Signs that may indicate chronic kidney disease: A Clinical Guide to Symptoms and Testing

Signs that may indicate chronic kidney disease can include changes in urination, swelling, fatigue, nausea, itching, and muscle cramps, but early chronic kidney disease often causes no noticeable symptoms. CKD develops when damaged kidneys cannot filter blood normally, allowing waste and extra fluid to accumulate. Because symptoms alone cannot establish a diagnosis, people with diabetes, high blood pressure, cardiovascular disease, or a family history of kidney disease may need medical testing even when they feel well. 1

Why early kidney disease can be difficult to recognize

Chronic kidney disease commonly develops slowly, and the kidneys can lose function before a person notices a clear physical change. The condition may remain silent until kidney damage is advanced, which is why relying only on symptoms can delay assessment. Diabetes and high blood pressure are major risk factors, while cardiovascular disease, family history, and increasing age can also raise risk. Identifying CKD earlier can help clinicians address its cause and slow further loss of kidney function. 1

• Early CKD may produce no symptoms, even when kidney function is changing. 2
• Risk-based screening is particularly relevant for people with diabetes or high blood pressure. 2

Changes in urination and urine appearance

Urinary changes are among the findings that may prompt an evaluation for kidney disease. These can include urinating more often, urinating less often, waking repeatedly at night to urinate, or noticing foamy urine. Blood in the urine can also occur, although it has multiple possible causes and should not automatically be attributed to CKD. Urine changes may be temporary or related to another condition, so laboratory testing is needed to determine whether kidney damage is present. 5

• Foamy urine may reflect excess protein in the urine, an abnormal finding that can accompany kidney damage. 5
• Visible or laboratory-detected blood in urine warrants medical assessment because it is not specific to one diagnosis. 3

Swelling caused by fluid retention

Swelling in the ankles, feet, legs, hands, or around the eyes may appear when impaired kidney function affects the body’s fluid balance. The kidneys normally remove excess fluid, so reduced filtering can contribute to fluid retention. Swelling is not unique to CKD and may also have other medical explanations, but new or worsening edema is a relevant sign to discuss with a clinician. Marked swelling accompanied by breathing difficulty requires prompt medical evaluation. 3

• Swelling can affect the lower limbs, hands, or facial area, including the region around the eyes. 4
• Shortness of breath can occur when fluid accumulates or when CKD complications become more advanced. 4

Fatigue, concentration, and sleep changes

Declining kidney function can be associated with fatigue, weakness, difficulty concentrating, and sleep problems. These symptoms may develop as waste products accumulate or when CKD contributes to complications affecting overall health. They are nonspecific and can result from many other conditions, including disrupted sleep or anemia, so they cannot confirm kidney disease by themselves. Persistent or unexplained tiredness becomes more important when it occurs alongside swelling, urinary changes, or a known CKD risk factor. 6

• Fatigue and reduced energy are recognized possible findings as kidney disease progresses. 4
• Difficulty concentrating and sleep disruption may accompany more advanced impairment. 6

Nausea, appetite changes, itching, and cramps

As kidney function declines, some people develop nausea, reduced appetite, persistent itching, dry skin, or muscle cramps. These symptoms are associated with the kidneys’ roles in waste removal, fluid regulation, and mineral balance. They are not specific to CKD, and isolated itching or nausea has many potential causes. However, a cluster of these symptoms, particularly with changes in urination or swelling, should be included in a medical history and evaluated rather than self-diagnosed. 1

• Nausea and appetite changes may occur when kidney function is substantially reduced. 6
• Itching and muscle cramps are reported among possible symptoms as CKD advances. 4

How chronic kidney disease is confirmed

Symptoms cannot confirm or exclude chronic kidney disease. Assessment generally uses a blood test to estimate glomerular filtration rate and a urine test to identify albumin or other abnormalities. Blood pressure measurement and, when indicated, imaging can provide additional information about kidney structure and related disease. Results are interpreted over time because CKD is a long-term condition, and a single symptom or isolated test result does not establish the full diagnosis. 1

• Estimated glomerular filtration rate is derived from a blood test and helps assess filtering function. 2
• Urine albumin testing can detect protein loss that may indicate kidney damage. 5
• Prompt assessment is appropriate for markedly reduced urination, severe shortness of breath, confusion, or blood in the urine. 4

Sources

1. National Institute of Diabetes and Digestive and Kidney Diseases, What Is Chronic Kidney Disease in Adults? https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/what-is-chronic-kidney-disease
2. Centers for Disease Control and Prevention, About Chronic Kidney Disease. https://www.cdc.gov/kidney-disease/about/index.html
3. National Health Service, Kidney Disease Symptoms. https://www.nhs.uk/conditions/kidney-disease/symptoms/
4. Mayo Clinic, Chronic Kidney Disease: Symptoms and Causes. https://www.mayoclinic.org/diseases-conditions/chronic-kidney-disease/symptoms-causes/syc-20354521
5. National Kidney Foundation, What Is Kidney Disease? https://www.kidney.org/kidney-topics/what-is-kidney-disease
6. Cleveland Clinic, Chronic Kidney Disease. https://my.clevelandclinic.org/health/diseases/15096-chronic-kidney-disease-ckd