Rhabdomyolysis, or rhabdo, is a serious condition caused by muscle damage. It can strain the kidneys and lead to severe health issues. Runners should watch for symptoms like muscle pain, swelling, and dark urine. These can be mistaken for normal soreness after a race.

Heat and dehydration increase the risk of rhabdo. Long races in hot weather can make it hard to gauge effort. NSAIDs like ibuprofen can also heighten the risk of renal damage. Some races have banned painkillers to ensure runner safety. Read more culture coverage.

Other risks include heat exhaustion, heat stroke, and hyponatremia. Gradual increases in mileage and hydration are key. After a tough run, seek medical help for severe symptoms. Awareness and caution can help prevent serious health issues. Related: Apple Watch Series 12 Aids Marathon Training and Race Day.

This original Runner World brief is based on reporting from Canadian Running. Visit the source for its complete reporting, context and any later corrections.