Could Your High Blood Pressure Be Caused by Primary Aldosteronism
Primary aldosteronism is high blood pressure driven by excess aldosterone, often with low potassium. Learn symptoms, testing, and care options—no referral.
Primary aldosteronism is a treatable cause of high blood pressure where your adrenal glands make too much of a salt-holding hormone called aldosterone. When aldosterone runs high, your body hangs on to sodium and water and dumps potassium, which can keep your blood pressure stubbornly elevated and leave you feeling “off” in ways you might not connect to hypertension. This matters because primary aldosteronism is more common than most people realize, especially if your blood pressure stays high despite medication, you developed hypertension at a young age, or your potassium has ever been low. The good news is that the right testing can point to targeted treatment, and for some people the fix is surprisingly direct. Below, you’ll learn what it can feel like, who is at higher risk, how screening and confirmatory testing work, and what treatment typically looks like. If you want help interpreting results or planning next steps, PocketMD can walk you through your options, and Vitals Vault labs can support the bloodwork your clinician may use to screen and monitor.
Symptoms and signs to notice
High blood pressure that won’t budge
A common clue is blood pressure that stays high even when you’re taking one or more medications and you’re trying to do the “right things.” You might notice your readings are consistently elevated at home, not just in the clinic. The “so what” is that resistant blood pressure raises long-term heart and stroke risk, and primary aldosteronism is one of the few causes where targeted treatment can make a big difference.
Low potassium symptoms
Some people develop low potassium, which can feel like muscle weakness, cramps, tingling, or unusual fatigue. You can also get constipation or feel like your muscles just do not have their normal power. Not everyone with primary aldosteronism has low potassium, but when it shows up, it is a strong hint that aldosterone may be pushing your kidneys to waste potassium.
Frequent urination and intense thirst
When potassium drops, your kidneys can have trouble concentrating urine, which means you may pee more and feel thirstier than usual. This can be subtle at first, and it is easy to blame on drinking more water or caffeine. If it is new for you and your blood pressure is also hard to control, it is worth mentioning because it can fit the same hormone-driven pattern.
Headaches or “pressure” feelings
High blood pressure itself can cause headaches, especially if your numbers spike or stay very high. You might also feel a vague pressure in your head or notice you are more sensitive to exertion. If you ever have a severe headache with confusion, chest pain, shortness of breath, weakness on one side, or vision changes, treat that as an emergency because those can be signs of a hypertensive crisis or stroke.
Heart rhythm flutters or palpitations
Low potassium can irritate your heart’s electrical system, which can feel like skipped beats, fluttering, or a racing heart. Sometimes it is mild and intermittent, and sometimes it is scary. The reason it matters is that significant potassium abnormalities can trigger dangerous rhythms, so palpitations plus weakness or fainting deserves prompt medical attention.
If you’re preparing to discuss screening, Vitals Vault lab ordering can help you check key markers (like potassium and kidney function) starting from $99 panel with 100+ tests, one visit.
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Causes and risk factors
An adrenal nodule making extra hormone
One common cause is a small growth in one adrenal gland that makes aldosterone on its own. Even when the rest of your body is trying to lower the signal, that nodule keeps producing hormone, which keeps your blood pressure high. This matters because if only one gland is responsible, surgery can sometimes cure or dramatically improve your hypertension.
Both adrenal glands overactive
In many people, both adrenal glands are “turned up,” producing more aldosterone than your body needs. You still get the same salt-and-water retention effect, but the treatment approach is usually medication rather than surgery. Knowing which pattern you have can prevent you from going down the wrong path and helps set realistic expectations.
Family history and genetics
If close relatives had early or difficult-to-control high blood pressure, or strokes at younger ages, your odds of a hormone-driven cause go up. There are rare inherited forms where aldosterone regulation is disrupted. The practical takeaway is that family history is not just trivia here—it can be the reason your clinician chooses to screen you sooner.
