Signs of low potassium (hypokalemia) include muscle weakness, cramps, fatigue, and constipation, often accompanied by heart palpitations, numbness, or tingling, with severe cases potentially causing abnormal heart rhythms (arrhythmias) or even paralysis, though mild deficiency might show no symptoms at all.
A small drop in the blood potassium level often does not cause symptoms or causes mild to moderate symptoms, which may include:
How is potassium deficiency treated?
Currently, no home fingerprick collection potassium tests are available. Although potassium is one of the biomarkers offered by the Kitby Vitall kidney function home test,34 it requires a clinic visit (at additional cost) to obtain the blood.
Too little potassium, calcium or magnesium in the diet can cause leg cramps. Medicines often prescribed for high blood pressure can cause increased urination, which may drain the body of these minerals.
For leg cramps, drink fluids with electrolytes like coconut water, milk, or sports drinks (Gatorade, Pedialyte), focusing on potassium and sodium, but plain water is also key for dehydration; consider a small amount of pickle juice for rapid relief if needed, and avoid dehydrating drinks like alcohol and excessive caffeine.
Your recovery time will depend on how low your potassium levels were and how long they were low. It can take several weeks or longer for potassium levels to return to normal. If you get potassium through an IV in the hospital, you may only need treatment for a few days.
High potassium drinks include fruit and vegetable juices (like prune, carrot, orange, tomato), coconut water, milk, and some electrolyte drinks, offering significant amounts of this mineral crucial for hydration and nerve function, with options ranging from sweet (fruit juices) to savory (tomato juice) and refreshing (coconut water).
Whatever you call them, bananas are noted for being a good source of potassium, Spees said. According to the U.S. Department of Agriculture, one medium banana provides 375 milligrams. That's about 11% of the recommended daily potassium for a man and 16% for a woman.
Diagnosis and Tests
A serum potassium test is a type of blood test that measures your potassium levels. A provider may also order an electrocardiogram (EKG). An EKG shows changes in your heart rhythm.
If you have a mild case of hypokalemia, potassium supplements should help treat it. Make sure to continue eating a diet rich in potassium. If your case is more severe, potassium given through your vein should treat it. If left untreated, severe hypokalemia can cause serious heart rhythm problems.
5 Signs of an Electrolyte Imbalance
Potassium may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
If high potassium comes on suddenly and you have very high levels of potassium, you may feel heart palpitations (very fast or pounding heart beats in your chest), shortness of breath, chest pain, nausea, or vomiting. Sudden or severe hyperkalemia is a life-threatening condition. It requires immediate medical care.
The best sources of potassium
Meat, fish, poultry, and eggs are moderate to high sources of potassium. These foods are also good sources of high-quality protein, which you need for normal body functions. Follow the guidelines for protein needed in your diet. Some fruits and vegetables can also add a lot of potassium to your diet.
What foods provide potassium?
Low potassium has many causes. The most common cause is potassium loss in urine due to prescription medicines that increase urination. These types of medicines, also known as water pills or diuretics, typically are prescribed to treat high blood pressure or heart disease.
If eating out, try to avoid potato-based dishes and chips. Choose rice or pasta-based dishes which are lower in potassium. Avoid all dried fruit and foods containing them, such as fruit loaf or fruit cake.
A serum (blood) potassium level below 2.5 mmol/L is a medical emergency because it can lead to cardiac arrest and death. The patient will be treated in the hospital with immediate infusions of potassium through an intravenous (IV) line, along with potential other treatments to stabilize the heart rhythm.
The “rule of 7s” is a basic approach that states that the patient's potassium level plus dialysate potassium concentration should equal approximately 7. This approach is acceptable as long as individual care is taken in patients with a propensity for arrhythmias.
Food Sources of Potassium