severe anemia causes
As a result, you may feel tired or weak. You also may have other symptoms, such as shortness of breath, dizziness, or headaches. Severe or long-lasting anemia can damage your heart, brain, and other organs in your body. Very severe anemia may even cause death. Overview. Blood is made up of many parts, including red blood cells, white blood cells, platelets (PLATE-lets), and plasma (the fluid portion of blood).