Anemia has the potential for serious consequences. The serious consequences of anemia include decreased immune function, decreased physical strength, changes in the cardiovascular system, changes in the digestive system, and changes in the nervous system. 1. Decrease in immune function: Anemia leads to decreased cellular immunity and leukocyte phagocytosis, and decreased immune function. Therefore, patients with iron deficiency anemia of moderate or higher degree generally have lower resistance to infectious diseases. 2. Decrease in physical strength: Iron deficiency anemia, such as iron deficiency anemia, makes the respiratory enzymes, mitochondrial oxidase and myoglobin concentration in skeletal muscle decrease, resulting in insufficient supply of oxygen to the muscle, decrease in aerobic metabolism, accumulation of lactic acid, and obvious decrease in muscle explosive force and muscle tone, leading to a decrease in physical activity. 3. Changes in cardiovascular system: In more severe anemia, there will be increased heart rate, heart enlargement and even systolic murmur can be heard. 4. Changes in the digestive system: atrophy of the tongue papilla, anorexia, weak gastrointestinal function, decreased gastric acid, poor digestion and absorption. 5. Neurological changes: Since anemia affects the development of brain cells, causing intellectual backwardness, and this change is irreversible. If anemia occurs, it is recommended to go to the hospital in time, complete the examination, and give targeted treatment or therapy under the guidance of physicians.