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Some people with more advanced kidney problems describe:
* brain fog
* difficulty focusing
* reduced alertness
* problems remembering things
These symptoms are nonspecific and can also be caused by stress, poor sleep, medications, or many other conditions.
## 3. Swollen Ankles and Feet
The kidneys help control sodium and fluid levels.
When kidney function declines, excess fluid may collect in the tissues, causing swelling in the:
* feet
* ankles
* lower legs
* hands
* sometimes the face
Swelling can also be caused by heart, liver, vein, or circulation problems.
## 4. Puffy Eyes in the Morning
Persistent puffiness around the eyes can sometimes occur when protein leaks into the urine.
Occasional morning puffiness may simply result from sleep, allergies, or salt intake, but repeated swelling deserves attention.
## 5. Foamy Urine
