Low red blood cell count refers to a lower than normal number of red blood cells in the peripheral blood. After the number of red blood cells decreases, the body’s hemoglobin concentration will drop, and symptoms of anemia will appear, including pallor, dizziness and weakness, and panic and chest tightness after activity. There are three causes of red blood cell reduction: 1. Red blood cell production is reduced by a variety of clinical diseases, aplastic anemia, pure red blood cell aplastic anemia, and myelodysplastic syndrome, as well as anemia caused by the lack of hematopoietic materials, such as iron deficiency anemia, megaloblastic anemia, etc.; 2. Red blood cell reduction can also be caused by excessive red blood cell destruction, most commonly by various hemolytic diseases, such as auto The most common is various hemolytic diseases, such as autoimmune hemolytic anemia, thalassemia, etc.; 3. Red blood cell reduction is most commonly caused by the loss of red blood cells, which is common in various chronic blood loss cases, such as chronic peptic ulcer bleeding, and chronic gastrointestinal bleeding caused by hereditary capillary dilatation, etc.