Thalassemia is a hereditary blood disorder, where the body does not produce enough hemoglobin. These blood cells cannot always function properly, and the body has difficulty oxygenating the tissues. There are different types of thalassemia, and severity varies. Some people show no symptoms, while others develop anemia, and need regular blood transfusions. Symptoms include fatigue, dizziness, cold hands/feet, slow growth, and weakness. I painted this picture showing healthy blood cells and thalassemia blood cells, and also some symptoms.