A blood test will show if your levels of potassium are too high (hyperkalaemia) or too low (hypokalaemia).
Kidney disease is the most common cause of hyperkalaemia, though it can also be caused by medications which reduce the amount of potassium removed from the body.
In rare cases potassium levels may be low through poor diet.
Important: Our website provides useful information but is not a substitute for medical advice. You should always seek the advice of your doctor when making decisions about your health.