Anemia, Low red blood cell count

Anemia is a condition characterized by abnormally low levels of healthy red blood cells or hemoglobin. It can be caused by excessive bleeding, decreased red blood cell production, or increased red blood cell destruction.
Poor diet can contribute to vitamin deficiency and iron deficiency anemia, in which fewer red blood cells are produced.
Hereditary disorders and certain diseases can cause increased blood cell destruction.
However, excessive bleeding is the most common cause of anemia, and the speed with which blood loss occurs has a significant effect on the severity of symptoms. Anemia can be mild, moderate, or severe enough to lead to life-threatening complications.