Rhabdomyolysis

Rhabdomyolysis, called rhabdo, is linked to heat stress and long, hard physical work. Muscle breaks down and dies. That releases electrolytes and large proteins into the blood, which can cause irregular heart rhythms, seizures and kidney damage.

Signs include muscle cramps or pain, weakness, and dark urine the color of tea or cola. Some people show no signs. NIOSH says a worker with symptoms should stop activity, drink more liquids (water preferred), and seek immediate care at the nearest medical facility. Ask to be checked for rhabdo. Rhabdo is not a drink-it-off problem. Heavy work in the heat without acclimatization raises the risk. See heat stress.