Long history with tendonitis. wrists, elbows, shoulders, hip, and ankles affected. calcified in both rotator cuffs. can there be a global cause?

Possibly endocrine: Calcific Tendonitis of the shoulders is more typically seen in a person > 50 years old. Under the age of 50 I would consider checking for a condition called hyperparathyroidism by checking a blood calcium level. In addition, certain kidney conditions are associated with Calcific Tendonitis but usually the person is on dialysis due to kidney failure.

Tendinitis: Tendinitis and bursitis are conditions known as soft tissue rheumatic syndrome. Conditions, related to tendinitis or bursitis could be: overuse or injury of the joints, rheumatoid arthritis,thyroid disease, gout, kidney diseases. Sometimes, statins and fluoroquinolone antibiotics can cause tendinitis or tendon rupture.