Dehydration in Older Adults: Warning Signs, Prevention, and When to Seek Care

Staying hydrated is one of the most important things you can do for your health, especially as you get older. Water helps your body regulate temperature, protect your joints, aid digestion, and remove waste. But many adults over age 60 are at a higher risk for dehydration because the body's sense of thirst naturally decreases with age. In fact, research shows that many older adults do not drink enough fluids each day and may not realize they are dehydrated until symptoms begin to appear.

While a hot summer day can certainly increase your risk, dehydration can happen any time of the year. Illness, certain medications, and even everyday activities can cause your body to lose more fluid than it takes in.

Warning Signs of Dehydration

Dehydration happens when your body loses more fluids than it replaces. The symptoms may start out mild but can become serious if left untreated.

Common warning signs include:

• Dry mouth or dry tongue
• Dark yellow urine
• Needing to urinate less often
• Fatigue or low energy
• Dizziness or feeling lightheaded
• Headaches
• Muscle cramps
• Confusion or trouble concentrating

For older adults, dehydration can be especially concerning because it may increase the risk of falls, kidney problems, constipation, and hospital visits.

It's Not Just the Heat

Most people connect dehydration with hot weather, but there are many other causes.

You may become dehydrated from:

• Fever, vomiting, or diarrhea
• Physical activity or heavy sweating
• Not drinking enough fluids during the day
• Certain chronic health conditions, such as diabetes or kidney disease

Another common cause is medication use.

Can Your Medications Make You Dehydrated?

Yes. Some medications can increase fluid loss or make it harder for your body to stay hydrated.

Examples include:

• Diuretics (often called "water pills")
• Some blood pressure medications
• Certain diabetes medications
• Laxatives
• Medications that increase urination or sweating

The Centers for Disease Control and Prevention (CDC) warns that some medications can raise the risk of dehydration and overheating, especially during warmer months.

If you take prescription medications and notice signs of dehydration, talk with your primary care provider. Never stop taking a medication without medical guidance.

When Dehydration Becomes Serious

Mild dehydration can often be treated by drinking more fluids, but severe dehydration requires medical attention. Older adults can become dehydrated more quickly than they may realize, especially when illness, medications, or hot weather are involved. Research shows that dehydration can increase the risk of kidney problems, falls, confusion, hospitalization, and other serious health complications in older adults.

Signs of Severe Dehydration

Contact your healthcare provider right away if you experience:

• Extreme thirst that does not improve after drinking fluids
• Very dark urine or little to no urine output
• Severe dizziness or difficulty standing
• Rapid heartbeat
• Confusion, unusual sleepiness, or trouble focusing
• Inability to keep fluids down because of vomiting or illness

Talk to Your Primary Care Provider

If you notice signs of worsening dehydration, don't wait for symptoms to become severe. For members of ArchWell Health, contact your local center as soon as possible for a same-day appointment to help identify the cause of dehydration and provide treatment before the condition worsens.

Your provider can:

• Review medications that may be contributing to dehydration
• Check for underlying illnesses
• Assess your hydration status
• Recommend the best treatment plan for your needs

How to Rehydrate

The good news is that mild dehydration can often be corrected by replacing lost fluids.

A few simple ways to rehydrate:

• Drink water throughout the day, even if you are not thirsty.
• Increase fluid intake during hot weather or when you are sick.
• Choose low-sugar drinks when possible.
• Enjoy broth-based soups for added fluids.
• Carry a reusable water bottle to encourage regular drinking.

A good tip is to check the color of your urine. Pale yellow usually means you are getting enough fluids, while darker urine may be a sign that you need to drink more.

What About Electrolytes?

When most people think of hydration, they think about drinking water. While water is essential, your body also needs electrolytes—minerals such as sodium, potassium, and magnesium—to help balance fluids and support normal muscle and nerve function.

Electrolytes can be lost through:

• Excessive sweating
• Vomiting or diarrhea
• Fever or illness
• Certain medications that increase fluid loss

For everyday hydration, water is usually the best choice. However, if you have been sick, spending extended time in the heat, or experiencing significant fluid loss, drinks that contain electrolytes may help replace what your body has lost.

Keep in mind that some sports drinks can contain high amounts of sugar or sodium. If you have high blood pressure, heart disease, kidney disease, or other chronic conditions, talk with your healthcare provider about the best hydration options for you.

IV Fluids May Be an Option

When dehydration is moderate to severe, or when someone cannot drink enough fluids on their own, intravenous (IV) fluids may be recommended. IV hydration delivers fluids directly into the bloodstream, allowing the body to replace lost fluids more quickly. Oral hydration is usually the first treatment for mild dehydration, but IV fluids can be helpful when symptoms are more serious or when illness makes it difficult to drink enough fluids.

Seeking care early can help prevent complications and may reduce the need for an emergency room visit.

Don't Forget to "Eat Your Water"

Water doesn't only come from your glass. Many fruits and vegetables are packed with water and can help support hydration.

Some examples include:

• Watermelon
• Strawberries
• Cantaloupe
• Cucumbers
• Tomatoes
• Lettuce
• Celery

The CDC notes that foods with high water content contribute to your daily fluid intake. Check out our blog on Eating Your Water to learn more about hydrating foods that can help you stay refreshed.

Tips to Prevent Dehydration

A few small habits can make a big difference:

• Drink water with every meal.
• Keep a water bottle nearby.
• Set reminders on your phone or smart watch.
• Drink extra fluids when active or spending time outdoors.
• Include water-rich fruits and vegetables in your meals.
• Ask your healthcare provider if any of your medications may affect hydration.

The Bottom Line

Dehydration is common among older adults, but it is often preventable. Knowing the warning signs, understanding how medications can affect hydration, and building healthy hydration habits can help protect your overall health. While dehydration can happen to anyone, it doesn't have to slow you down. If you're concerned about your hydration or begin noticing symptoms, reach out to your provider. By staying mindful of your fluid intake and seeking care when needed, you can continue to enjoy an active, healthy lifestyle all year long.