Calcific tendinitis is a build-up of calcium in one of the shoulder tendons, and it can range from a low-grade ache to a sudden, severe pain that makes the shoulder almost unusable. It behaves differently from most shoulder tendon problems, and the encouraging part is that in many people it settles on its own over time. Here is what it is, why it happens, and what helps move it along.
What calcific tendinitis is
Calcific tendinitis, known clinically as calcific tendinopathy, is the deposition of calcium crystals within the rotator cuff tendons of the shoulder, most often the supraspinatus. It affects an estimated three to ten percent of adults, more often women, usually between the ages of about 30 and 60, and it is more common in people with diabetes or an underactive thyroid.
It is worth understanding how it differs from the other tendon problems we treat. Most of those are driven by overload and a failure of the tendon to keep up with the demands placed on it. Calcific tendinitis is different: the main process is the active laying down and then the clearing away of a calcium deposit, which the body often resolves by itself. That is why the treatment is aimed at the deposit and the pain, rather than at rebuilding load capacity.
What it feels like
How it feels depends on what stage the deposit is in. While the calcium is being laid down and sitting quietly, it may cause only a low-grade ache, often the pattern of a typical shoulder impingement, with pain on reaching and overhead activity and at night when lying on the shoulder. When the body starts to clear the deposit, the deposit becomes soft and unstable, and this is when the pain can escalate suddenly to a severe, sometimes disabling level with a marked loss of movement, occasionally described as an acute calcific crisis. In some people the shoulder can stiffen up in a frozen-shoulder-like pattern.
Why it happens
Unlike the load-driven tendon problems, everyday overload and sport are weaker factors here. The recognised contributors are mostly to do with the body's metabolism and tissue environment:
- Being female and in middle age, the most common group affected
- Diabetes and thyroid disorders, which are recognised associations
- A familial or genetic tendency in some cases
- A poorly supplied, low-oxygen area within the tendon, which is thought to trigger the change that leads to calcium being laid down
How it is diagnosed
A plain X-ray is the main tool and readily shows the deposit. Its appearance also helps work out which stage it is in: a dense, well-defined deposit suggests it is in the laying-down or resting phase, while a fluffy, ill-defined deposit suggests the body is actively clearing it. An ultrasound is useful for confirming the deposit, judging how soft it is, guiding treatment, and spotting whether any of it has moved into the surrounding tissue. An MRI is occasionally needed, though a deposit can look more alarming than it is on an MRI, which is a recognised pitfall.
What else shoulder pain can be
Calcific tendinitis sits among the common causes of shoulder pain and can overlap with them, including rotator cuff tendinopathy and tears, impingement, and frozen shoulder. The features that matter most arise during a severe clearing-out flare, when the intensity of the pain can resemble a joint infection, and when the imaging can occasionally mimic more serious processes. This is why an accurate diagnosis, anchored by imaging, comes first.
How calcific shoulder is treated
Because the condition so often settles by itself, the first-line approach is conservative, and treatment is matched to the stage the deposit is in.
Settling the pain and keeping it moving
First-line care is pain relief, easing off the activities that aggravate it, and a rehabilitation programme to keep the shoulder moving and the rotator cuff working. During a severe clearing-out flare, anti-inflammatory medication and, where needed, a corticosteroid injection into the shoulder can settle the worst of the pain while the episode passes.
Clearing the deposit
Where the deposit is suitable, particularly when it is in the soft, resorbing phase, an ultrasound-guided procedure called barbotage, which needles and flushes the deposit, is an effective option and is often combined with a corticosteroid injection. Matching the treatment to the phase matters, because a softening deposit responds differently from a dense, quiet one.
Where shockwave therapy fits
Shockwave therapy is one of the better-supported active treatments for calcific shoulder, working by helping to break down and reabsorb the deposit while easing pain. It is worth being straight about the detail here: high-energy focused shockwave generally performs best for this particular problem, and radial shockwave, the type used here, is also well supported, with individualised protocols reporting high success and low recurrence. The deepest and densest deposits are the ones where a focused device has the advantage. After assessment, this is something to discuss honestly so you end up with the approach best suited to your deposit. You can read more about how shockwave therapy works and the conditions it suits.
Warning signs to watch for
- A sudden, very severe shoulder pain with marked loss of movement, which can be an acute clearing-out flare, not harmful in itself but worth assessing so it can be settled effectively
- Shoulder pain with fever, feeling unwell, or a hot, red, swollen joint, which needs urgent review to exclude infection, since a severe flare can resemble a joint infection
- Numbness, pins and needles, or weakness extending down the arm, which suggests a nerve or neck contribution rather than the deposit alone
- Progressive weakness or an inability to lift the arm, which can indicate a significant rotator cuff problem
- Shoulder pain that is constant, unrelated to movement, present at rest and at night over a sustained period, or accompanied by unexplained weight loss, which should always be checked
What to expect from treatment
The outlook is generally good, and many deposits clear on their own over time, with the pain settling as they go. The frustrating part is that the timescale is unpredictable and can stretch over months to years, and some people have ongoing pain or a recurrence. Matching the treatment to the phase of the deposit improves the odds, which is why an accurate picture from imaging guides the plan rather than a one-size-fits-all approach.
Common questions
Will the calcium go away on its own?
Often, yes. Many deposits are cleared by the body over time and the pain settles with them. The timescale is unpredictable, though, and treatment can help move things along or settle a severe flare.
Why is the pain suddenly so much worse?
A sudden escalation usually means the body has started to clear the deposit, which becomes soft and unstable during that phase. It is the most painful stage, but it is also a sign the deposit is on its way out.
Is this caused by something I did?
Probably not in the way load-related tendon problems are. Everyday use and sport play a smaller role here. It is more closely linked to age, sex and metabolic factors such as diabetes and thyroid problems.
Is shockwave therapy worth it for calcific shoulder?
It is one of the better-supported active treatments and can help break down the deposit. For the deepest, densest deposits a focused device has an advantage, so the right approach is worth discussing after your shoulder has been assessed and imaged.
If shoulder pain is disturbing your sleep or limiting your movement, or it has flared suddenly and severely, it is worth having it properly assessed and imaged so the right plan can be put in place. Book a visit and we will work out what is driving it and how to settle it.
