An excellent article dispelling some common myths with regards to chronic pain: http://mobile.abc.net.au/news/2016-08-16/myths-about-chronic-pain/7704554
“It is like a radio; if you turn up the volume, it does not mean the announcer is speaking louder, it just means that you are amplifying the sound.
Similarly, if the nervous system is sensitive, it is amplifying signals to the brain, which results in more pain — regardless of how much tissue damage there is.
We also know that things that fire together, wire together.
So if you often feel anxious when there is a twinge of pain during movement, then the areas of your brain that activate with movement, anxiety and pain all get very good at firing together.
This means that just movement or anxiety can activate this anxiety-pain-movement brain network. So you feel pain, without there actually being a danger signal from damaged tissue.”