First tell a small story: after retirement, Master Wang still adhere to sports, every day will jog two laps in the nearby garden. However, in the past half month, Master Wang ran half of the upper air, the whole body has no strength. In fact, he is only 65 years old, slow down the pace of running can not. The most recent time even fainted on the garden. The partners took him to the hospital for emergency examination and resuscitation, and the final conclusion was that “anemia” caused the sports syncope. The anemia fainting of Mr. Wang shook the elderly in the community, and they went to the hospital to check their blood. As a result, among more than 50 elderly people, 2 were found to be severely anemic, 6 were moderately anemic, and almost half were mildly anemic. Among the 2 people with severe anemia, 1 person was found to have gastric cancer and the other person had aplastic anemia. So, why are the elderly prone to anemia? The main reasons are as follows: 1. Changes in the bone marrow hematopoietic microenvironment and its effects (1) As the human body ages, the bone marrow fatty tissue gradually increases and the red marrow for hematopoiesis decreases. (2) Insufficient androgen secretion in the elderly leads to a decrease in erythropoietin, which affects the differentiation and maturation of red lineage stem cells. (3) The oxidative activity and metabolic function of various enzymes in the red blood cells of the elderly are reduced, which leads to an increase in the fragility of red blood cells and shortens their life span. (2) Insufficient uptake of hematopoietic substances and absorption disorders The gastrointestinal function of the elderly decreases, the gastric mucosa atrophies, gastric acid secretion decreases, and the absorption of nutrients (including iron, folic acid, vitamin B12, etc.) is poor; the gastrointestinal motility of the elderly decreases, easily leading to constipation, and if improperly applied drugs can lead to gastrointestinal dysfunction, affecting the absorption of nutrients. In addition, due to dietary disorders, or the quantity and quality of food is not reasonable, will also affect the absorption of nutrients. 3. Lower immune function The general decrease of immune function in the elderly can cause cellular immune abnormalities, and the normal tissues of the body are destroyed by their own immune active cells and autoantibodies, resulting in autoimmune anemia; due to the lower immune function, it is easy to cause infectious diseases and tumors, thus producing secondary anemia. Finally, we remind all elderly people that when symptoms such as dizziness, weakness, panic and pallor occur, they should go to the hospital promptly to clarify whether anemia exists and the causes of anemia.