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Muscle cramps can also occur in people with chronic kidney disease. The kidneys play an important role in maintaining electrolyte and mineral balance, and disturbances involving substances such as calcium, phosphorus, sodium or potassium can affect muscle and nerve function. People with advanced disease may experience muscle aches or cramping, including cramps in the legs. Kidney failure and dialysis can create additional factors contributing to cramping.
Muscle cramps are also common in people without kidney disease. Exercise, dehydration, medications, pregnancy and other conditions can produce them. Persistent or severe cramps, particularly in someone with known kidney disease, should be discussed with a healthcare professional. People should not attempt to correct suspected potassium or other electrolyte abnormalities with supplements without medical advice because excessively high or low electrolyte levels can be dangerous.
Shortness of breath can occur with advanced kidney disease for more than one reason. Fluid retention can contribute to excess fluid in or around the lungs in severe cases, making breathing more difficult. Anemia associated with chronic kidney disease can also reduce oxygen delivery and contribute to breathlessness during activity. Because shortness of breath can indicate serious problems involving the heart, lungs or other systems, it should not be assumed to originate from the kidneys.
New or severe difficulty breathing can require urgent medical attention. Chest pain, fainting, confusion or rapidly worsening breathlessness are particularly concerning. Online symptom lists should never encourage someone to wait for additional kidney-related signs before seeking help for significant breathing difficulty. A healthcare professional needs to determine the underlying cause and decide what treatment is necessary.
Difficulty concentrating can occur when kidney function becomes severely reduced. Waste accumulation, anemia, sleep disruption and other complications can contribute to problems with attention or mental clarity. Some people describe feeling mentally slower or having difficulty completing tasks that previously felt routine. Advanced kidney failure can cause more serious neurological symptoms. These symptoms generally occur in a broader clinical context rather than serving as an isolated early warning sign.