What should you know about early rhabdomyolysis?

Damaged muscle can release substances into the bloodstream that strain the kidneys and disturb the body's chemical balance. Triggers include unusually hard exercise, heat exposure, crush injury, seizures and some medicines or substances. Symptoms may be stronger than expected after activity and can affect large muscle groups.

Stop strenuous exercise and seek medical advice promptly if symptoms are unusual, severe or worsening. Do not train through marked weakness or swelling. Tell the clinician about recent exercise, heat, injury, supplements and medicines. Testing commonly includes blood and urine checks, and treatment may involve monitored fluids or other care based on the results. Ordinary [Muscle Soreness After Exercise](/symptoms/muscle-soreness-after-exercise/) is not the same diagnosis.

Go to urgent care for dark or tea-coloured urine, very little urine, severe muscle swelling, profound weakness, confusion, fainting, chest symptoms or trouble breathing. Heat illness or a crush injury requires emergency attention even if pain initially seems limited.

Ask which tests are needed, how much activity and fluid intake are safe, whether a medicine or supplement may contribute, and when exercise can be restarted.