hypokalemia is often the first laboratory clue to a hormonal disorder (Young, 2007).
What are the treatment options, and when should you see a doctor?
Treatment depends directly on the cause of the disorder:
- For an adenoma, surgical removal (laparoscopic adrenalectomy) is the preferred treatment, normalizing blood pressure in 30–60% of those who undergo surgery
- For bilateral hyperplasia, medication is used — primarily mineralocorticoid receptor antagonists such as spironolactone or eplerenone
- For hypoaldosteronism, fludrocortisone is used as hormone replacement therapy
You should consult a doctor immediately if you have either of the following combinations: high blood pressure that does not respond to treatment alongside unexplained muscle cramps and weakness, or dizziness alongside strong salt cravings.
For athletes training intensely as they prepare to step on stage, electrolyte balance is critical because intense training naturally activates the renin-angiotensin-aldosterone system. This means that some symptoms of an aldosterone imbalance can overlap with signs of overtraining, so thorough laboratory testing helps distinguish a hormonal disorder from changes caused by training.
Electrolyte supplements sold, for example, by well-known sports shops may temporarily relieve symptoms of potassium deficiency, but they are no substitute for a medical diagnosis or treatment of the underlying cause.
References
- Funder JW, Carey RM, Mantero F et al. (2016). The Management of Primary Aldosteronism: Case Detection, Diagnosis, and Treatment: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 101(5):1889–1916. PMID: 26934393
- Rossi GP, Bernini G, Caliumi C et al. (2006). A prospective study of the prevalence of primary aldosteronism in 1.125 hypertensive patients. J Am Coll Cardiol. 48(11):2293–2300. PMID: 16949492
- Stowasser M (2009). Update in primary aldosteronism. J Clin Endocrinol Metab. 94(10):3623–3630. PMID: 19318450
- Young WF Jr (2007). Primary aldosteronism: renaissance of a syndrome. Clin Endocrinol (Oxf). 66(5):607–618. PMID: 17402944
Frequently asked questions
What is a normal blood aldosterone level?
Normal blood aldosterone levels are 30–160 pmol/l when lying down and 110–860 pmol/l when standing, but reference ranges depend on the laboratory and testing method. It is important to assess aldosterone alongside renin levels — the ratio between them gives a more accurate picture.
Can an aldosterone imbalance be treated without surgery?
Yes, for bilateral adrenal hyperplasia, medication (spironolactone, eplerenone) is the standard treatment, and surgery is not needed. Surgical removal is the preferred option only in cases involving an adenoma, but even then, medication can keep symptoms under control while you wait for surgery.
Can stress raise aldosterone levels?
Yes, chronic stress activates the renin-angiotensin-aldosterone system and can raise aldosterone levels in the short term. However, stress does not cause the persistent, clinically significant hyperaldosteronism characteristic of Conn’s syndrome — this requires a structural change in the adrenal glands.
Which medications can distort aldosterone test results?
Several medications affect ARR results: ACE inhibitors, ARBs, diuretics (especially spironolactone), beta blockers, and calcium channel blockers. You should therefore always coordinate your test preparation with your treating physician or endocrinologist.
Are aldosterone disorders hereditary?
Most cases of hyperaldosteronism are not hereditary, but a few rare familial forms exist (e.g., glucocorticoid-remediable aldosteronism, also known as FH-I). These should be considered if the condition develops at a young age or affects several family members.
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