What should you know about minor rhabdomyolysis?

Rhabdomyolysis occurs when damaged muscle cells release their contents into the bloodstream. It can follow unusually intense exercise, heat exposure, prolonged pressure on a muscle, injury, seizures, or certain medicines and substances. Symptoms may include muscle pain, weakness, swelling, marked tenderness, and urine that looks unusually dark. Symptoms are not always dramatic, so a clinician may use an examination and blood and urine tests to judge muscle injury and kidney function.

Stop strenuous exercise and contact a medical service promptly for advice, particularly after heavy exertion with weakness, swelling, or dark urine. Do not try to train through the symptoms or self-treat with large amounts of fluid without guidance. Tell the clinician about recent exercise, heat, injuries, supplements, recreational substances, and prescribed medicines. Follow advice about fluids, monitoring, and activity; treatment depends on examination and test results.

Go to urgent care for dark or reduced urine, worsening weakness, severe muscle swelling, confusion, fainting, chest symptoms, or trouble breathing. Seek immediate help if you cannot move an affected limb or feel severely unwell after exertion. New symptoms after a crush injury, prolonged immobility, or heat illness should not be watched at home. Muscle soreness after exercise alone may be ordinary, but unusual severity or weakness changes the decision.

Ask which tests are needed, whether your kidneys need monitoring, how much activity is safe, and which medicines or supplements should be paused. Confirm the symptoms that should send you back for urgent review.