Last year my doctor ran a Vitamin D test on me and I was at an 8 which is really low. Once he put me on 1000 IU of Vitamin D a day the tendonitis disappeared within 2 weeks. I have suffered with it in my shoulders since 2004.
Without enough Vitamin D in your body, your body can't absorb calcium thus it is leached out into your joints causing tendonitis.
My shoulders are back to normal strength now and feeling great, its has been 7 months and not a sign of tendonitis yet. My orthopaedic ran x-rays and its gone.
Hello dear,
It is possible to get backache with quervain's tendonitis as the weight is transmitted to the spine.You should also see an orthopedic physician and get an x-ray done to rule out any pathology.
You should avoid lifting weights.
Best