Anemia can cause tinnitus. When anemia is severe, various organs of the body are in a state of ischemia and hypoxia. The nervous system can exhibit symptoms such as dizziness, headaches, and a feeling of heaviness in the head, as well as tinnitus. At this point, infusing red blood cells to correct the anemia can alleviate symptoms like tinnitus. It is also important to actively seek the underlying causes of the anemia. Anemia can be categorized based on the size of red blood cells into microcytic hypochromic anemia, normocytic anemia, and macrocytic anemia. Microcytic hypochromic anemia is commonly seen in chronic disease anemia and iron deficiency anemia, normocytic anemia is commonly found in conditions such as leukemia, multiple myeloma, and acute blood loss anemia, while macrocytic anemia is typical in megaloblastic anemia and myelodysplastic syndromes.