A high potassium (hyperkalaemia) is a serious and potentially life-threatening condition. Your doctor might discover you have high potassium through blood tests you had to explain or monitor another condition.
If you have unusually high levels of potassium, you may feel weak and tired, feel nauseous and have an abnormal heart rhythm.
Hyperkalaemia has many possible causes. Most commonly, it is caused by kidney disease or taking medicines that decrease the amount of potassium the body removes via the kidneys.
If you have these symptoms and believe your potassium levels might be high, contact your doctor immediately. They can check your potassium levels with a blood test.