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* Ignoring warning signs, such as weakness, clumsiness, stumbling, nausea, dizziness, apathy or aggression. However, runners that suffer heat stroke may exhibit none, or only one of these warning signs(see below)==Staying Alive in the Heat- The Warning Signs==The best advice seems to be to take things cautiously if you are not used to running in the heat. Pushing yourself harder than normal in familiar heat, or attempting to run normally in heat you are not used to is dangerous. Traveling to a warmer area for a race is especially risky. Look out for the following warning signs, and if you have any doubts, slow down or stop and cool off. * Nausea or vomiting. These symptoms can occur before true heatstroke, as running makes digestion harder. * Weakness. An unusual muscular weakness could be due to low blood sugar, but elevated core temperature also creates weakness. * Headache. This can also be caused by dehydration, or low blood sugar. Having had headaches from each of the three causes, I have found the type of headache is different. My limited experience is that a headache cased by heat is particularly painful and intense. * Dizziness or confusion. This is a serious symptom that suggests either extremely low blood sugar or heatstroke. * Flushed/Hot Skin. I've found that an early warning sign is the feeling that my skin is burning, especially my face.* Panting. Another symptom I've found of overheating is that my breathing becomes labored beyond what is reasonable for the exercise intensity. * Core Temperature. The only sure test is to check your core temperature using something like an in-ear thermometer. Using a mouth thermometer may not be accurate if you've been breathing hard. If you have any doubts, stop and check your temperature. Avoid high intensity interval training in the heat; the intense work can spike your core temperature too high too quickly for you to recover. It's possible that a runner that suffers heat stroke may exhibit none, or only one of these warning signs.