Resistant or early-onset hypertension
Primary aldosteronism is more likely when your blood pressure is high before age 40, when you need multiple medications, or when you have high readings despite good adherence. It is also worth considering if you have hypertension plus sleep apnea or an adrenal “incidentaloma” found on imaging for another reason. These patterns are red flags that your blood pressure might not be “essential” and could have a specific driver.
Certain meds can mask or mimic patterns
Some blood pressure medicines change renin and aldosterone levels, which can make screening tests harder to interpret. That does not mean you should stop anything on your own, because abrupt changes can be risky. It means you and your clinician may plan the timing of tests, or temporarily switch to medications that interfere less, so the results actually answer the question.
How doctors diagnose it
Screening with the aldosterone-renin ratio
The usual first step is a blood test that compares aldosterone to renin, a kidney signal that normally rises and falls to balance salt and fluid. In primary aldosteronism, aldosterone tends to be inappropriately high while renin is suppressed, so the ratio stands out. Because medications, posture, time of day, and potassium levels can affect results, your clinician will interpret the ratio in context rather than as a simple pass/fail number.
Checking potassium and kidney function
Potassium is often checked at the same time because low potassium can both support the diagnosis and make symptoms worse. Kidney function tests matter too, since aldosterone affects the kidneys and because treatment choices depend on how well your kidneys are working. If your potassium is low, correcting it can also make confirmatory testing more reliable.
Confirmatory testing to prove hormone excess
If screening suggests primary aldosteronism, your clinician may use a confirmatory test that challenges your body’s salt-and-fluid system to see if aldosterone appropriately shuts off. The details vary by center, but the goal is the same: separate true hormone overproduction from a borderline screening result. This step is important because it prevents mislabeling you with a lifelong diagnosis based on a single imperfect test.
Finding the source: imaging and vein sampling
Once the diagnosis is solid, the next question is whether one adrenal gland is responsible or both are. A CT scan can look for nodules, but imaging alone can be misleading because harmless nodules are common as you age. Many people need a specialized procedure called adrenal vein sampling, where hormone levels are measured from each adrenal vein, because it is the best way to decide whether surgery is likely to help.
Treatment options that work
Mineralocorticoid blocker medications
The most common treatment is a medication that blocks aldosterone’s effect on your kidneys (a mineralocorticoid receptor antagonist). When it works, you often see blood pressure improve and potassium normalize, which can translate into fewer headaches, less “wired” feeling, and fewer medication additions. These drugs can raise potassium and affect kidney function, so your clinician will usually monitor labs after starting or adjusting the dose.
Surgery for one-sided disease
If testing shows one adrenal gland is the culprit, removing that gland can be the most direct fix. Some people come off blood pressure meds entirely, while others still need medication but at lower doses and with better control. The big advantage is that you are treating the source rather than just blocking the hormone’s effects.
Sodium reduction that actually matters here
Cutting back on sodium is helpful for most people with hypertension, but it is especially meaningful when aldosterone is high because your body is primed to retain salt. You do not need perfection, but you do need consistency, since restaurant and packaged foods can quietly undo your progress. When sodium intake drops, your medications often work better and swelling or “puffy” feelings may improve.
Treating sleep apnea and other amplifiers
Sleep apnea can worsen blood pressure control and may interact with hormone-driven hypertension. If you snore loudly, wake up unrefreshed, or have daytime sleepiness, a sleep evaluation can be a practical part of your plan. Addressing these amplifiers does not replace aldosterone-specific treatment, but it can lower the overall pressure load on your heart and vessels.
Monitoring and follow-up labs
Treatment is not a one-and-done decision because your potassium, kidney function, and blood pressure can shift as your body rebalances. Home blood pressure readings help you and your clinician adjust medications based on real life, not a single office number. Lab monitoring is how you stay safe while still being aggressive enough to protect your heart.
Living with primary aldosteronism
Track blood pressure like a detective
Home readings are most useful when they are consistent, which means the same cuff, the same arm, and a quiet two-minute rest before you measure. You will start to see patterns, like morning spikes or stress-related surges, that can guide medication timing and lifestyle changes. Bring a week or two of readings to appointments so decisions are based on trends rather than guesswork.
