“The earliest phase of heat stroke is called a hyperthermic neurologic phase,” Dr. Bangash said, noting, “you'll see hyperthermia, a significant elevation of body temperature, causing confusion, slurred speech, agitation and sometimes irritability. In severe cases, seizures and coma are possible.” Skin is mostly dry in heat stroke

“Heat exhaustion is one of the milder forms of heat-related illness. It occurs when the body loses an excess amount of water and salt, typically from sweating,” Dr. Bangash said. “So, people who have heat exhaustion can experience generalized weakness and excessive sweating.”

Meanwhile, “heat stroke is the more severe form of heat-related illness, where you see more neurologic symptoms and much less sweating because the sweating mechanisms have been exhausted,” he said.