Harm can dehydration bring depending on how much of your body weight is lost through fluids; dehydration can be described as mild, moderate or severe. The first sign of dehydration is thirst Dizziness, Headache, Tiredness, dry mouth, lips and eyes, dark yellow urine, lose strength and stamina, it can affect your kidney function and cause kidney stones to develop, liver, joint and muscle damage, cholesterol problems, Constipation dry, wrinkled skin that sags slowly into position when pinched up, an inability to urinate, or not passing urine for eight hours, irritability, sunken eyes, low blood pressure, a weak pulse, a rapid heartbeat, cool hands and feet, fits (seizures),a low level of consciousness, feeling lethargic or confused, blood in your stools or vomit, You can even die from severe dehydration because the blood stops circulating. It happens when your body loses more fluid than you take in. When the normal water content of your body is reduced, it upsets the balance of minerals (salts and sugar) in your body, which affects the way that it functions. Water makes up over two-thirds of the healthy human body. It lubricates the joints and eyes, aids digestion, flushes out waste and toxins and keeps skin healthy. If you’re dehydrated, drink plenty of fluids. This can be water, semi-skimmed milk and diluted squash or fruit juice.