Does primary aldosteronism cause lower potassium levels in the blood?

Primary aldosteronism (PA) is a condition where the adrenal glands make too much aldosterone, a hormone that controls sodium and potassium balance. Excess aldosterone pushes sodium back into the body and pushes potassium out, so lower blood potassium is a classic feature of PA. The research backs this up: people with PA tend to have lower serum potassium (the amount of potassium in the blood) than people with ordinary high blood pressure, and the gap grows with more severe disease ¹²⁶.

What the research says

A large analysis pooled 74 observational studies with 26,143 participants and compared people who had PA with people who had essential hypertension (high blood pressure without a known hormonal cause). PA was linked to clearly lower serum potassium, with a standardized mean difference of -1.15 (95% CI -1.27 to -1.02). In plain units, that worked out to about 0.49 mmol/L lower potassium on average. The same analysis found higher serum sodium and lower uric acid in PA, while kidney markers like creatinine and eGFR did not differ significantly ¹.

What to ask your doctor

• Could my potassium level be related to a hormonal cause of high blood pressure like primary aldosteronism?
• Should I be tested for primary aldosteronism, and what does that testing involve (aldosterone, renin, and potassium levels)?
• If I have PA, does the one-sided versus both-sided type change how low my potassium might be?
• How will my potassium be monitored over time, and what symptoms of low potassium should I watch for?
• What treatment options exist for PA, and how might they affect my potassium levels?