Shoulder pain: impingement, calcific shoulder or osteoarthritis?

At a glance

  • The shoulder is the most mobile joint in the body and therefore vulnerable. Behind shoulder pain there are often three main causes: impingement, a calcific shoulder or osteoarthritis.
  • The type of symptoms helps to tell them apart: pain when lifting overhead points to impingement, intense nighttime attacks to a calcific shoulder, gradual stiffness to osteoarthritis.
  • Simple self-tests such as the painful arc or reaching behind the back give first clues but do not replace a diagnosis.
  • Most of it can be treated conservatively: physiotherapy, targeted exercises, pain relief and, for a calcific shoulder, shockwave therapy. Surgery is rarely needed.
  • Get checked immediately: shoulder pain after a fall with deformity, a hot swollen joint with fever, or shoulder pain with chest pressure and shortness of breath.

Shoulder pain is one of the most common reasons people visit an orthopaedic practice. No wonder, because the shoulder is the most mobile joint in the body, a finely tuned interplay of upper arm head, shoulder blade, collarbone, tendons, muscles and bursae. This mobility also makes it vulnerable. Instead of presenting you with a confusing hodgepodge of possible diagnoses, this guide helps you tell apart the three most common causes, classify your symptoms with simple self-tests and find the right treatment path.

The good news first: most shoulder pain is not dangerous and can be treated well without surgery. The key is to know the cause, because the right approach depends on it.

The three most common causes compared

Impingement, a calcific shoulder and shoulder osteoarthritis are often confused because they can feel similar. The overview below compares them. It does not replace a diagnosis, but it helps you classify your symptoms better.

Feature Impingement Calcific shoulder Shoulder osteoarthritis
What happens Tendon and bursa are pinched under the shoulder roof Calcium is deposited in the tendon, usually the supraspinatus tendon The joint cartilage wears down, the bones rub against each other
Typical pain When lifting the arm to the side and overhead, painful arc Often sudden and very intense, also at night, in flare-ups Gradual, start-up pain at first, later also at rest
Mobility Painfully restricted with certain movements Heavily restricted during an acute flare Decreases slowly and permanently
Who is affected Often with overhead work or sport, middle age Middle age, somewhat more often women Rather older age or after injuries
Special feature Most common cause of shoulder pain Can resolve on its own, shockwave helps Cartilage has no pain sensors, so often felt late

Besides these three there are further causes that produce similar symptoms: frozen shoulder with increasing stiffness and pain, a rotator cuff tear with loss of strength, irritation of the long biceps tendon with front shoulder pain or problems in the AC joint right on top of the shoulder. These can also be well distinguished medically.

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The causes in detail

If you want to know more precisely, here are the key features of the most common triggers, precise rather than general.

Impingement (shoulder narrowing)

With impingement, the space under the bony shoulder roof becomes too narrow, so that the supraspinatus tendon and the bursa below it are pinched during certain movements. Typical is pain when lifting to the side and overhead, often with the painful arc. Especially affected are people who work a lot overhead or do sport with throwing and overhead movements. The treatment is usually conservative, with physiotherapy as the most important building block.

Calcific shoulder (calcific tendinitis)

With a calcific shoulder, calcium is deposited in a shoulder tendon, in around four out of five cases in the supraspinatus tendon. This runs in phases: for a long time it can stay quiet, then comes an often very intense, also nighttime pain flare. The good news is that the calcium frequently dissolves again on its own. If that does not help, shockwave therapy, a needling with aspiration of the calcium or a corticosteroid injection are proven options.

Shoulder osteoarthritis

With shoulder osteoarthritis, the joint cartilage wears down. It is rarer than knee or hip osteoarthritis and often develops after injuries, instability or a long-standing impingement. Because cartilage has no pain sensors, the osteoarthritis is often felt only late. Typical are start-up pain after rest, a slowly decreasing mobility and later also pain at rest. Reaching behind the back becomes increasingly difficult.

