Pheochromocytoma can affect both men and women. They usually show up in the early 30s, 40s, or 50s. If someone in the family has this type of tumor, then you may have a higher risk of developing this tumor. This tumor does not occur due to environment diet or lifestyle. If you have this tumor, then think about doing genetic testing as 1 in 4 of these types of tumors are now believed to be run in families.