Remember to stay hydratedSummer is the time for outdoor fun and activities, but as temperatures rise, staying properly hydrated becomes even more important. Even mild activity will increase your body temperature and your body’s need to sweat.All of this water needs to be replaced, as well as minerals such as sodium and potassium.Replacing water without sufficient sodium can quickly produce hyponatremia, a potentially fatal condition.Hyponatremia symptoms are similar to those of heat exhaustion and heat stroke and can include nausea, muscle cramps, disorientation, confusion, seizures, coma and death.Ideally, anyone engaging in outdoor activity in the heat or even an indoor exercise program should drink eight to 12 ounces of fluid every 15 to 20 minutes during a session.