Anemia is a lack of hemoglobin in the blood. It can cause fatigue, a fast heart rate, and shortness of breath. It is often caused by a lack of iron in the diet or blood loss. Anemia is typically diagnosed through a blood test called a complete blood count. This test shows the concentration of red blood cells, white blood cells, hematocrit, hemoglobin, and platelets in a patient’s blood. Mono can cause a loss of red blood cells and hemoglobin. This complication is very uncommon, but it can happen. Someone who recovers from mono but has ongoing fatigue or dizziness should see a doctor to ask about getting blood tests done.
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