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Illustration of a man overexercising and the resulting syndrome of rhabdomyolysis. Rhabdomyolysis is the breakdown of skeletal muscle tissue, which releases large amounts of myoglobin into the bloodstream. Causes include excessive exercise, heatstroke, infections, substance abuse, and trauma.
Illustration of the brain and spinal cord superimposed on the body of a man, back view, with a background of neurons afflicted by multiple sclerosis. Multiple sclerosis is a neurodegenerative disease, and is characterized by demyelination of the axons of neurons in the central nervous system.