Growth hormone deficiency is a medical condition where the body does not produce enough growth hormone, a hormone crucial for growth and development. This deficiency can lead to various health issues, including stunted growth in children and changes in body composition in adults, such as increased fat and decreased muscle mass. Symptoms of growth hormone deficiency may include delayed growth in children, fatigue, and decreased bone density in adults. Diagnosis typically involves blood tests to measure hormone levels, and treatment often includes hormone replacement therapy to help manage the condition and improve quality of life.