dehydraation

Dehydration is a condition that occurs when the body loses more fluids than it takes in, leading to a deficit of total body water and an electrolyte imbalance that impairs normal function. The standard spelling is dehydration; dehydraation is a common misspelling.

Causes include inadequate fluid intake, vomiting, diarrhea, heavy sweating, fever, diuretic use, and certain illnesses such as diabetes or kidney disease. Infants, young children, older adults, and people in hot climates or engaging in strenuous exercise are at higher risk.

Dehydration can be categorized by the relative loss of electrolytes to water: isotonic dehydration involves proportional loss, hypotonic dehydration involves more electrolytes lost relative to water, and hypertonic dehydration involves more water loss relative to electrolytes. Clinically, dehydration is described as mild, moderate, or severe to guide treatment.

Common signs and symptoms start with thirst, dry mouth, and reduced urine output. As it progresses, skin may become dry, eyes may appear sunken, and fatigue or dizziness may occur. In severe dehydration, confusion or lethargy, rapid pulse, low blood pressure, fainting, and reduced urine output can develop, potentially leading to shock.

Diagnosis relies on medical history and physical examination, observation of urine color, and vital signs. Laboratory tests may include serum electrolytes, bicarbonate, and blood urea nitrogen; plasma osmolality may be measured in uncertain cases or severe illness.

Treatment emphasizes restoration of fluid balance. Mild to moderate dehydration is typically treated with oral rehydration solutions that replace water and electrolytes. Severe dehydration requires prompt intravenous fluids and treatment of the underlying cause. Prevention focuses on regular fluid intake, especially during heat or illness, prompt rehydration after illnesses, and careful use of diuretics when appropriate.