Heat stroke is most common in the summer months; if you plan on spending time outdoors, you’re going to want to know the symptoms to watch out for. Heat stroke occurs when your body temperature rises above 104 degrees Fahrenheit. Someone with heat stroke may experience confusion, altered speech, nausea, vomiting, rapid and shallow breathing, headache and increased heart rate. If you or someone near you experiences a few or all of these symptoms, call 911. This condition requires emergency medical treatment.