High red blood cell distribution width is often indicative of vigorous hematopoiesis and is seen in iron-deficiency anemia and hemorrhagic anemia, which may be caused by gastrointestinal bleeding and iron-deficiency anemia, resulting in danger mainly from primary diseases. Such as gastric bleeding, rapid heartbeat, vision loss and so on. 1. Gastrointestinal bleeding: gastrointestinal bleeding leads to high red blood cell distribution width, and patients may have symptoms such as acid reflux, heartburn, abdominal pain and loss of appetite. If the patient’s condition is serious and not treated timely and effectively, complications such as gastric perforation and pyloric obstruction will occur. 2. Iron deficiency anemia: If the red blood cell distribution width is high due to iron deficiency anemia, it can lead to pale skin, fatigue, dizziness and other symptoms. It can also lead to rapid or irregular heartbeat, and is prone to complications such as heart enlargement. Patients with high erythrocyte distribution width need to combine with other indicators to make a comprehensive judgment. If there is any discomfort, you should go to the hospital in time for examination and treatment after clarifying the cause of the disease.