3. Itchy Skin
Itching that persists and disrupts sleep can be a subtle but telling symptom of declining kidney function. When kidneys fail to filter toxins properly, these waste substances build up in the bloodstream and irritate nerve endings in the skin.
This symptom is often misattributed to dry skin or allergies, leading many to try topical creams without relief. In reality, persistent itching, especially when accompanied by other signs of kidney trouble, should prompt evaluation of kidney function.
4. Swelling with Pitting
Fluid retention is a hallmark of kidney impairment. When kidneys cannot efficiently remove excess fluid, swelling occurs, commonly in the ankles, feet, or hands. This swelling is often described as “pitting” because pressing on the swollen area leaves a visible dent that lasts several seconds.
Many individuals blame salt intake or standing too long for swelling, but persistent pitting edema is a clinical sign that kidney filtration is compromised. If you notice this swelling, especially if it worsens over time, a kidney function panel including serum creatinine and estimated glomerular filtration rate (eGFR) should be considered.
5. Feeling Cold Despite Warmth
Kidneys produce erythropoietin, a hormone that stimulates red blood cell production. When kidney function declines, erythropoietin levels fall, leading to anemia. Anemia reduces oxygen delivery to tissues, causing symptoms like feeling cold even when others are comfortable.
This chronic anemia is often overlooked as a cause of cold intolerance. If you find yourself frequently chilly indoors or despite wearing warm clothing, discuss with your doctor whether an anemia workup and kidney function tests are appropriate.
