You can pass every line on a standard physical and still feel your body pulling against you. Your blood pressure creeps up. Energy sinks in the afternoon. You crave salt, or you stand up and the room tilts for a second. The cuff reads in range, so the visit moves on. What that reading cannot show is aldosterone — the hormone that decides how much salt and water you hold and how hard your vessels squeeze — working quietly upstream of the number on the machine.
The number is normal. The regulation is not.
For the executive who runs hard, blood pressure is easy to wave off. One reading looks fine. The next is a little high. You blame the coffee, the meeting, the cuff. So the pattern never gets named.
The trouble is that a single blood pressure reading is an outcome, not a cause. It is the last thing to move. By the time the number is consistently high, the system that sets it has usually been compensating for years. Aldosterone is a large part of that system, and almost no routine physical measures it.
What aldosterone actually does
Aldosterone is a hormone made by the adrenal glands. Its job is simple to state and powerful in effect: it tells the kidneys to hold onto sodium and let go of potassium. Where sodium goes, water follows. More retained sodium means more fluid inside the vessels, and more fluid means more pressure.
Aldosterone does not act alone. It sits at the end of a chain called the renin-angiotensin-aldosterone system, or RAAS. When the kidneys sense low pressure or low sodium, they release renin. Renin starts a cascade that ends in aldosterone. In a system that works, the two move together and then settle — renin up, aldosterone up, both back down. The relationship between them, measured as the aldosterone-to-renin ratio, often tells a clearer story than either number read alone.
When that balance breaks, aldosterone can stay high while renin stays suppressed. The body keeps holding salt and water even when it should stop. Pressure drifts up. Potassium drifts down. And because potassium runs your muscles and nerves, the early signs are quiet and easy to explain away: fatigue, cramps, a heartbeat that feels off, more trips to the bathroom at night.
Why “just cut the salt” often fails
The standard response to a rising blood pressure is to eat less sodium. For some people that helps. For many it does little, because the issue is not how much salt goes in — it is a hormone signal telling the body to hold onto whatever salt is already there. Lower the intake and the system simply holds a larger fraction of it.
That is why blood pressure that will not respond to the obvious changes deserves a closer look at the hormones underneath it. Aldosterone excess is far more common than it was once believed to be, and it is routinely missed for one reason: no one measures the hormone. The signals stay quiet until they are not.
- Blood pressure that stays up despite eating well, training, and sleeping
- Low or low-normal potassium on routine labs
- Salt cravings, or feeling wiped out on a low-sodium diet
- Frequent nighttime urination
- Muscle cramps, twitches, or a heartbeat that occasionally feels irregular
- A family history of high blood pressure that started early
Blood pressure is the readout. Aldosterone is one of the hands on the dial.
How Pro Fit approaches it
The point of measuring aldosterone and renin is not to chase a number. It is to understand which system is actually driving your pressure, so the response fits the cause instead of guessing. That fit is what the Pro Fit Performance Continuum is built to find — a structured way to move from a clear baseline to durable, tracked change. You can see how we think about blood pressure and arterial health in a related piece, and the hormone testing itself lives inside our functional lab testing.
The Pro Fit Performance Continuum
- Reveal — establish the baseline picture of how your system is actually working.
- Replenish — build the base before anything advanced.
- Optimize — targeted, data-driven adjustments.
- Restore — retest, then restore recovery and resilience where the data still lags.
- Longevity — keep the gains durable.
For someone in Birmingham or Vestavia Hills whose blood pressure keeps drifting up despite doing the right things, the missing piece is often a hormone no one thought to check. Naming it is the start of building a body that can carry the life you are building.
Common questions
What is the aldosterone-to-renin ratio?
It is a blood test that compares two hormones that regulate blood pressure and fluid balance. Renin starts the cascade; aldosterone finishes it by telling the kidneys to hold sodium and water. The ratio between them can reveal an aldosterone signal that stays switched on when it should turn off — a pattern a single blood pressure reading cannot show.
Can aldosterone explain high blood pressure that will not come down?
Often, yes. Excess aldosterone is one of the more common and most overlooked drivers of blood pressure that resists diet, exercise, and standard changes, because the hormone tells the body to hold salt and water regardless of intake. It is missed mainly because it is rarely measured.
Do I need a referral to have these hormones tested in Alabama?
Pro Fit works with clients in Vestavia Hills and greater Birmingham to run and interpret functional labs, including the hormones behind blood pressure regulation. A free consult is the starting point to see whether this testing fits your picture.