Dehydration can be described as a

condition in which the body does not have enough fluids to function properly. This can be due to inadequate intake of fluids, excessive loss of fluids (such as from sweating, vomiting, or diarrhea), or a combination of both. Dehydration can lead to symptoms such as thirst, dry mouth, dark colored urine, fatigue, dizziness, and confusion. Severe dehydration can be life-threatening and requires immediate medical attention.