The main hormone that people are very concerned about is estrogen. It is produced already in the body, but sometimes women will take more estrogen as medication in order to help regulate and control her reproductive system. There are other hormones that should not be taken or produced in high amounts, but they may not be dangerous.
They would just not make you feel well. Estrogen is considered to be a carcinogen which is something that causes cancer. Therefore, you would not want high levels of estrogen because you are increasing your chances of getting cancer. It should be monitored by a doctor if you are taking in estrogen medication. Otherwise, if your body is producing too high amounts of estrogen, then your doctor should know about it.