Warning signs include:
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Very dark yellow or brown urine
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Foamy urine that persists (may indicate protein loss)
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Frequent nighttime urination
2. Check for swelling
Kidney dysfunction can cause fluid retention. Gently press your fingers against:
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Ankles
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Feet
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Eyelids
If indentation remains for several seconds, this may signal impaired kidney filtration.
3. Assess lower back discomfort
Persistent dull pain or soreness on either side of the lower back (near the waist) — not related to muscle strain — can sometimes be linked to kidney issues.