Bartter Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Bartter Syndrome?
A nephrologist, a kidney doctor, usually treats Bartter syndrome. Children may also see a pediatric nephrologist. That is a kidney doctor for children. A geneticist can help when the cause is in the genes. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is Bartter syndrome?
Bartter syndrome is a group of very similar kidney disorders. The kidneys cannot reabsorb salt the way they should. So the body loses too much salt in the urine. This throws off the balance of potassium, sodium, chloride, and related molecules.
It is a rare condition. It likely affects about 1 per million people worldwide. It seems more common in Costa Rica and Kuwait than elsewhere.
Symptoms
The condition usually shows up in infancy or childhood. Common signs include:
- Losing too much salt in the urine. This leads to dehydration, constipation, and making more urine than normal (polyuria).
- Low potassium in the blood (hypokalemia). This can cause muscle weakness, cramping, and fatigue.
- Growing and gaining weight more slowly than expected (faltering weight).
- Low blood chloride and metabolic alkalosis, an acid balance problem in the blood.
- Too much calcium in the urine (hypercalciuria). This can weaken the bones (osteopenia).
- Low blood pressure.
- Kidney stones.
Rarely, affected children lose hearing because of changes in the inner ear. This is called sensorineural deafness. It happens mainly in type IV.
Causes and who gets it
Bartter syndrome is caused by mutations, or changes, in at least five genes. The proteins from these genes help the kidneys reabsorb salt. When one does not work, salt is lost in the urine. Potassium and calcium follow it out. In some people, the genetic cause is unknown.
It runs in families in an autosomal recessive pattern. A child must inherit a changed gene from both parents. The parents usually have no symptoms.
Two major forms exist. One begins before birth (the antenatal form) and is often life-threatening. The other, the classical form, begins in early childhood and is less severe. Before birth, it can cause polyhydramnios, which is too much fluid around the fetus. That raises the risk of premature birth.
How doctors diagnose it
Doctors often suspect it when a blood test finds a low level of potassium. Lab tests may show high urine potassium, calcium, and chloride. Blood may show high levels of the hormones renin and aldosterone, low chloride, and metabolic alkalosis. Unlike many other kidney diseases, this one does not cause high blood pressure.
The same signs can occur in people who take too many diuretics (water pills) or laxatives. Urine tests check for other causes. An ultrasound of the kidneys may be done. Genetic testing can confirm the diagnosis.
Treatment
Treatment is eating foods rich in potassium or taking potassium supplements. Many people also need salt and magnesium supplements. Medicine that blocks the kidney from getting rid of potassium may be needed. High doses of NSAIDs may also be used. NSAIDs are a type of pain and inflammation medicine.
Infants who have severe growth failure may grow normally with treatment. Over time, some people with the condition develop kidney failure.
When to see a doctor
Contact your doctor if your child has muscle cramps, is not growing well, or urinates often. These signs need a check-up, because low potassium and salt loss can harm the body over time.
Call 911 if you or your child faints, has trouble breathing, is very hard to wake, vomits again and again, or has sudden severe weakness or cannot move. Very low potassium can cause life-threatening paralysis and serious heart rhythm problems that can be fatal.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Such a doctor can follow growth, weight, and lab values over time. They can watch the salt and potassium balance. They can also coordinate visits with a nephrologist and a geneticist.
Common questions
Is Bartter syndrome inherited?
Yes, most cases are inherited in an autosomal recessive pattern. A child must receive a changed gene from each parent. The parents themselves usually have no symptoms.
Can Bartter syndrome be prevented?
No, it is a genetic condition present at birth. It cannot be prevented. In some people, the exact genetic cause is still unknown, so genetic testing may not always find it.
Does Bartter syndrome get better with treatment?
Treatment can correct the salt and potassium balance. Infants with severe growth failure may grow normally with it. But some people develop kidney failure over time. So regular monitoring matters.
Why does it cause hearing loss?
Only rarely does it cause hearing loss. It happens mainly in type IV, one form of the condition. The hearing loss comes from changes in the inner ear. It is called sensorineural deafness.
Sources
- MedlinePlus Genetics - Bartter syndrome
- MedlinePlus - Bartter syndrome: MedlinePlus Medical Encyclopedia
- MedlinePlus - Low blood potassium: MedlinePlus Medical Encyclopedia
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
