In this video, a St John Ambulance trainer explains the signs of dehydration, and how to help someone who is suffering from dehydration. Dehydration happens when someone loses more fluid than they take in. Young children and older people are likely to get dehydrated more easily, so it’s especially important for them to drink plenty of water. Find out more about dehydration: Learn more life saving skills with St John Ambulance first aid training courses: For more information follow us on Twitter or Facebook #FirstAid #HowTo #Dehydration