Brown urine and rhabdomyolysis: when to get urgent help

Rhabdomyolysis is rapid breakdown of muscle tissue. Muscle contents, including myoglobin, enter the bloodstream and must be handled by the kidneys. Urine may become dark brown, red-brown or tea-coloured, although visible colour change is not present in every affected person.

Other presentations can include marked muscle pain, swelling, tenderness or weakness, sometimes after intense exertion, heat exposure, prolonged immobility, trauma, illness or a medicine-related reaction. Brown urine also has other possible causes, so appearance alone cannot establish the diagnosis.

Stop strenuous activity and seek urgent medical assessment rather than attempting to exercise through the symptoms. Tell the clinician about recent exertion, heat exposure, injuries, time spent unable to move, illnesses, supplements and medicines.

Evaluation may include blood and urine tests and monitoring of kidney function and body salts. Treatment is chosen according to the cause, examination and test results. Do not delay care while trying to correct dark urine by drinking excessive fluid on your own.

Brown or tea-coloured urine together with severe muscle pain, pronounced weakness or muscle swelling warrants urgent assessment. Go to emergency care if urine output falls, you cannot keep fluids down, confusion develops, you faint, or you feel severely unwell.

After heavy exercise, soreness that seems far more intense than expected or is accompanied by weakness, swelling or dark urine should not be treated as routine post-exercise discomfort. Prompt testing can identify muscle breakdown and kidney stress.

Ask what likely triggered the muscle breakdown, whether any medicine or supplement should be paused, how kidney function and body salts will be monitored, and when activity may safely resume. Request specific return precautions for urine changes, weakness and swelling.