Cancer

• Cancers, especially blood cancers like leukemia, can cause significant damage to the blood. As a result, both your white blood count and hemoglobin count are lowered.
  
  

Anemia

• Some cases of anemia are caused by a decrease in blood cell production in bone marrow. In these cases, both your hemoglobin and your white blood cell count will be low.
  
  

Chemotherapy

• Chemotherapy treatments, while effective at treating cancer, can also damage blood cells and result in decreased hemoglobin and white blood cell count.
  
  

Autoimmune Diseases

• Autoimmune diseases cause your immune system to attack your own body. Many can also result in damage to the blood, leading to a low hemoglobin and a low white blood cell count.
  
  

Nutritional Deficiencies

• Nutritional deficiencies can also result in a low hemoglobin and low white blood cell count.