What is Aldosterone?

Aldosterone is a hormone produced by the outer layer of the adrenal gland.

Its main job is to help the kidneys decide:

This sounds simple, but it is one of the body's most critical balancing systems.

Why Salt Matters So Much

Salt is not just about taste.

Sodium helps maintain:

Children—particularly infants—are much more sensitive to disturbances in salt balance than adults.

Even relatively small shifts can lead to:

How Aldosterone Works

Aldosterone acts mainly on the kidneys.

It tells the kidneys to:

Where sodium goes, water follows.

So aldosterone indirectly helps maintain:

What Happens When Aldosterone is Too Low?

If the body cannot produce enough aldosterone:

This can become extremely dangerous.

Symptoms of Low Aldosterone

Symptoms may include:

In infants, the signs may initially appear nonspecific.

Parents sometimes describe:

"The baby just didn't seem right."

Why Potassium Matters

One of the major consequences of low aldosterone is high potassium levels.

Potassium is essential for:

But excessively high potassium can affect the heart rhythm and become life-threatening.

Salt-Wasting Crises in Infants

One of the most important pediatric conditions involving aldosterone deficiency is:

In the common "salt-wasting" form:

Affected babies may initially appear well after birth, then deteriorate over days to weeks with:

Without treatment, this can rapidly become fatal.

This is why newborn screening programs for CAH are so important in many countries.

Can Older Children Have Aldosterone Problems?

Yes.

Aldosterone abnormalities can occur in:

Older children may present with:

What is Salt Craving?

Some children with aldosterone deficiency develop unusually strong cravings for salty foods.

Parents may notice:

This is sometimes the body's attempt to compensate for ongoing sodium loss.

How is Aldosterone Regulated?

Unlike cortisol, aldosterone is controlled mainly by:

A system called the renin-angiotensin-aldosterone system (RAAS) constantly monitors circulation and fluid balance.

When blood pressure or sodium drops:

The goal is to restore balance quickly.

How Do Doctors Test for Aldosterone Problems?

Investigations may include:

In some cases:

may also be needed.

How Are Aldosterone Deficiencies Treated?

Treatment depends on the cause, but may include:

Young infants may need careful monitoring because their fluid and electrolyte balance can change rapidly.

Why This Hormone Matters So Much in Children

Adults often tolerate dehydration or electrolyte shifts better than children.

Infants and young children do not.

Their bodies:

That is why aldosterone disorders in pediatrics are taken very seriously.

When Should Parents Seek Medical Evaluation?

Consider assessment if a child has:

In infants, persistent poor feeding or lethargy should never be ignored.