What should you know about kidney disease rhabdomyolysis?

Severe muscle injury, unusually strenuous exercise, heat exposure, prolonged pressure, seizures, infection or some medicines can damage muscle cells. Their contents enter the bloodstream and may overwhelm the kidneys’ filtering work. Muscle pain, swelling, weakness and dark or tea-coloured urine can occur, although symptoms are not always complete. Kidney problems may develop even when the initial muscle discomfort seems manageable.

Ordinary muscle soreness after exercise usually settles with rest and does not cause dark urine or marked weakness. A clinician may use blood and urine tests, repeat measurements and an examination to judge muscle injury, hydration and kidney function.

Stop strenuous exercise and seek medical advice promptly if rhabdomyolysis is suspected. Do not restart training simply because soreness improves. Tell the clinician about recent exertion, heat, injury, supplements, alcohol and medicines. Treatment may involve monitored fluids and management of the trigger, with observation of urine output and kidney tests. Do not force large amounts of fluid or change prescribed medicines without clinical direction, especially if you already have kidney or heart disease.

Seek urgent assessment for dark urine, very little urine, worsening muscle swelling, severe weakness, confusion, faintness, chest symptoms or difficulty breathing. Go promptly after intense exertion if muscle pain is out of proportion or accompanied by marked fatigue. Kidney injury and dangerous changes in body salts can progress without reliable warning from pain alone.

Ask which tests will check muscle injury and kidney function, whether any medicine or supplement could have contributed, how much activity is safe during recovery, and which urine or muscle symptoms require immediate return.