What are the signs of dehydration?

Dehydration occurs when the body loses more fluids than it takes in. Common signs include thirst, dry mouth, dark urine, fatigue, dizziness, and reduced urine output. Severe dehydration can cause confusion, rapid heartbeat, low blood pressure, and fainting. Causes include excessive sweating, vomiting, diarrhea, or inadequate fluid intake. The body relies on water for temperature regulation, nutrient transport, and organ function. To prevent dehydration, drink fluids regularly, especially in hot weather or during exercise. Electrolyte-rich beverages are helpful during heavy fluid loss.