Hello,
What the doctor means to check is for phreochromocytoma. Pheochromocytoma is a neoplasm of the adrenal medulla. Only 10% of adrenal pheochromocytomas are malignant, while the rest are benign tumors.They may lead to potentially life-threatening high blood pressure, or cardiac arrythmias, and numerous symptoms such as headache, palpitations, anxiety attacks, sweating, weight loss, and tremor.