Pheochromocytoma is a tumor. It is made up of special adrenal gland cells. These cells secrete hormones such as epinephrine and norepinephrine. These hormones help to regulate the heart rate and blood pressure. The cells may secrete excessive amounts of the hormones. This results in periods of:
- Very high blood pressure
- Rapid heart beats or palpitations
- Excess sweating
- Severe headaches
Most of these tumors are benign (noncancerous). About 10% are malignant (cancerous). Most of the tumors grow on the adrenal glands. The glands are on top of the kidneys. About 10%-20% the tumors occur elsewhere in the body.
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