The most obvious sign, but sometimes people don't feel thirsty until they're already mildly dehydrated.
When you're well-hydrated, your urine should be light yellow or pale straw-colored. Dark yellow or amber-colored urine is a sign that your body is conserving water.
Dehydration can lead to a dry mouth, cracked lips, or dry, flaky skin.
When dehydrated, your body struggles to circulate fluids and oxygen, which can make you feel tired, weak, or lightheaded.
Dehydration is a common trigger for tension or migraine headaches.
Dehydration can affect electrolyte balance, leading to muscle cramps or spasms, especially after physical activity.