Cushing's disease is a hormonal disorder caused by an excess of cortisol, a hormone produced by the adrenal glands. This condition often results from a tumor in the pituitary gland, which stimulates the adrenal glands to produce more cortisol than the body needs. Symptoms may include weight gain, high blood pressure, and changes in mood. Diagnosis typically involves blood tests, urine tests, and imaging studies to identify the source of excess cortisol. Treatment options may include surgery to remove the tumor, radiation therapy, or medications to control cortisol production. Early diagnosis and management are crucial for improving outcomes.