Potassium deficiency (Hypokalaemia)
Linked to Potassium
Low potassium disturbs muscle and heart function.
Where it shows on the body
Rotate the figure and click a red marker to see the affected area. Internal organs open a 3D organ model.
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Causes
- Fluid loss (vomiting, diarrhoea)
- Diuretics
- Low intake
- Kidney issues
Symptoms
- Muscle weakness and cramps
- Fatigue
- Constipation
- Irregular heartbeat
- Tingling
What happens if untreated
- Dangerous heart rhythm disturbances
- Muscle breakdown in severe cases
Who is most at risk
- People on diuretics
- Those with prolonged vomiting or diarrhoea
Prevention & sources
- Fruit, vegetables and legumes
- Treat underlying causes
Correcting it: foods, amounts & timing
Foods that help & safe amounts
- Bananas, potatoes, beans, and leafy greens
- Around 3500 mg/day from food; only take potassium supplements if prescribed (excess is dangerous)
Time to see benefits
Muscle symptoms often improve within days once levels are corrected.
Sources & references
Symptoms overlap — testing matters
Most deficiency symptoms (fatigue, poor concentration, skin and hair changes) are shared across several nutrients and many unrelated conditions. A symptom on this page is a reason to investigate, not a diagnosis.
A GP can confirm or rule out a deficiency with a blood test and check for underlying causes such as absorption problems. Do not start high-dose supplements on suspicion alone — some nutrients are harmful in excess, and supplementing before testing can mask the underlying result.
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