Thword 'spasm' would explaine the symptoms, or more the aching you get after a bad spasm. And I was ruuning with my weight slightly forward so you may have hit the nail on the head.
How long would you suggest I keep off running temporary.
I am suffering from pain in my middle back on one side just 5" below the bottom of my shoulder blade.
It feels very much like a pulled muscle and it appeared the day after a 45 minute run, (I only normally run 30 mins at a time). This has now happened twice.
Is this something to do with how I hold my arms? Is this normal?