A low hemoglobin of 85g/L is considered moderate anemia and should be treated accordingly depending on the cause of the lowered hemoglobin. Common causes include iron deficiency anemia, megaloblastic anemia, gastric ulcer, aplastic anemia, and pernicious blood system diseases. Treatments include general treatment, medication and surgery. 1. Iron deficiency anemia: due to the lack of iron, hemoglobin synthesis is reduced due to iron supplements such as iron dextrose, ferrous gluconate, etc. It should be noted that iron supplements can cause nausea, gastrointestinal burning sensation and other gastrointestinal tract irritation, and it is recommended to take them after meals. Vitamin C can assist iron absorption. At the same time, pay attention to reasonable diet, nutritional balance. 2. Megaloblastic anemia: mainly due to the lack of folic acid or vitamin B₁₂, the treatment to remove the cause of the disease, supplement folic acid and vitamin B₁₂ is mainly used until the complete disappearance of the anemia symptoms, hemoglobin back to normal. 3. Gastric ulcer: gastric ulcer can cause gastrointestinal hemorrhage resulting in decreased hemoglobin, proton pump inhibitors such as omeprazole, pantoprazole, etc. can be used to inhibit the secretion of gastric acid, the joint application of antibiotics, such as amoxicillin, metronidazole, etc. anti-Helicobacter pylori, and at the same time, magnesium alumino-carbonate can be used to protect the gastric mucosa, and surgery can be carried out to treat severe gastric ulcers. 4. Aplastic anemia: it needs to be treated with cyclosporine orally and other etiological treatments. 5. Malignant hematologic diseases: such as acute myeloid leukemia, need to be cytarabine and other important drugs chemotherapy. Low hemoglobin may also be caused by other reasons such as systemic lupus erythematosus, trauma, etc., should be improved in a timely manner to clarify the cause of the disease, under the guidance of the doctor targeted treatment. All of the above drugs should be used reasonably under the guidance of a doctor to avoid self-medication.