Hemoglobin is a special protein that transports oxygen within red blood cells is the main component of red blood cells. The World Health Organization suggests that hemoglobin <130g/L in adult males and <120g/L in adult females can be diagnosed as anemia, while the domestic standard for anemia is based on less than 120g/L in males and 110g/L in females. there are many causes of anemia, including decreased synthesis of red blood cells, such as aplastic anemia, iron deficiency anemia, and megaloblastic anemia. Increased destruction of red blood cells, such as hemolytic anemia; and excessive loss of red blood cells, such as hemorrhage and excessive menstrual flow in women. Except for anemia caused by hemorrhage that requires consultation in the appropriate department or emergency room, anemia due to other causes can be seen in the hematology department to identify the cause and treat it accordingly. Some patients with iron deficiency anemia and megaloblastic anemia are associated with insufficient intake of iron, folic acid and vitamin B12 in the diet and can be treated with dietary supplements in addition to medication. Patients can eat more iron-rich foods, such as red meat (pork, beef, lamb, etc.), animal liver and animal blood products, and increase the intake of vitamin C to promote the absorption of iron. People with megaloblastic anemia can eat red meat, fresh green leafy vegetables and fruits in their diet to assist in raising hemoglobin in the body.