completely different causes. What matters most is whether they are persistent, worsening, or occurring together.
## 1. Persistent Fatigue
Feeling tired after a difficult day is normal. But ongoing exhaustion, weakness, or unusually low energy can sometimes occur when the kidneys are not working properly.
Kidney disease can contribute to anemia and the buildup of waste products in the blood, both of which may affect energy levels.
## 2. Trouble Concentrating
Some people with more advanced kidney problems describe:
* brain fog
* difficulty focusing
* reduced alertness
* problems remembering things
These symptoms are nonspecific
