Minerals are inorganic substances that are essential for the human body to function properly. They help build strong bones and muscles and maintain bodily functions. The body requires macrominerals like calcium, sodium, and potassium in relatively large amounts as well as microminerals like iron, zinc and iodine in smaller trace amounts. Deficiencies in important minerals like calcium, iron, magnesium and potassium can develop due to poor diet or absorption issues and cause health problems. Mineral deficiencies are typically treated through dietary changes and supplements under a doctor's guidance.