Water is essential for nearly every system in the body

. It helps regulate temperature, support circulation, transport nutrients, remove waste, and keep organs functioning properly.

When you consistently lose more fluid than you replace, dehydration can develop. Mild dehydration may cause thirst, fatigue, dry mouth, and darker urine, while severe dehydration can become a medical emergency.

The signs are not always dramatic at first. Your body may send subtle signals that it needs more fluids long before dehydration becomes serious.

Here are some of the things that can happen when your body does not get enough fluids.

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1. Your Mouth and Lips May Become Dry

One of the earliest signs of dehydration can be dryness.

You may notice:

• A dry or sticky mouth

• Dry or cracked lips

• Increased thirst

• Less saliva than usual

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These symptoms can occur because the body has less fluid available for normal secretions.

However, dry mouth is not a perfect measure of hydration. Certain medications, mouth breathing, anxiety, and some medical conditions can also cause it.

2. Your Urine May Become Darker

Urine color can provide a useful clue about hydration.

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When you are adequately hydrated, urine is often pale yellow. When the body needs to conserve water, the kidneys produce less urine, and it can become more concentrated and darker.

You may notice:

• Dark yellow urine

• Stronger-smelling urine

• Urinating less frequently

These can be signs that you need more fluids.

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Still, urine color can also be affected by certain foods, vitamins, supplements, and medications, so it should not be viewed as a perfect test of hydration.

3. You May Feel Tired or Weak

Dehydration can make everyday activities feel more difficult.

You may feel:

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• Tired

• Weak

• Sluggish

• Less mentally alert

Fluid loss can affect circulation and the body’s ability to maintain normal functions, which may contribute to feelings of fatigue.

Fatigue by itself does not necessarily mean you are dehydrated. Poor sleep, stress, illness, medications, and many other conditions can produce similar symptoms.