Heat illness has specific stages and severities. The first stage would be heat rash (also called prickly heat), which is a stinging skin irritation that turns your skin red. Next is heat cramps.

The first stage is heat cramps ... be prepared to perform CPR, if necessary. Heat-related illnesses can progress rapidly and prompt medical attention is crucial for proper treatment.

[The person in the car] could be going through these stages of illness quickly and unfortunately they could succumb to their illness." Insider's takeaway Heat stroke is a condition in which your ...