High potassium, called hyperkalemia, can become more common with age because kidney function may decline and some medicines or health conditions can affect potassium balance. Mild high potassium may cause no obvious symptoms, while severe hyperkalemia can affect the heart and become an emergency.
Common Causes
Kidney Problems
The kidneys normally remove excess potassium. Reduced kidney function can allow potassium to accumulate in the blood.
Medicines
Some medicines can raise potassium, particularly in people with kidney disease or other risk factors. Do not stop a prescribed medicine without discussing it with the prescriber.
Medical Conditions
Diabetes, adrenal problems, dehydration and certain acute illnesses can contribute to abnormal potassium levels.
Dietary Potassium
Potassium-rich foods are nutritious and are not automatically harmful. People with reduced kidney function may receive individualized dietary guidance depending on their blood tests and treatment plan.
Symptoms of High Potassium
High potassium may cause muscle weakness, fatigue, tingling, nausea or abnormal heart rhythms, but many people have no symptoms. Because symptoms cannot reliably determine the potassium level, blood testing is important when hyperkalemia is suspected.
When Is It an Emergency?
Severe potassium abnormalities can disrupt the heart’s electrical activity. New chest pain, fainting, severe weakness, difficulty breathing or a racing, irregular or unusually slow heartbeat requires urgent medical attention.
How Is It Diagnosed and Treated?
A blood test measures potassium. Clinicians may repeat the test when a result is unexpected because a difficult blood draw can sometimes cause a falsely elevated result. Treatment depends on the level, symptoms, kidney function and cause. It may include adjusting medicines, treating the underlying condition, changing dietary intake temporarily, or urgent therapies for severe cases.
How Can Older Adults Reduce Risk?
- Keep recommended blood tests and medical appointments.
- Review medicines and supplements with a clinician or pharmacist.
- Follow individualized dietary advice if kidney function is reduced.
- Stay appropriately hydrated unless a clinician has advised fluid restriction.
Final Thoughts
High potassium is not something to diagnose from symptoms alone. Older adults with kidney disease or medicines that affect potassium should follow their monitoring plan and seek medical advice when results are abnormal.
Frequently Asked Questions
Is high potassium always caused by eating too many bananas?
No. Kidney function, medicines and medical conditions are often more important contributors.
Can high potassium be dangerous?
Yes. Severe hyperkalemia can affect heart rhythm and requires prompt medical treatment.
