Answer:
iron-deficiency anemia
Step-by-step explanation:
Iron deficiency anemia is one of the types of anemia. It is the specific type of case in which the body lacks red blood cells essential for the blood. Red blood cells are an important part of the blood. They are responsible to carry oxygen to the tissues of the body. The deficiency of iron results in the lack of oxygen supply in the body. This results in leaving the body of the individual to get tired easily and the individual starts to fall short of breath. In the above case, Natalie is suffering from iron deficiency which is the reason for her fatigue.