The kidneys play a vital role in maintaining the body’s fluid and electrolyte balance, filtering waste products and toxins from the blood, regulating blood pressure, and producing essential hormones. To perform these functions efficiently, the body requires an adequate intake of water. Dehydration is one of the most significant factors that can negatively affect kidney health and function. Dehydration occurs when the body loses more fluids than it takes in due to high temperatures, excessive sweating, diarrhea, vomiting, or insufficient water intake. As the body’s fluid level decreases, blood flow to the kidneys is reduced, limiting their ability to filter waste and maintain the body’s internal balance. If dehydration persists, it may lead to impaired kidney function and other health complications. Dehydration also increases the risk of developing kidney stones and urinary tract infections and may contribute to acute kidney injury, particularly among older adults, children, individuals with diabetes or hypertension, and patients with chronic kidney disease. Dehydration can be prevented by drinking adequate amounts of water each day, increasing fluid intake during hot weather or physical activity, consuming water-rich foods such as fruits and vegetables, and seeking medical attention if symptoms such as excessive thirst, reduced urination, dizziness, or dark-colored urine occur. Maintaining proper hydration is a fundamental step in preserving healthy kidney function and preventing many health problems. It contributes to overall well-being and quality of life while emphasizing the importance of adequate water consumption as part of a healthy and sustainable lifestyle. Prepared by: Ms. Tabarak Ahmed Turki Al-Mustaqbal University The First University in Iraq