Learn about anemia, a blood disorder that affects red blood cells and oxygen delivery. Find out the types, causes, diagnosis and treatment options for this condition. Anemia is a condition that develops when your blood lacks enough healthy red blood cells or hemoglobin. Learn more about anemia symptoms, causes, diagnosis, and treatment. Care guide for Anemia. Includes: possible causes, signs and symptoms, standard treatment options and means of care and support. Anemia is easily curable. For anemia caused by a deficiency of iron, vitamin B12 or folate, taking a diet rich in them can help prevent anemia. For anemia due to other causes, outlook will depend on the cause of anemia and its severity.