High Potassium Level: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats High Potassium Level?
A nephrologist, a kidney doctor, often treats a high potassium level. A primary care doctor or an emergency doctor may also treat it. 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 a high potassium level?
A high potassium level means you have more potassium in your blood than normal. The medical name is hyperkalemia. Potassium is a mineral your body needs. It helps your nerves and muscles, including your heart, work the right way. But too much can be dangerous. It can cause serious heart problems.
Symptoms
There are often no symptoms with a high level of potassium. When symptoms do appear, they are usually mild. They may include:
- Nausea or vomiting.
- Palpitations, which are irregular heartbeats.
- A slow, weak, or irregular pulse.
- Muscle weakness, numbness, or tingling.
- Sudden collapse, when the heartbeat gets too slow or stops.
Mild high potassium can come and go. Sudden or severe high potassium is life-threatening and needs immediate medical care.
Causes and who gets it
Your kidneys remove extra potassium through the urine. If your kidneys are not working well, potassium can build up in the blood. This is common in people with kidney disease, especially advanced kidney disease. Other causes include:
- Addison disease, when the adrenal glands do not make enough hormones.
- Burns over large areas of the body.
- Some blood pressure medicines, such as ACE inhibitors and spironolactone.
- Severe bleeding from the stomach or intestines.
- Taking extra potassium, such as salt substitutes or supplements.
- Diabetes or heart disease, which can harm the kidneys.
Your provider may check your potassium often if you have long-term kidney disease. The same is true if you take extra potassium, use salt substitutes, or take medicines for heart disease or high blood pressure.
How doctors diagnose it
Your provider will do a physical exam. You will be asked about your symptoms. A blood test measures your potassium level. In most healthy people, the level is between 3.5 and 5.0. High potassium is usually above 5.0. You may also have a basic metabolic panel, a blood test that checks body chemistry. You may have an ECG, a test of your heart rhythm.
Treatment
You need emergency treatment if your potassium level is very high. You also need it if you have danger signs, such as changes in your ECG. In the hospital, treatment may include:
- Calcium through a vein, to treat the effects on muscles and the heart.
- Glucose and insulin through a vein, to help lower potassium.
- Dialysis, a treatment that cleans the blood, if your kidneys work poorly.
- Medicines that help remove potassium from the intestines.
- Some water pills (diuretics) that make the kidneys pass more potassium.
Longer-term treatment can include medicine or diet changes. Your provider will look for the cause. Potassium binders are medicines that attach to extra potassium in the gut and remove it. Your provider may stop potassium supplements. Other medicines may be changed. Do not stop or start any medicine without first talking to your provider.
Diet changes can help prevent and treat high potassium. Your provider may ask you to limit foods such as avocados, potatoes, tomatoes, bananas, and oranges. Many salt substitutes are high in potassium. Fruits and vegetables are still part of a healthy diet in kidney disease. If the cause is known, such as too much potassium in the diet, the outlook is good once the problem is fixed. In severe cases or when risk factors continue, high potassium will likely come back.
When to see a doctor
Call 911 or go to the emergency room if you have chest pain, trouble breathing, a very fast, pounding, or irregular heartbeat, sudden weakness, or you faint or suddenly collapse. Contact your provider right away if you have nausea or vomiting, or if you take a potassium supplement and have symptoms of high potassium. Complications can include cardiac arrest, when the heart suddenly stops beating, and kidney failure.
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. Either can order blood tests, review your medicines, and refer you to a kidney doctor.
Common questions
Can a high potassium level be dangerous?
Yes. Too much potassium in your blood can cause serious heart problems. Sudden or severe high potassium is life-threatening and needs immediate medical care. It can lead to cardiac arrest, when the heart suddenly stops beating.
Does high potassium always cause symptoms?
No. There are often no symptoms with a high level of potassium. When symptoms do appear, they are usually mild. Regular checkups matter if you are at risk.
Which foods should I limit if my potassium is high?
Your provider may ask you to limit some foods that are high in potassium. Examples are avocados, potatoes, tomatoes, bananas, and oranges. Many salt substitutes are also high in potassium. Ask your provider before you change your diet.
Can medicines cause high potassium?
Yes. Some medicines can raise potassium. Examples are some blood pressure medicines, such as ACE inhibitors and spironolactone. Do not stop or start any medicine without first talking to your provider.
Sources
- MedlinePlus - High potassium level
- National Kidney Foundation - High Potassium (Hyperkalemia): Causes, Symptoms, and Treatment
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.
