Thirst is the most obvious and early sign of dehydration. When your body sense a decrese in fluid levels, it triggers the sensation of thirst to encourage you to drink more water.
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Dehydration can cause headaches or migraines. The exact mechanism isn't fully understood, but it's believed to involve the brain temporarily contracting form fluid loss leading to pain.
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When dehydrated, you might experience dizziness or lightheadedness, particular when standing up quickly.
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Dehydration can lead to dry or sticky feeling in the mouth and on the tongue. similarly, your skin may become dry, less elastic and may appear flaky.
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Dehydration can cause you to feel tired and lethargic. This occurs because your body's cells are not receiving the necessary amount of water to perform their functions efficiently.
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This can lead to a faster heartbeat and rapid breathing as the body tries to maintain oxygen levels.
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Severe dehydration can affect cognitive functions, irritability, and difficulty concentrating. this happens because the brain is highly sensitive to changes in hydration levels.