Kidney disease and anemia are closely linked. The kidneys produce a hormone that signals the body to make red blood cells, so when they're failing, that signal weakens.
Fewer red blood cells mean less oxygen circulating through the body, which shows up as tiredness, shortness of breath, and a general feeling of running on empty. A simple blood test can confirm anemia, and from there, your doctor can work out whether kidney disease is driving it.

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