If you're feeling out of sorts, you're tired, have trouble sleeping or you're taking anti- depressants, you could have a hormone imbalance.
Dr. Eldred Taylor is known as the hormone doctor, and says a regular thyroid test doesn't' give all the results you need. He also says some tests should be saliva tests, rather than blood tests.
In the interview below, Dr. Taylor looks at the five basic hormones and how they control your body.
You can find details about hormones on his website.
Photo credit: Dr. Eldred Taylor