What caused the Iran hostage crisis? A: The Iran hostage crisis occurred when Mohammed Reza Pahlavi, a domineering Iranian ruler who was recently expelled from his country, was granted access into the United States by President Jimmy Carter to receive cancer treatment.
There are five main categories of mineral deficiency: calcium, iron, magnesium, potassium, and zinc. Calcium is needed for strong bones and teeth. It also supports proper function of your blood vessels, muscles, nerves, and hormones.
Iron deficiency anemia results from low or depleted stores of iron, which is needed to produce red blood cells. 1  Excessive bleeding is the most common cause. 2  People may be weak, short of breath, and pale. 3  Blood tests can detect low levels of iron.  Iron supplements are used to restore iron levels.