Frozen shoulder

With a frozen shoulder, the joint capsule thickens and becomes inflamed, making the shoulder increasingly stiff and painful. It typically runs in three phases, from the painful freezing through the stiff phase to the gradual thawing, which together can take many months. People with diabetes, among others, have a higher risk. It is important to keep the shoulder gently moving and to be patient.

Self-tests: first clues for at home

With a few simple movements you get a feeling for where the symptoms might come from. Important: these tests are only a guide and do not replace a medical examination. Do them slowly and only as far as the pain allows.

  • Painful arc: Slowly raise the straight arm to the side. If the pain appears at mid height, roughly between 60 and 120 degrees, and eases off again right at the top, that points to impingement. Pain only at the very end of the movement points more to the AC joint.
  • Reaching behind the back and neck: Try to reach up between the shoulder blades with your hand behind your back, and with your hand to the back of your neck. If this is clearly difficult or painful, a frozen shoulder or osteoarthritis can be behind it.
  • Strength test: Hold the arm raised to the side and push gently against resistance. If pain and weakness clearly give way, the rotator cuff may be irritated or damaged.

Note which movements hurt and when. This later helps the medical practice to narrow down the cause more quickly.

Warning signs: when not to wait

Act immediately if

a sudden pain especially in the left shoulder or arm occurs together with pressure or tightness in the chest, shortness of breath, nausea or cold sweat. This can be a heart attack and is an emergency, call emergency services. You should also have a shoulder deformed after a fall, the inability to lift the arm, a hot, red and swollen joint with fever and shoulder pain with numbness or weakness in the arm medically assessed.

These warning signs are rare but important. In the vast majority of cases shoulder pain is harmless and treatable. With persistent or recurring symptoms, an orthopaedic assessment is still worthwhile.

The treatment path: step by step instead of a hodgepodge

For most shoulder pain the treatment follows a clear stepwise plan, from the simple to the more involved. This way you avoid unnecessary procedures and give the body the chance to heal on its own.

How the doctor finds the cause

It starts with the conversation and simple movement and strength tests, which already reveal a lot. To confirm, imaging methods help that complement each other well: ultrasound shows tendons, bursae and calcium deposits without radiation. X-ray shows the bones, calcium deposits and signs of osteoarthritis. MRI provides the most precise images of tendons, tears and the joint capsule. With this, impingement, a calcific shoulder and osteoarthritis can be reliably distinguished, which is the basis for the right, targeted treatment.

Which examination is needed is decided by the medical practice depending on the findings.

  • Step 1, calm the acute phase: Temporarily reduce aggravating movements, but do not fully immobilise the arm. With acute, inflammatory pain, cool and, if needed, take an anti-inflammatory painkiller.
  • Step 2, keep mobility: Start early with gentle pendulum and mobility exercises so the shoulder does not stiffen. An impending frozen shoulder in particular is something you want to avoid.
  • Step 3, build up specifically: In physiotherapy strengthen the rotator cuff and shoulder blade muscles and improve posture. This is the most important lever for impingement and many other causes.
  • Step 4, targeted procedures: If that is not enough, depending on the cause, shockwave therapy for a calcific shoulder, needling of the calcium deposit or a corticosteroid injection are options. Imaging such as ultrasound, X-ray or MRI clarifies the details.
  • Step 5, surgery as the exception: Only when conservative treatment over months is not enough or there is a clear structural damage is a procedure considered.

Which step makes sense for you depends on the exact cause and is decided in the medical practice. The order matters: first calm and move, then build up, then targeted procedures.

When wear or rheumatism is behind it

If shoulder osteoarthritis is behind the symptoms, the same principles apply as for other joints: movement, targeted muscle building and pain relief keep the joint functional as long as possible, complemented by injections and, in severe cases, an artificial joint. Read more in our article on osteoarthritis.

