The above link is a must read, especially for any hyperthyroid patient
Because of the competing nature of calcium and magnesium, excessive calcium intake from foods or supplements can lead to a magnesium deficiency. The symptoms
of magnesium deficiency are identical with many of the symptoms
of thyroid disease, especially hyperthyroidism. People of Asian descent who get hyperthyroidism often become completely rigid and may be found lying in the streets this way.