15184 Hyperkalemia High Blood Potassium
Informed by recognized medical guidance
Overview
High blood potassium, also called hyperkalemia, means the level of potassium in your blood is higher than normal. Potassium is a mineral that helps your muscles, including your heart, work correctly. Too much of it can disturb your heart rhythm and be dangerous.
Key facts
- Many people with mild hyperkalemia have no symptoms at all.
- It is often found during a routine blood test.
- Severe hyperkalemia is a medical emergency that needs immediate care.
It is fairly common, especially among people with kidney disease or who take certain blood pressure medicines.
It can affect anyone, but you are more likely to have it if you have chronic kidney disease, diabetes, heart failure, or if you take medicines that make your body hold onto potassium.
Symptoms
- Chest pain — call your local emergency number immediately.
- Difficulty breathing — call your local emergency number immediately.
- Irregular or very fast heartbeat — call emergency services now.
- Fainting or collapse — call your local emergency number immediately.
- ⚠Sudden muscle weakness
- ⚠Numbness or tingling
- ⚠Nausea or vomiting that will not stop
Common symptoms
- No symptoms at all, especially with mild cases
- Muscle weakness or tiredness
- Tingling or numbness
- Nausea or vomiting
- Heart palpitations (feeling your heart beating strangely)
Symptoms in children
- Children may have the same symptoms as adults, but they may not be able to describe them.
- Look for unusual tiredness, fussiness, or a heartbeat that seems too fast or irregular.
Symptoms in older adults
- Older adults may have confusion, weakness, or an irregular heartbeat.
- Sometimes there are no symptoms, so blood tests are important.
Causes
Main causes
- Kidney disease that makes it hard to remove extra potassium
- Medicines that raise potassium levels, such as some blood pressure pills, painkillers, and water pills
- Eating very large amounts of high-potassium food or taking potassium supplements
- Uncontrolled diabetes
- Dehydration or severe burns
Risk factors
- Chronic kidney disease
- Heart failure
- Diabetes
- Using medicines like ACE inhibitors, ARBs, or potassium-sparing diuretics
- Using salt substitutes that contain potassium
- Older age
When to see a doctor
See a doctor urgently if:
- If you have chest pain, palpitations, weakness, or shortness of breath, seek care the same day.
- If your legs feel suddenly heavy or weak, get medical help right away.
Book a routine appointment if:
- If you have kidney disease or are starting a new medicine that may affect potassium, ask for a blood test.
- If you have diabetes and your blood sugar is often high, ask your doctor about checking your potassium.
Diagnosis
A blood test measures your potassium level. Your doctor may also check your kidney function and heart rhythm.
Tests that may be done
- Blood test to check potassium
- Electrocardiogram (ECG) to check your heart rhythm
- Kidney function tests
- Sometimes a urine test
What to expect at your appointment
The blood test is quick and simple. If your potassium is too high, your doctor may repeat the test or send you to the hospital for treatment.
Treatment
Treatment depends on how high your potassium is and what caused it. Mild cases may be managed with diet changes and adjusting medicines. Severe cases need treatment in a hospital.
Self-care at home
- Limit high-potassium foods if your doctor or dietitian advises.
- Avoid salt substitutes that contain potassium.
- Take your medicines exactly as prescribed.
- Stay well-hydrated unless your doctor tells you otherwise.
Medical treatments
Your doctor may give you medicines that help remove potassium from your body, such as diuretics (water pills). They may also give you medicine that helps your body shift potassium into cells, or protect your heart while levels are lowered. If your potassium is very high or your kidneys are failing, you may need a treatment called dialysis to filter the blood. Your doctor will choose the right approach for you.
Living with this condition
Work with your doctor to find the cause of high potassium and keep your levels in a safe range. You may need regular blood tests.
Lifestyle tips
- Take medicines as prescribed.
- Keep a food diary to track potassium.
- Avoid potassium supplements or salt substitutes.
- Tell all your doctors about your condition.
Diet and exercise
Your doctor or a dietitian can help you plan meals that are low in potassium. Foods like bananas, oranges, potatoes, and tomatoes are high in potassium, but you do not need to cut them out completely unless you are told to. Regular gentle exercise can support your heart, but stop and get help if you feel weak or short of breath.
Mental health and emotional wellbeing
Living with a heart-related condition can be worrying. It is normal to feel anxious or stressed. Talk to your healthcare team, and connect with supportive friends or family. If you feel in crisis, reach out to a local crisis line or mental health service.
Prevention
In many cases, yes. Managing kidney disease and diabetes, reviewing medicines with your doctor, and watching your potassium intake can keep your levels from getting too high.
Complications
If left untreated
- Dangerous abnormal heart rhythms
- Heart attack
- Cardiac arrest (heart suddenly stops)
Long-term outlook
With early detection and treatment, most people recover well. Severe hyperkalemia is a medical emergency, but it is treatable. Once the cause is found, you and your doctor can take steps to protect your health.
Find support
External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.
Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Related conditions
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 31, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.