Primary Aldosteronism: A Treatable Hormone Cause of High Blood Pressure

Primary aldosteronism is a common and often overlooked hormonal cause of high blood pressure. It happens when the adrenal glands make too much aldosterone, and targeted treatment can improve blood pressure control and help protect the heart, kidneys, and blood vessels.

Overview

Primary aldosteronism is a disorder in which the adrenal glands produce too much aldosterone. The adrenal glands are small glands located above the kidneys. Aldosterone helps the body balance sodium, potassium, and fluid levels. When too much of this hormone is made, the body retains more sodium and water and loses more potassium, which can raise blood pressure.

This condition is an important cause of secondary hypertension, meaning high blood pressure caused by an underlying medical problem. It is considered treatable, and recognizing it matters because the effects of excess aldosterone go beyond blood pressure alone. Over time, it can place extra strain on the heart, blood vessels, and kidneys.

Primary aldosteronism can happen for different reasons. In some people, one adrenal gland develops a benign, hormone-producing nodule. In others, both adrenal glands are overactive. Identifying which pattern is present helps guide treatment and can make a major difference in long-term blood pressure control.

Symptoms and signs

Many people with primary aldosteronism do not notice clear symptoms at first. Often, the condition is discovered because blood pressure is persistently high, difficult to control, or starts at a younger age than expected. Some people learn about it after routine blood tests show a low potassium level.

When symptoms do occur, they are often related to high blood pressure or low potassium. These may include headaches, tiredness, muscle weakness, muscle cramps, tingling, palpitations, increased thirst, or frequent urination. Severe potassium loss can sometimes cause more pronounced weakness or abnormal heart rhythms, although this is less common.

Typical clues that may lead a doctor to consider primary aldosteronism include:

• High blood pressure that needs several medicines to control
• High blood pressure together with low potassium
• Very high blood pressure or early-onset hypertension
• High blood pressure with an adrenal nodule found on imaging
• A family history of early stroke or difficult-to-treat hypertension

Because symptoms can be subtle, normal daily functioning does not rule the condition out. A person may feel generally well while excess aldosterone is still affecting the cardiovascular system.

Causes and risk factors

The most common causes of primary aldosteronism are a benign aldosterone-producing adenoma in one adrenal gland and bilateral adrenal hyperplasia, in which both glands make too much hormone. Less commonly, inherited forms or rare adrenal tumors can be responsible. These causes differ in how they are treated, which is why careful evaluation is important.

Risk factors are not always obvious, but doctors are more likely to test for the condition in people whose blood pressure is resistant to treatment, in those with unexplained low potassium, and in people with high blood pressure and sleep apnea, an adrenal mass, or a strong family history of early hypertension or stroke. Some patients are first evaluated after repeated difficulty reaching target blood pressure despite good medication adherence.

Primary aldosteronism belongs to a broader group of endocrine disorders that can affect blood pressure and metabolism. Depending on the person’s symptoms and test results, doctors may also consider other hormone-related conditions during assessment, such as hypopituitarism or hypercalcemia, although these are separate disorders with different causes and treatments.

How primary aldosteronism is diagnosed

Diagnosis usually begins with a medical history, physical examination, and blood pressure review. The first laboratory step is commonly a screening blood test that compares aldosterone and renin levels. Renin is a hormone involved in blood pressure regulation. In primary aldosteronism, aldosterone is often inappropriately high while renin is suppressed, creating a suggestive aldosterone-to-renin ratio.

Several factors can affect test interpretation, including blood pressure medicines, sodium intake, potassium levels, kidney function, and the time of day the sample is collected. For this reason, testing should be planned and interpreted by a clinician familiar with the condition. Sometimes medications need to be adjusted before testing, but this should only be done under medical supervision.

If the screening result suggests primary aldosteronism, confirmatory testing may be recommended to show that aldosterone production remains abnormally high despite normal regulatory signals. After that, imaging such as a CT scan of the adrenal glands may help look for nodules or enlargement. In many adults, especially when surgery is being considered, doctors may also use adrenal vein sampling. This specialized test compares hormone production from each adrenal gland and can help determine whether one gland or both glands are involved.

