Anemia is a problem of not having enough healthy red blood cells or hemoglobin to carry oxygen to the body's tissues. Hemoglobin is a protein found in red cells that carries oxygen from the lungs to all other organs in the body. Having anemia can cause tiredness, weakness and shortness of breath.

There are many forms of anemia. Each has its own cause. Anemia can be short term or long term. It can range from mild to severe. Anemia can be a warning sign of serious illness.

Treatments for anemia might involve taking supplements or having medical procedures. Eating a healthy diet might prevent some forms of anemia.