1. Ankle Swelling.

Those with renal failure are at increased risk for developing swelling in their lower extremities. An issue with the sodium filtration system could be to blame. If they also have kidney disease, they may be experiencing fluid retention. Ankles and legs may swell for a variety of reasons. Ankle swelling, however, is a warning sign of kidney failure and should prompt a trip to the doctor.

2. Sleeplessness.

Lack of sleep, or insomnia, may be another indicator of renal failure. Among the many possible causes are chemical imbalances and electrolyte imbalances brought on by renal failure. A lack of sleep could be an indicator of kidney failure.

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