Symptoms include thirst, dry mouth, exhaustion, confusion, and low blood pressure. Cease activity, and slowly drink water to replenish the body's lost fluids. Heat exhaustion is often caused by dehydration, and may lead to weakness, muscle spasms and nausea which last for several hours or even days. Athletes experiencing the beginning of heat exhaustion should rest, drink small sips of water, and apply wet towels to the head and neck. Heat stroke, also caused in part by extreme dehydration, causes athletes to collapse or lose consciousness.
Heat stroke requires immediate medical attention.
Preventing the above injuries and conditions is much easier than it may seem. Resistance training greatly improves flexibility. Rest when you think you may have hurt yourself, and be sure to drink plenty of water before and after exercise. Above all, maintain a healthy diet and lifestyle to keep the body in optimal condition. If you think you're seriously injured, seek a doctor's help immediately.