Could i have had shoulder tendonitis sometimes, sometimes not, for 11 months?

Yes: Shoulder tendinitis sometimes reflects the relative function of the rotator cuff muscles and the shoulder blade muscles. You can certainly have well functioning shoulders off and on. Shoulder pain can also come from neck problems where the nerves are irritated. That can also come and go on its own.

Yes: Shoulder tendinosis and bursitis commonly come and go over time, even years. If you have recurrent problems with the shoulder seeing a shoulder surgeon is a good idea to ensure that you do not have something more serious such as a rotator cuff tear that may get worse over time.

Yes: Tendinitis can come and go based on level of activity and type of activity. This is common. You may actually have a partial tear of your rotator cuff which leads to these recurrent bouts of pain.

Many Possibilities: Prolotherapy typically by itself will cause ligaments to tighten up, usually due to scarring or fibrosis of the ligaments. However now prolotherapy is used to introduce new blood supply to the area and then many times following it with the prp and/or stem cells in the area can repair the tissue/ligaments by the hopes that the stem cells regenerate the same normal tissue type. Regenexx.Com