Based on my super scientific Googling of "shoulder blade pain swimming", I think I might have swimmer's shoulder. The truth is, my right shoulder sort of hurts most of the time. I carry all of my tension in my right shoulder, which is exacerbated by my decidedly non-ergonomic office set-up.
(I actually have a good office chair, but crossing my legs under myself like a pretzel while I type probably isn't allowing the chair to live up to its full potential.)
Anyway, this is different than my normal shoulder pain and rather than being located in my lat up near my neck, like usual, the pain is more in my shoulder blade. Or rather deep down and right above my shoulder blade.
During my Masters swim on Tuesday it became more than just a nuisance, but I pushed through and did the workout. Yesterday, I wound up mostly kicking because every time I swam more than a 100, my shoulder started yelling at me. Today was supposed to be my 4th swim of Week 6, but instead, I woke up with a stiff and achey shoulder and decided to just let it go. It's not worth it to do further damage and wind up not being able to swim for a longer period of time.
The causes of swimmer's shoulder are overuse (duh) and crossing your arm over the center of your body during your pull. That second cause is exactly what I've been working on correcting over the last few weeks, but apparently not quickly enough.
We're going hiking and camping this weekend, so I know I'll more than make up for that 4th swim in terms of getting in a workout. I won't be back in the pool until Tuesday and my fingers are crossed that taking 5 days off will help.