Because blood pressure and metabolic health often overlap, doctors may also evaluate related issues such as diabetes risk, kidney health, and electrolyte balance. In some patients, associated conditions like prediabetes or insulin resistance may also need attention as part of overall cardiovascular risk reduction.

Treatment options

Treatment depends on the cause. If one adrenal gland is producing too much aldosterone and the person is a suitable candidate, treatment may involve removing that adrenal gland. This can improve blood pressure control and may reduce the need for medicines, although some people still need blood pressure treatment afterward because hypertension can have more than one cause.

If both adrenal glands are overactive, or if surgery is not the best option, treatment usually involves medicines that block the effects of aldosterone. These medications help lower blood pressure, reduce potassium loss, and limit harm to the heart and kidneys. Follow-up blood tests are important to monitor potassium and kidney function and to adjust treatment safely.

Doctors may also treat primary aldosteronism as part of a broader hypertension care plan. This can include support through hypertension treatment and targeted endocrine evaluation. When an adrenal source is suspected, further assessment may involve endocrinology care and imaging guidance to clarify the best approach.

Good treatment aims not only to lower blood pressure numbers but also to reduce the longer-term effects of excess aldosterone. This is why identifying and treating the condition early can be especially valuable.

Prevention and self-care

There is no guaranteed way to prevent primary aldosteronism itself, because it is usually caused by changes within the adrenal glands rather than lifestyle alone. However, early detection and steady self-care can help limit complications. People with high blood pressure should attend regular checkups, take medicines as prescribed, and ask their doctor whether additional testing is needed if blood pressure remains hard to control.

General heart-healthy habits still matter. These include reducing excess salt intake, choosing a balanced diet, maintaining a healthy weight, staying physically active, limiting alcohol, avoiding smoking, and getting adequate sleep. These steps may not cure the hormone problem, but they can support better blood pressure control and overall cardiovascular health.

Self-care also means being alert to medication side effects and keeping follow-up appointments for blood tests. Potassium supplements or changes in diet should not be started without medical advice, because the right approach depends on the individual and on the treatment being used. If blood pressure readings at home are part of the care plan, recording them regularly can help doctors judge how well treatment is working.

When to see a doctor

A person should speak with a doctor if they have high blood pressure that is difficult to control, especially if they need several medications or if blood pressure remains elevated despite treatment. Medical review is also important if blood tests show low potassium, if there is unexplained muscle weakness or cramping, or if high blood pressure develops at a young age.

Prompt medical advice is particularly important for symptoms such as chest pain, severe shortness of breath, fainting, or signs of a possible stroke, because these require urgent evaluation. Even without emergency symptoms, persistent high blood pressure deserves proper assessment so the underlying cause is not missed.

Evaluation often involves coordination between primary care, cardiology, nephrology, and endocrine specialists. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat endocrine and blood pressure disorders for international patients, helping tailor care when conditions such as primary aldosteronism are suspected.

Frequently asked questions

Is primary aldosteronism the same as regular high blood pressure?

No. Primary aldosteronism is a specific hormonal cause of high blood pressure. It is a form of secondary hypertension, which means there is an identifiable medical reason behind the elevated blood pressure.

Can primary aldosteronism happen without low potassium?

Yes. Many people with primary aldosteronism have normal potassium levels, especially early in the disease. That is one reason the condition can be missed unless doctors actively test for it in the right clinical situations.

Is primary aldosteronism curable?

Some cases can be effectively treated with surgery, especially when one adrenal gland is the source of excess aldosterone. Other cases are managed long term with medications that block aldosterone, often with very good blood pressure and potassium control.

Who should be tested for primary aldosteronism?

Doctors often consider testing in people with resistant hypertension, very high blood pressure, low potassium, an adrenal nodule, or a strong family history of early hypertension or stroke. Testing may also be appropriate when hypertension appears at a relatively young age.

What tests are used to confirm the diagnosis?

The process usually starts with blood tests for aldosterone and renin. If the screening result is suggestive, a doctor may recommend confirmatory testing, adrenal imaging, and sometimes adrenal vein sampling to determine whether one or both glands are involved.

Will treatment lower the risk to the heart and kidneys?

Treating excess aldosterone can improve blood pressure control and help reduce ongoing strain on the cardiovascular system and kidneys. The exact benefit varies from person to person, but timely diagnosis and proper follow-up are important for long-term protection.

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.