Occasional muscle spasms are a sign of deficiency of ____ in a underweight and undernourished person
Occasional muscle spasms in an underweight and undernourished person are a classic sign of magnesium deficiency (hypomagnesemia). Magnesium plays a key role in neuromuscular transmission and muscle contraction - low levels lead to increased neuromuscular excitability, causing spasms, cramps, and tetany.
However, muscle spasms in a malnourished individual can also point to:
- Calcium deficiency (hypocalcemia) - causes tetany, Chvostek's and Trousseau's signs
- Potassium deficiency (hypokalemia) - causes muscle weakness and cramping
- Vitamin D deficiency - indirectly causes hypocalcemia and spasms
- Thiamine (B1) deficiency - can cause neuromuscular symptoms
Most likely answer in context:
In an underweight/undernourished person, the triad of muscle spasms + malnutrition most specifically points to magnesium deficiency, as magnesium is commonly depleted in states of malnutrition, malabsorption, and poor dietary intake. Calcium deficiency is a close second, especially if there is also vitamin D deficiency.
In clinical MCQ settings, if the question emphasizes "occasional spasms" with general undernutrition, the expected answer is typically magnesium. If it emphasizes tetany with a more specific clinical picture, calcium may be intended.
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