Low calcium levels can be caused by Parathyroid gland problems, kidney disease, diabetes, Vitamin D deficiency, medications, or Genetics. The symptoms of low calcium are Muscle spasms and cramps, Twitching muscles, Numbness or tingling in feet and hands, Numbness or tingling around the mouth, Confusion, Fatigue, Mood changes, Dry, rough skin, Coarse hair that breaks easily.
Low Iron can be caused by insufficient iron in the diet, chronic blood loss, pregnancy, and vigorous exercise. The symptoms of iron deficiency are Paleness or yellow "sallow" skin, Unexplained fatigue or lack of energy, Shortness of breath or chest pain, especially with activity, Unexplained generalized weakness, Rapid heartbeat, Pounding or "whooshing" in the ears, and Headache, especially with activity.