Symptoms

Because a low red blood cell count decreases oxygen delivery to every tissue in the body, anemia can cause a variety of signs and symptoms. It can also worsen the symptoms of almost any other underlying medical condition. If anemia is mild, it may not cause any symptoms. If anemia is slowly ongoing (chronic), the body may adapt and compensate for the change; in this case there may not be any symptoms until the anemia becomes more severe.

Symptoms of anemia may include the following:

- fatigue;
- decreased energy;
- weakness;
- shortness of breath;
- lightheadedness;
- palpitations (feeling of the heart racing or beating irregularly); and
- looking pale.

Symptoms of severe anemia may include:

- chest pain, angina, or heart attack;
- dizziness;
- fainting or passing out; and
- rapid heart rate.