A rare case of full neurological recovery from severe nonexertional heatstroke during a bedrock bath

We report a rare case of full neurological recovery in a 77-year-old woman with an initial Glasgow Coma Scale of 3 while taking a bedrock bath. Severe heatstroke was quickly diagnosed, and intensive treatment was immediately provided. Laboratory data showed multi-organ failure, and her electroencephalogram showed very low amplitude, indicating a poor prognosis; however, she gradually recovered consciousness, and her electroencephalogram normalized, showing a Glasgow Coma Scale of 15 at discharge. This case demonstrated that physicians should pay careful attention when withholding treatment from a patient with severe heatstroke accompanied by a poor initial electroencephalogram result and laboratory data.