In the case of men, hemoglobin 113g/L is slightly lower than the lowest value of the normal range of 120g/L. In the case of women, hemoglobin 113g/L is within the normal range, but very close to the lowest value of the normal range of 110g/L. Overall hemoglobin 113g/L is slightly low, and the common causes include drinking a lot of fluids, malnutrition, and anemia. 1. Drinking a lot of water: If you drink a lot of water or have a lot of fluids before the test, it may cause a decrease in hemoglobin concentration. 2. Malnutrition: If there is malnutrition, especially the lack of vitamins in the body, it can cause a decrease in hemoglobin concentration. 3. Anemia: when the body’s iron intake is insufficient, it can cause iron deficiency anemia, resulting in low hemoglobin levels. In addition, it may also be megaloblastic anemia, hemolytic anemia and other diseases. 4. Other blood system diseases: such as aplastic anemia, acute leukemia, etc. can also cause low hemoglobin. In addition, radiotherapy and other factors may also cause low hemoglobin. You should bring the test results to the hospital in time to find out the cause of low hemoglobin and carry out targeted treatment under the guidance of the doctor.