Calcific tendinitis is a shoulder condition in which calcium deposits form inside a tendon, most commonly within the rotator cuff. The supraspinatus tendon is often involved. This can lead to significant shoulder pain, pain during lifting, limited movement, and sometimes severe episodes that patients describe as unbearable.[1][2]
In my practice, I often see Bangladeshi patients who are surprised when imaging shows calcium in the tendon. Many ask whether the calcium came from food, milk, bone weakness, or “extra calcium” in the body. I usually explain that calcific tendinitis is not simply caused by eating calcium. It is a tendon problem, and the exact cause is not fully understood. What matters most is how much pain it is causing, how much the shoulder function is affected, and whether the condition is improving or continuing to interfere with daily life.[1][2]
For many people, the pain can be treated without surgery. But some patients have recurrent pain, stiffness, or major limitations, and those cases need closer evaluation and a more structured treatment plan.
What is calcific tendinitis?
Calcific tendinitis happens when calcium deposits build up in a tendon, usually one of the rotator cuff tendons.[1]
Where it most often occurs
The shoulder is the most common site, especially the supraspinatus tendon. Because the rotator cuff helps lift and stabilize the arm, inflammation around these deposits can make common activities very painful.[1][2]
Why does it happen?
The exact cause is not fully clear. Researchers believe tendon changes, local stress, and changes in tendon healing may contribute.[1][2]
Important point for patients
This problem is not usually caused by “too much calcium in the diet.” It is better understood as a tendon disorder rather than a nutritional overload problem.
Possible contributing factors
- tendon degeneration
- local tissue changes
- repetitive shoulder use
- reduced tendon health over time
- inflammation around the deposit
What symptoms does it cause?
Symptoms vary. Some patients have mild long-term discomfort. Others develop severe acute pain, especially during the resorptive phase when the body reacts strongly to the deposit.[1][2]
Common symptoms
- pain on the outer or upper shoulder
- pain while lifting the arm
- difficulty reaching overhead
- sudden severe pain episodes
- night pain
- reduced shoulder motion
- weakness due to pain
Many patients also feel they have general Shoulder Pain and Pain Around the Neck, which is why proper diagnosis is important.
Can calcific tendinitis be confused with other shoulder problems?
Yes, very easily.
Common conditions it may resemble
- rotator cuff tendinitis
- rotator cuff tear
- frozen shoulder
- bursitis
- impingement
- arthritis
This is one reason I do not recommend self-diagnosis when shoulder pain is persistent. A person may assume it is only a muscle strain when the tendon is actually inflamed because of calcium deposits.
How is the diagnosis made?
Diagnosis usually comes from the history, physical examination, and imaging.
Clinical assessment
When I examine a patient, I consider:
- the location of pain
- whether there was sudden severe onset
- whether arm elevation is limited
- whether night pain is present
- whether weakness is true weakness or pain-related guarding
- whether there are signs of another shoulder disorder
Imaging
X-rays
X-rays are often very useful because calcium deposits can often be seen clearly.[1]
Ultrasound
Ultrasound can help identify the deposit and may be useful in guiding certain procedures.[2]
MRI
MRI may be used when the diagnosis is unclear or when I need to assess associated tendon problems.
Does every case need surgery?
No. Many patients improve with non-surgical treatment.[1][2]
Non-surgical treatment may include
- rest from painful movements
- pain relief under proper medical guidance
- physiotherapy
- range-of-motion exercises
- gradual strengthening
- selected injections in some cases
- image-guided procedures in selected patients
AAOS notes that many people with calcific tendinitis improve with conservative treatment and do not require surgery.[1]
When is the pain so severe?
This is often the part patients find confusing. Sometimes the deposit is present quietly for some time, and then suddenly the shoulder becomes very painful.
