How to Prevent Dehydration, and When to Visit the ER
By Daniel Elwell, DO
Physicians Premier Medical Director for Portland, TX
As an emergency medicine specialist, I’ve seen many Texans’ summer plans ruined by an often-preventable condition: dehydration.
In the ER, we frequently see people who’ve tried to push through thirst, fatigue or weakness for too long in hot weather. By the time nausea, confusion or poor balance develops, they’re facing a potential medical emergency.
Water makes up half or more of an adult’s body weight and is essential for normal cell and organ function. Lack of water caused by dehydration can reduce blood flow to your kidneys, heart and other vital organs. Without proper treatment, dehydration can lead to serious health problems such as kidney damage, seizures, shock from low blood volume and even death.
Dehydration happens when the body loses more fluid than it takes in. Hot weather raises the risk because sweating removes water and electrolytes—essential minerals like magnesium and sodium—from your body. If you are already behind on drinking water when you go out in warm weather, you have less fluid reserves to make up for what you lose through sweat.
Whether you’re heading out for summer vacation or going to work or sports practice in the heat, keep these dehydration awareness and prevention tips top of mind.
Who Is Most at Risk of Dehydration?
Anyone can become dehydrated, and some people have a higher level of risk:
- Older adults may not adjust to temperature changes as efficiently.
- Young children can lose water quickly while playing and then struggle to recover. They depend on adults to offer fluids and notice changes in behavior that might signal dehydration.
- Athletes and outdoor workers can lose a large amount of fluid on hot days, even if they are physically fit.
- People with severe cold/flu symptoms risk dehydration when illness leads to fluid loss or prevents normal fluid intake due to vomiting, diarrhea, fever or a severe sore throat.
People who have been told to limit fluids because of a heart or kidney condition may also be at elevated risk. Chronic conditions or medications such as beta blockers can also affect thirst, sweating, circulation or fluid balance. Talk with a doctor about how to handle hot weather with your specific health condition.
What Are the Early Signs of Dehydration?
The early signs of dehydration can be subtle. Recognizing them can make all the difference between a simple recovery and a medical emergency.
Thirst is the first clue of potential dehydration. Other early dehydration symptoms in adults can include:
- Dry mouth
- Darker urine or urinating less often
- Fatigue or unusual weakness
- Feeling excessively warm
These symptoms are a signal to stop exerting yourself and address your body’s needs. Move into shade or air conditioning, rest and start sipping fluids right away.
Signs of Dehydration in Children
Parents and caregivers often know a child’s normal energy and behavior better than anyone. Noticeable changes during or after outdoor activity should be taken seriously.
A child who is fussy, unusually sleepy, less interested in playing or unwilling to eat may be under heat stress. Dry mouth, fewer tears and fewer wet diapers are other warning signs.
In more serious cases, kids may have sudden balance problems, seem “out of it” or lethargic or have trouble waking up. These symptoms require emergency medical care. Young children are not always aware of changes in their own bodies, and they may show changes in behavior before they ask for water. During hot, sunny days, monitor your child carefully to make sure they stay hydrated.
Are Heat Exhaustion and Dehydration the Same?
Dehydration and heat exhaustion symptoms overlap, although the terms describe different problems:
- Dehydration is a lack of fluid. It can happen even in cooler weather.
- Heat exhaustion is the body’s response to excessive heat and the loss of water and salt.
Heat stroke is a medical emergency. The clearest warning sign is a change in brain function. Someone may become confused, disoriented, agitated, uncoordinated or unconscious. They may have a seizure in severe cases. Both dehydration and heat exhaustion can cause weakness, nausea, dizziness, and a headache or cramps.
When Should You Go to the ER for Dehydration or Heat Exhaustion?
For more mild symptoms, follow this at-home treatment plan right away:
- Stop the outdoor activity.
- Move to a cooler environment.
- Loosen or remove unnecessary clothing.
- Sip water or an appropriate electrolyte drink.
- Use ice packs or frozen food or drinks to cool off.
- Monitor symptoms closely.
Don’t start drinking salty liquids! This is a common piece of medical misinformation. While an electrolyte drink may be helpful during a sweaty workout, concentrated salt (like pickle juice or salt tablets) can cause complications. People with high blood pressure, kidney disease or other medical concerns should avoid high-sodium products.
If you’ve been sweating a lot or have been exposed to extreme heat, play it safe. Seek emergency care if cooling and fluids don’t help, or if the person develops serious symptoms such as:
- Vomiting prevents hydration
- Chest pain
- Shortness of breath
- Severe weakness or fainting
- Continued heavy sweating
- Sudden absence of sweating, sometimes with goosebumps
Call 911 if a person has altered behavior, faints, has a seizure or cannot walk normally. Begin cooling the person while help is on the way. Move them out of the heat, remove extra layers of clothing, apply cool wet towels or sheets and use a fan if available. Do not force fluids if the person is confused, vomiting or unable to swallow safely.
How Do ER Doctors Treat Dehydration?
When someone arrives at Physicians PremiER with dehydration or heat illness symptoms, our first priority is to check their temperature, vital signs, mental status and circulation.
Depending on the patient’s symptoms and medical history, we may also test their electrolyte levels, perform a kidney function analysis or test for anemia or other problems that can complicate recovery.
Emergency room staff know how to quickly evaluate how severe your dehydration symptoms are and identify the right treatment for your specific combination of those symptoms and other factors:
- If the patient can drink and has only mild symptoms, we provide water or a rehydration beverage such as Pedialyte.
- If the patient has nausea, vomiting, confusion or severe weakness, IV fluids can help with quick rehydration. Medication can help with nausea.
Physicians PremiER emergency rooms are designed to keep patients calm and comfortable, with private, quiet rooms rather than a hectic traditional ER waiting room. Getting personal attention, paired with our advanced medical equipment, gives you the best chance of making a quick recovery from dehydration or heat illness.
How Long Does It Take to Recover From Dehydration?
Feeling better after replacing your fluids does not always mean the body is ready for another day in the heat. I have seen patients improve, then return to work or practice the next day and become much sicker.
After significant dehydration, stay cool, continue drinking fluids and follow the doctor’s instructions. Recovery periods vary, and returning too soon can set you up for another episode.
‘Pre-hydrate’ to Prevent Dehydration
How can you prevent dehydration? Start with “pre-hydration”! That means drinking water before you feel thirsty, especially if you are going to spend time in a warm environment. You’ll also want to bring enough water to continue drinking throughout the day. Build cooling breaks into the day, especially during long shifts, sports practices or time at the beach. Shade and air conditioning give the body a chance to release heat.
Review your medications before hot weather arrives. Some prescription and over-the-counter drugs can affect sweating, circulation, thirst or fluid balance. Ask a doctor or pharmacist about special precautions you should take. Do not stop taking your medication without a doctor’s guidance.
Pay attention to urine output, energy level and how your body feels. Your water needs vary based on your age and your body, so there is no set amount of daily hydration that is right for every person, but intense thirst, dark urine, fatigue and weakness are signs that you may be falling behind on your hydration.
Remember: Dehydration is easier to treat when you catch it early. When your body gives you warning signs, cool down and take a drink. Seek emergency care if your symptoms don’t improve—the quicker you get help, the sooner you can start feeling better.
Stay prepared: Find an emergency room near you. If you are experiencing an emergency, call 911.
