Vitamins
What Are the Symptoms of Vitamin D Deficiency? Why Is It More Common in Winter?
When vitamin D deficiency is marked, it shows up as bone pain, muscle weakness or muscle aches, and bones that break easily (MedlinePlus, NIH). A mild deficiency may cause no symptoms. Only a test that measures the 25(OH)D level in the blood shows a deficiency. The risk rises in the winter months when there is less sunlight, in people who rarely go outside and in those who cover their bodies.
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