How is normocytic normochromic anemia a threat to someone 's life?

See below. Any type of anemia can have various complications if left untreated but it depends heavily on the type of anemia and its cause. Normocytic normochromic anemia is frequently associated with an underlying chronic disease and it is very important to diagnose this disease in order to know what the complications may be and how to treat them.
If count is too low. Simply speaking, red blood cells carry oxygen to the tissues. When your RBC count is below normal, you have anemia - normocytic normochromic is one type. Anytime the RBC count gets truly low - it becomes life-threatening because not enough oxygen gets to the tissues. How low it takes to become dangerous depends on your age, other medical issues, and other factors.