4. Nausea and Vomiting
Another indication that simple heat exhaustion has turned into something more severe is nausea. A constant uneasy feeling in your stomach, especially in combination with dizziness, could mean that your heat related condition is worse than you may have thought. Make sure that you drink a lot of water to help ease the nausea. If your nausea progresses into vomiting it is a definite sign that you have developed heat stroke.
It is quite critical that you seek out medical care as fast as possible if you begin to vomit with your heat related injury and also have some of the other symptoms on this list. Drinking water on the way to seeking medical attention can help as it will keep you somewhat hydrated. While it may be difficult to drink anything when you are feeling this bad, at least attempting small sips of water can go a long way.