What are hormonal cascades?

Hormonal cascades are like signals that help your body do big things by starting small messages that grow bigger and bigger.

Imagine you're playing with a toy telephone. You whisper a secret into it, and the next person hears it louder. Then they pass it on even louder, until the whole class is shouting the same secret. That’s kind of like what happens in your body when hormones start a chain reaction, a hormonal cascade.

At first, one hormone might be released by a gland, like the pituitary gland in your brain. This hormone travels through your blood and tells another gland to release its own hormone. That second hormone then goes on to tell more parts of your body what to do. It’s like passing a message from friend to friend until it reaches the whole group.

Think about when you're cold. Your brain sends out a signal, which tells your thyroid to make more hormones that help warm up your body. Then, those hormones tell other parts of your body to start working harder, like turning on heaters in every room of the house!