This is a common symptom in the majority of chronic diseases, the majority of cancers, and that includes leukemia. Fatigue in leukemia has two different reasons that contribute to each other. First off, cancer takes a lot of energy from the blood and a lot of resources. Even though patients eat correctly, they may feel weak because cancer is feeding out of blood resources to keep on growing new cells and releasing them to the bloodstream. This process increases your metabolism and makes you feel very tired.
At the same time, we talked about anemia, which is associated with the majority of cases of leukemia. One of the symptoms of anemia is fatigue because the blood becomes unable to transport oxygen, and this element is fundamental in creating ATP, an essential molecule to store and use energy in the body.