Hemoglobin value 80g/L is anemia. Hemoglobin values of adult males <120g/L, females <110g/L, and pregnant women <100g/L are considered to have anemia, and a hemoglobin value of 80g/L is considered to be moderate anemia. The common causes of low hemoglobin are: 1. Iron deficiency anemia, iron is an important raw material for hematopoiesis, insufficient iron is insufficient raw material for hematopoiesis, which can lead to anemia. 2. Chronic intestinal inflammation and poor digestion and absorption, parasitic infections, chronic infectious diseases, is also a major cause of anemia, in addition to nutritional supplementation of these diseases also need to treat the primary disease. For example, parasitic infections should be treated with drugs such as albendazole. 3. Folic acid and vitamin B₁₂ deficiency leads to megaloblastic anemia, and hemoglobin also decreases. This problem is common in pregnant women and women with poor diets, and requires supplementation with folic acid, vitamins and minerals. 4. Leukemia, aplastic anemia and other blood system diseases can also cause anemia. Patients are advised to go to the hospital for further examination to find out the cause of anemia and treat it under doctor’s guidance.