What should you know about clinical signs of rhabdomyolysis?

The symptoms are not identical in everyone, and dark urine may be absent. Rhabdomyolysis means damaged muscle cells are releasing their contents into the bloodstream; this can disrupt body chemistry and injure the kidneys, so suspected cases need prompt medical assessment.

The pain is often more intense than expected for the activity and may be accompanied by pronounced tenderness, tight swelling or difficulty moving the affected muscles. Weakness can make ordinary tasks unusually hard. Urine may look tea-coloured, cola-coloured or reddish-brown because muscle pigment is being cleared through the kidneys.

Heavy exertion is one possible trigger, especially with heat, dehydration or an abrupt increase in training. Crushing injuries, seizures, prolonged immobility, infections, metabolic problems and some medicines or substances can also damage muscle. Symptoms alone cannot confirm the condition; clinicians use blood and urine tests and assess kidney function and body salts.

Stop strenuous activity and seek urgent medical advice rather than trying to exercise through severe symptoms. Tell the clinician about recent exercise, heat exposure, injury, illness, seizures, prescribed medicines, supplements and recreational substances. Do not discontinue an essential prescribed medicine without clinical advice unless an emergency professional directs you to do so.

Treatment depends on the cause and test results. Medical teams may give fluids, monitor urine output and repeat blood tests while correcting electrolyte disturbances. Hospital observation may be required when there is kidney injury, significant swelling or abnormal body chemistry.

Seek urgent medical assessment for dark urine with muscle pain or weakness, severe or rapidly worsening muscle swelling, markedly reduced urination, confusion, fainting, persistent vomiting or symptoms after a crush injury. Call emergency services for collapse, breathing difficulty, a seizure or severe heat illness. Do not wait for all of the commonly described signs to appear before seeking help.

Ask what likely triggered the muscle injury, whether kidney function and electrolyte levels are stable, and which medicines or supplements need review. Before returning to work, sport or training, discuss what symptoms should stop activity, how exertion should be increased, and whether follow-up blood or urine testing is needed.