Pheochromocytoma is a rare tumor that usually develops in the adrenal glands, which are located on top of each kidney. This tumor produces excess hormones called catecholamines, leading to symptoms such as high blood pressure, rapid heart rate, and anxiety. Diagnosis often involves blood and urine tests to measure hormone levels, along with imaging studies like CT scans or MRI to locate the tumor. Treatment typically includes surgical removal of the tumor, which can help alleviate symptoms and prevent complications related to high blood pressure.