Symptoms of heat stroke can sometimes mimic those of other medical conditions, such as a heart attack. In many cases, symptoms of heat exhaustion are present before progressing to a heat stroke. Signs and symptoms of heat exhaustion include: - Nausea - Vomiting - Fatigue - Weakness - Headache - Muscle cramps and aches - Dizziness However, it is also possible to develop symptoms of heat stroke quickly and abruptly without warning. Different people may experience various symptoms of heat stroke, the most common of which include: - High body temperature - No sweating, skin is hot red or flushed dry - Rapid pulse - Difficulty breathing - Strange behavior - Hallucinations - Confusion - Agitation - Disorientation - Seizure - Coma