Know what low potassium feels like for you
If you have had low potassium before, learn your personal early signs, such as leg cramps at night, unusual weakness on stairs, or new palpitations. Catching it early can prevent a spiral where you feel worse and your heart rhythm becomes more irritable. If you develop severe weakness, fainting, or persistent palpitations, do not wait it out—get evaluated promptly.
Make food changes sustainable
A low-sodium approach works best when you build a few default meals you genuinely like, rather than trying to “white-knuckle” it for a week. Reading labels becomes easier over time, and you can focus on the biggest wins, like swapping packaged lunches and salty snacks for simpler options. The payoff is that your blood pressure becomes easier to manage, which can reduce the number of medications you need.
Plan around medication side effects
Aldosterone-blocking medications can cause side effects that are frustrating but often manageable with dose adjustments or switching to a different option. If you notice dizziness when standing, breast tenderness, menstrual changes, or changes in libido, bring it up early so you are not tempted to stop treatment abruptly. The goal is long-term control that you can actually live with.
Prevention and what you can control
You can’t prevent it, but you can catch it
You cannot reliably prevent primary aldosteronism because it often comes from how your adrenal tissue behaves, not from something you did wrong. What you can do is recognize the pattern—especially resistant or early-onset hypertension—and ask about screening. Earlier diagnosis can mean fewer years of uncontrolled blood pressure and less cumulative damage.
Avoid silent sodium creep
Even if you do not add salt at the table, sodium can pile up through sauces, breads, deli meats, and takeout meals. Choosing lower-sodium versions most days keeps your blood pressure from constantly fighting against your treatment. Think of it as removing friction so your medications and lifestyle efforts can actually show results.
Protect your kidneys and blood vessels
Primary aldosteronism can strain your kidneys and stiffen blood vessels over time, which is one reason it carries higher cardiovascular risk than typical hypertension at the same blood pressure number. Staying on top of blood pressure targets, avoiding tobacco, and keeping diabetes and cholesterol well-managed all reduce that strain. These steps do not replace aldosterone-specific care, but they lower your overall risk.
Screen family when the pattern is strong
If you are diagnosed and your family has a history of early strokes or hard-to-control hypertension, it is reasonable to tell close relatives so they can discuss screening with their clinician. This is especially relevant for siblings or children who develop high blood pressure young. Catching a treatable cause early can change someone’s health trajectory.
Frequently Asked Questions
What exactly is primary aldosteronism?
Primary aldosteronism is a condition where your adrenal glands make too much aldosterone, a hormone that tells your kidneys to hold on to salt and water. That extra fluid raises your blood pressure, and it can also push your body to lose potassium. The key point is that it is a specific, treatable cause of hypertension.
Can you have primary aldosteronism with normal potassium?
Yes. Many people with primary aldosteronism have potassium levels in the normal range, especially early on or if they are not on diuretics. That is why normal potassium does not rule it out, and why the aldosterone-to-renin screening test can still be useful when the pattern of blood pressure suggests it.
Who should be screened for primary aldosteronism?
Screening is often considered when your blood pressure is resistant to treatment, when it starts at a younger age, or when you have low potassium without a clear reason. It is also commonly discussed if you have an adrenal nodule found on imaging or a strong family history of early hypertension or stroke. If your situation fits, asking directly about screening is reasonable.
What tests are used to diagnose it?
Diagnosis usually starts with bloodwork for aldosterone and renin to calculate the aldosterone-renin ratio, along with potassium and kidney function tests. If screening is positive, confirmatory testing may be done to prove aldosterone stays high when it should shut off. After that, CT imaging and sometimes adrenal vein sampling help determine whether one gland or both are responsible.
Is primary aldosteronism curable?
It can be, depending on the cause. If one adrenal gland is overproducing hormone, surgery can sometimes cure the condition or greatly reduce the need for blood pressure medication. If both glands are overactive, it is usually managed long-term with aldosterone-blocking medication and monitoring, and many people still achieve excellent control.