According to my datebase diagnosis of shoulder tendinitis must rule out other causes of shoulder pain,such as myocardial infarction,cervical spondylosis,and tendon tear or rupture.
Significantly,in tendinitis,heat aggravates pain;in other painful joint disorders,heat usually provides relief.
Treatment to relieve pain includes resting the joint (by immobilization with a sling,splint,or cast),systemic analgesics,application of cold,ultrasound,or local inj
ection of an anesthetic and corticosteroids to reduce inflammation.
You have to visit orthopedic doctor becouse diagnosis and treatment is outside of trainers scope of practice.