Fatigue is extremely common, however, and should never automatically be interpreted as kidney disease. Poor sleep, stress, anemia unrelated to kidney function, infections, thyroid problems, nutritional deficiencies and many other conditions can produce similar symptoms. The pattern and persistence of fatigue matter more than a single tired day. Someone experiencing unexplained fatigue that continues despite adequate rest should consider discussing it with a healthcare professional, particularly if other symptoms or kidney-disease risk factors are present.

Another possible sign is swelling, medically known as edema. Healthy kidneys help regulate the amount of sodium and water in the body. When kidney function becomes impaired, excess sodium and fluid can accumulate rather than being removed normally. This can contribute to swelling in the feet, ankles and legs and, in some circumstances, the hands or face. Swelling may become more noticeable later in the day or after prolonged periods of standing, although patterns differ depending on the cause.

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Kidney-related swelling can also occur when significant amounts of protein are lost through the urine. Albumin is an important blood protein that helps maintain fluid within blood vessels. Certain kidney diseases damage the filtering structures in ways that allow albumin to escape into the urine. When blood albumin becomes low, fluid may move into surrounding tissues more readily. This can contribute to puffiness around the eyes as well as swelling elsewhere in the body.

Swelling is not specific to kidney disease.  Heart problems, liver disease, problems with leg veins, certain medications and several other medical conditions can also cause edema. Even prolonged sitting can cause temporary ankle swelling in some people. New, persistent or rapidly worsening swelling deserves medical evaluation rather than assumptions about its cause. Sudden swelling accompanied by difficulty breathing can be particularly concerning and may require urgent medical attention.

Changes in urination are another reason people sometimes seek kidney evaluation. Chronic kidney disease can be associated with urinating more frequently or less frequently than usual, and some people notice an increased need to urinate at night. Other kidney or urinary tract conditions may cause discomfort, changes in urine appearance or blood in the urine. Because the kidneys produce urine, changes in kidney function can sometimes alter urinary patterns. However, many people with kidney disease continue producing apparently normal amounts of urine, especially in earlier stages.