Aside from starting too many threads? (Apologies, jekkyl!)
For the last week or so, the spot where my deltoid and bicep meet on my right arm, has been sore. Not so much that it has stopped me from doing anything other than chin-ups, mind you, but enough that, if I have to exert my arm with too much force, or I move it in the wrong way, I can feel it and it makes me wince.
On the way home today, I was accelerating quickly at a junction and so pulling hard on the handlebars, when it suddenly hurt quite a bit more and is now throbbing.
I have taken some ibuprofen now, but I am wondering what I did to it. I don’t remember injuring it in any way. Could I have pulled or torn a muscle without realising it more than a week ago?
To explain the pain/discomfort further, it feels a bit like the arm is dead and achy, but this is limited to the upper arm, close to where I described above.