Heat stroke can lead to unconsciousness and death true or false?

Yes

If it is untreated, it can damage your brain, heart, kidneys and muscles.

true.

Explanation:

A heat stroke is a form of illness caused by severe exposure to heat in which the body temperature rises up to 40 degrees Celsius. Heat strokes can come about due to external environmental conditions or internal reactions (caused by substances like certain medicines). This condition can cause unconsciousness, seizures, and even kidney failure. If untreated, it can cause death.