My shoulder starting hurting 3 months ago after doing some home improvements. Now, I can't sleep.
Could something be torn?
It's possible, but the more common issue is inflammation of the muscles, called tendinitis. Tendinitis can affect the small muscles around your shoulder, which we refer to as the rotator cuff muscles.
Is there a way to check for a tear?
A thorough physical examination is the best first step to diagnose tendinitis versus a tear of the rotator cuff. If it is difficult to tell for sure, then an MRI is a way to look at the muscles to see if there is a tear.