Severe Anemia: Mild anemia can lead to dizziness, fatigue, and pallor, while severe anemia may cause dizziness, tinnitus, headaches, and memory loss. Various types of anemia, such as iron-deficiency anemia and hemolytic anemia, require examination by a hematologist. In cases of small cell, low pigment anemia, often caused by iron deficiency, further examination of ferritin levels is necessary to confirm iron deficiency.