Maybe you're getting stiff from being more sedate while you're sick? But yes, my pain stuff gets worse when I'm ill too. Maybe because of the stress? And tour body being inflamed with the illness? Also coughing (which I do a lot of with a URI) makes the pain SO MUCH worse. I usually get a pillow and apply counter pressure on my belly/back/wherever is hurting badly, when I need to sneeze/cough/etc.

I’m always in more pain when I’m sick. The common cold can completely wipe me out