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Nausea, vomiting and reduced appetite can develop when kidney disease becomes advanced. When the kidneys cannot remove waste products effectively, those substances can accumulate in the blood. This state can contribute to gastrointestinal symptoms and changes in how food tastes. Some people may lose interest in eating or experience unintended weight loss. These symptoms are more commonly associated with significant loss of kidney function than with the earliest stages of chronic kidney disease.
Once again, nausea and appetite changes have many possible causes. Gastrointestinal infections, medications, stress, pregnancy, liver disease and numerous other conditions can produce similar symptoms. A single episode of nausea is therefore not evidence of kidney dysfunction. Persistent nausea, unexplained loss of appetite or unintended weight loss deserves medical attention regardless of whether kidney disease is suspected.
Some people with advanced kidney disease also describe an unusual or metallic taste in the mouth. Changes in taste can occur as waste products accumulate, although this symptom is not unique to kidney disease. Medications, dental problems, infections and several other conditions can affect taste. If taste changes occur together with nausea, poor appetite and known kidney impairment, clinicians may consider whether declining kidney function is contributing.
Dry or persistently itchy skin is another possible symptom associated with chronic kidney disease, particularly in more advanced stages. Healthy kidneys help maintain appropriate balances of minerals in the bloodstream. Advanced kidney dysfunction can disturb calcium, phosphorus and other mineral-related processes. People with kidney disease may also experience chronic itching, sometimes called CKD-associated pruritus. The mechanisms behind this symptom are complex and are not explained by a single mineral imbalance alone.
Itching can significantly affect quality of life for some people with advanced kidney disease, including those receiving dialysis. It may interfere with sleep and produce persistent discomfort. However, ordinary dry skin is extremely common and is usually unrelated to kidney function. Allergies, eczema, environmental conditions, medications and many dermatological disorders can cause itching. Persistent unexplained itching should therefore be evaluated rather than used as a standalone kidney diagnosis.