What is Anemia? Anemia is a widespread blood condition in which you lack enough healthy red blood cells to carry adequate oxygen to your body's tissues. Because your organs are not getting the oxygen they need to function efficiently, anemia is often characterized by feeling chronically tired, weak, and cold. There are many different forms of anemia, each with its own specific cause. It can be a temporary issue or a long-term chronic condition, and it can range from mild to extremely severe. Blood loss is by far the most common underlying cause. Symptoms Anemia symptoms vary widely depending on the underlying cause and the severity of the condition. If the anemia is mild, you might not notice any symptoms at all initially. As the condition worsens, signs commonly include: Extreme Fatigue: The most universal symptom, caused by oxygen deprivation to the muscles and brain. Profound physical weakness. ...