Dehydration - GCSE Biology Definition

Dehydration is a condition that happens when your body loses more water than it takes in. It means your body doesn't have enough water to carry out its normal functions. Water is essential for keeping your cells, tissues, and organs working properly. Without enough water, you might feel thirsty, dizzy, tired, or notice a dry mouth. Dehydration can occur due to not drinking enough fluids, especially during hot weather or when exercising, or from losing fluids too quickly through sweating, vomiting, or diarrhoea. It's important to drink plenty of water to stay hydrated and keep your body healthy.