Types of Magnesium Deficiency

Magnesium deficiency is grouped by its cause, how low the level is and how long it has lasted.

By cause

• Dietary deficiency: low intake of magnesium-rich foods
• Gastrointestinal loss: diarrhoea, malabsorption, bowel surgery, long-term PPI use
• Renal loss: from diuretics, diabetes, certain cancer drugs, or kidney tubular disorders
• Alcohol-related: a combination of poor intake, vomiting, diarrhoea and urinary loss
• Redistribution: magnesium moves into cells during refeeding or after treatment of diabetic ketoacidosis
• Inherited: rare conditions such as Gitelman syndrome and familial hypomagnesaemia

By severity (blood level)

• Mild: about 0.5 to 0.7 mmol/L (1.2 to 1.7 mg/dL), often no symptoms
• Moderate: about 0.4 to 0.5 mmol/L, with cramps and tremor
• Severe: below about 0.4 mmol/L (1.0 mg/dL), with risk of seizures and heart rhythm problems

Cut-offs vary by laboratory, so use the values your laboratory provides.

By duration

• Acute: develops over days, often in hospital
• Chronic: develops over months from long-term causes

Related terms

• Total body deficiency with normal blood level: magnesium is stored mainly in bone and cells, so the blood level can look normal while stores are low
• Subclinical deficiency: low intake without symptoms, which may carry long-term health risks

Ayurvedic grouping

Ayurveda has no separate category for magnesium deficiency. Related symptoms are described under Vata disorders. This is a traditional framework.

Key point

The cause and severity guide treatment, from diet changes to hospital care.

Before your appointment

Note your symptoms, when they began, and what makes them better or worse. Mention alcohol use, diarrhoea, vomiting, diabetes, kidney disease, bowel conditions and any recent illness. List all medicines, especially diuretics, acid-reducing medicines, antibiotics, supplements and herbal products. Write down your usual diet and any antacids or laxatives you take. Ask about blood tests for magnesium, potassium and calcium, and whether an ECG is needed. Call 112 for seizures, fainting, severe weakness or a very irregular heartbeat.