Normally, red blood cells deliver oxygen to different cells of the body so the cells can have enough energy to do their activity. When there's a disease that affects red blood cells, various organs inside the body can't get the energy they need. As a result, the child will feel tired and exhausted all the time and won't be able to do their normal daily activities. They may also feel weak and unable to focus. Fatigue isn't specific to sickle cell anemia and can occur with other different types of anemia, as well as numerous other conditions.
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