Water is essential for nearly every system in the body

Confusion, loss of consciousness, or a very high body temperature can indicate a medical emergency.

Who Is More Vulnerable to Dehydration?

Anyone can become dehydrated, but certain people are at greater risk.

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These include:

• Older adults

• Infants and young children

• People exercising or working in hot environments

• People with fever

• People experiencing vomiting or diarrhea

• People taking medications that increase fluid loss

• People with certain medical conditions affecting fluid balance

Older adults may be particularly vulnerable because the sensation of thirst can become less noticeable with age.

That’s why waiting until you feel extremely thirsty is not always the best strategy.

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How Much Water Do You Actually Need?

There is no single amount of water that every person needs each day.

Fluid requirements vary according to body size, activity level, climate, diet, age, pregnancy, illness, medications, and other factors.

Water is not the only source of fluid. Other beverages and water-rich foods can contribute to your overall fluid intake as well.

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A practical approach is to drink regularly throughout the day and pay attention to signs such as thirst and unusually concentrated urine.

People with certain heart, kidney, or liver conditions may have specific fluid restrictions, so they should follow their healthcare professional’s recommendations rather than deliberately increasing water intake.

Don’t Wait for Severe Dehydration

Mild dehydration can often be addressed by replacing lost fluids, especially when it results from everyday activities, heat, or exercise.

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But severe dehydration can become dangerous.

Seek urgent medical attention if dehydration is accompanied by:

• Fainting

• Severe confusion

• Extreme weakness

• Very little or no urination

• Rapid breathing

• A very fast heartbeat

• Inability to keep fluids down

• Severe vomiting or diarrhea

• Signs of shock or loss of consciousness

For someone who is severely ill, confused, unconscious, or unable to swallow safely, do not force them to drink. Emergency medical care may be necessary.

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The Bottom Line

Your body depends on water every day, and dehydration can affect much more than thirst.