You may notice a lump in your neck ... That part is called the marrow, and it’s where your red blood cells and white blood cells are made. Your doctor may need to find out if a disease is ...

What Is Iron Deficiency Anemia? Iron deficiency anemia is when your body doesn’t have enough red blood cells. Red blood cells carry oxygen from your lungs to the rest of your body. Every organ ...

Red blood cells carry oxygen from the lungs to every other organ, and blood-forming stem cells must make about 200 billion new red blood cells each day to keep the oxygen flowing. For many years, ...