Frozen Shoulder therapy is often centered on pain relief (see below excerpt from Noël E et al). Pain relief is the main objective of therapy. Oral medications have not been adequately evaluated, with the exception of glucocorticoids, which hasten the resolution of nighttime pain to a modest degree....Motion range recovery is not always complete after 18 to 24 months and can be improved by physiotherapy. Methodological difficulties have precluded demonstration in formal studies of the undeniable benefits of physiotherapy. I find that you can get a lot of pain relief from some good soft tissue work (a.k.a. Poor Man's Massage). That is the basis of my almost famous frozen shoulder tennis ball trick.