Occasionally, seizures may occur. Prolonged hypocalcemia may be caused by a deficiency of the parathyroid hormones. Vitamin D deficiency may also cause tetany. This normalizes the carbon dioxide concentration of the blood. Tetany that is caused by prolonged hypocalcemia may be treated with intravenous injections of calcium salts.
Tetany resulting from vitamin D deficiency disappears when the deficiency is corrected.