Adrenaline’s great for powering a sprint to safety across the savannah, and it can certainly bring energy and excitement to your stage presence. But too much of it is a bad thing. It can dry up your mouth and tighten your throat. Its job is to turbo-charge your muscles, and if your muscles are not being used, the adrenaline rush may start them twitching, hence the shaking associated with extreme cases of nerves.
