Because cancer is caused by cell processes, it can use up a lot of the body's energy. In the case of multiple myeloma, you may already feel tired due to reduced red blood cell count or anemia. Pain in your back or other bones may keep you awake at night, or prevent you from getting quality sleep. Other signs and symptoms of the disease can impact your diet, as well. Together, these factors may leave you feeling fatigued and as if you have no energy. You may even feel confused as if your mind is "foggy." This could be a sign of multiple myeloma.

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