The body gets tired when it has to fight off infections. Thus, a lack of energy is very common with kidney infections. However, you shouldn’t fight the fatigue, since you will need to rest to fight off the infection. Fatigue can take place as tiredness but might also be experienced as mental fog, slowness, and lethargy in the muscles and limbs.
Dehydration and a lack of proper nutrition can also cause fatigue. Make sure you are drinking plenty of fluids and trying to eat light meals. Your body needs nutrients to power through the infection.