Growth hormone deficiency is a medical condition where the body does not produce enough growth hormone, a vital hormone responsible 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. The causes of growth hormone deficiency can vary, including genetic factors, damage to the pituitary gland, or certain medical conditions. Diagnosis typically involves blood tests to measure hormone levels, and treatment often includes hormone replacement therapy to help manage symptoms and promote normal growth and development.