Anemia is caused by blood loss, excessive destruction of red blood cells and insufficient or reduced red blood cell production.
1. Blood loss: mainly divided into acute and chronic blood loss. Acute blood loss is common in post-traumatic hemorrhage, and chronic blood loss is the most common cause of anemia.
2. Excessive destruction of red blood cells: it refers to hemolytic anemia, and intrinsic defects of red blood cells can cause their life span to be shortened. Erythrocyte extrinsic factors are divided into immune-related and non-immune-related, a variety of non-immune factors, such as physical, drug, metabolic and biological toxins and other factors can cause hemolytic anemia.
3. Insufficient or reduced erythropoiesis: Bone marrow failure, ineffective hematopoiesis and abnormal hematopoietic regulatory factors may lead to insufficient or reduced erythropoiesis in the human body, resulting in the symptoms of anemia. It can be seen in acute leukemia, aplastic anemia and so on.
If the patient has symptoms of anemia, it is recommended to go to the hospital in time for examination and actively cooperate with the doctor for treatment.