How should i treat a torn shoulder muscle?

See an ortho doc: A "torn shoulder muscle" most commonly refers to a rotator cuff tear. Some patients will have rotator cuff tears that are amenable to initial non-operative management while others will require more aggressive treatment to lessen the risk of long-term shoulder dysfunction. An orthopedic surgeon with an expertise in shoulders, after an office evaluation, can best advise you.

Multiple Options: Assuming you mean you have a tear of your rotator cuff a well designed scapular stabilization and shoulder strengthening program without further stressing the injury may be helpful. http://www.theshouldercenter.com/rotator-cuff-tear.htm the two most common reasons patients choose surgical treatment are persistent weakness and pain (especially night pain).