Since last night, I've had a mild sort of chest pain, in the top left bit of my chest, up towards the shoulder.
I often get this exact pain when I run, as a sort of stitch, so I know it's nothing sinister.
But now it hurts whenever I try to breathe in deeply. It's worse in some positions (e.g. if I lean back with my right shoulder), and my shoulders, between the shoulder bone and the neck, particularly on my back, are tender. So I'm thinking it's some sort of muscle problem. Has anyone had anything like this?
I'm a bit worried it's something up with my left lung. I have mild asthma, this isn't an asthma attack.