what does shoulder pain have to do with rut?

When you're in a rut, your entire body tends to ache and feel overheated. During fever or illness, aches typically start in the shoulders, back, and legs because these areas bear the most strain or being heavily used for posture and movement. I kinda learned this in our anatomy class. Hehe

Idk. But shoulder pain most of the time associate with heart attacks. Since, he's in a rut his heart beats faster and pain radiate to the upper back, shoulder blades.