I once had a similar experience, except it was the muscles in my back, between my shoulder blades, that were causing great pain. I eventually realized that 1)

I once had a similar experience, except it was the muscles in my back, between my shoulder blades, that were causing great pain. I eventually realized that 1) the issue was due to long hours of keyboard work, and 2) when I added seated cable rows to my lifting routine, the pain went away completely.