Sometimes shoulder pain is part of an inflammatory rheumatic condition that affects several joints. Clues are morning stiffness over a longer time, swelling in several joints or a general feeling of illness. Then a rheumatology assessment makes sense. Read more in our article on rheumatism. How shoulder pain fits into the bigger picture of joint pain is shown in the corresponding article.

Painkillers and heat or cold

Painkillers can bridge a painful phase so that you become mobile again. For inflammatory shoulder pain an anti-inflammatory such as ibuprofen or diclofenac often works well, short and at a low dose. On the question of heat or cold, a closer look pays off: in the acute, inflammatory phase, for example with a calcific shoulder, cooling is usually more comfortable, while heat can intensify an acute inflammation. With chronic, tension-related symptoms without acute inflammation, on the other hand, many find heat soothing. Anyone who regularly takes other medications, is pregnant or has pre-existing conditions should discuss the choice with a doctor or pharmacy. Read more on effect and caution on our page about ibuprofen.

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How to prevent shoulder pain

A lot can be prevented by keeping the shoulder strong and mobile. Regularly include exercises for the rotator cuff and the shoulder blade muscles, as a stable muscle system guides the upper arm head cleanly and relieves the tendons. Pay attention to an upright posture, especially with a lot of desk work, and avoid a constantly forward-pulled shoulder profile. Anyone who works or trains a lot overhead should dose the load, warm up well and increase volume slowly. Regular movement breaks loosen the shoulders and prevent tension.

There is also a lot you can do in everyday life. Carry heavy bags close to the body and switch sides rather than carrying on one side. Set up your workplace so that the forearms rest relaxed and the shoulders are not constantly pulled up. Anyone who suffers from shoulder pain at night should avoid lying on the affected side and can place a pillow under the arm for support. These small adjustments noticeably relieve the shoulder and support every other measure. Acting early often prevents a harmless irritation from turning into a stubborn, chronic problem.

The bottom line: shoulder pain can usually be treated well if you know the cause and follow the treatment path instead of randomly trying different remedies. Keep mobility, build up specifically and do not hesitate with warning signs, that is the common thread through almost every form of shoulder pain. With some patience, most people get rid of their shoulder pain again. And if the symptoms do not ease despite all self-help or one of the warning signs appears, a medical assessment is the safest way to quickly reach the right treatment and avoid follow-on damage.

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Frequently asked questions about shoulder pain

With impingement, raising the arm to the side and overhead mainly hurts, often with a painful arc at mid height. A calcific shoulder often shows up with very intense, sometimes nighttime pain attacks and is caused by calcium deposits in the tendon. The two are similar but can be distinguished with ultrasound or X-ray. The medical examination brings certainty.
With the painful arc you slowly raise the straight arm to the side. If the pain appears at mid height, roughly between 60 and 120 degrees, that points to impingement under the shoulder roof. Pain only right at the top points more to the AC joint. The test is a clue, not a diagnosis.
A calcific shoulder often disappears on its own but can be very painful. In the acute phase painkillers and cooling help. If that is not enough, shockwave therapy, a targeted needling with aspiration of the calcium or a corticosteroid injection are options. Surgery is rarely needed. Physiotherapy supports mobility.
Nighttime shoulder pain is typical of impingement and a calcific shoulder. When lying down, especially on the affected side, the pressure in the shoulder space rises, and inflamed tendons or bursae hurt more. A different sleep position, a supporting pillow and avoiding lying on the painful shoulder can help.
The focus is on gentle mobility exercises such as pendulum swings of the arm as well as strengthening the rotator cuff and the shoulder blade muscles, often with a resistance band. Good posture relieves the shoulder additionally. Exercise with little pain and increase slowly. With acute, very strong pain or after an injury, get a medical check first.
With acute, inflammatory shoulder pain, for example a calcific shoulder, cold is usually more comfortable and can calm the inflammation. Heat, on the other hand, can intensify acute inflammation. With chronic, tension-related symptoms without acute inflammation, many find heat soothing. Try what feels good for you, and do not cool directly with ice on the skin.
Seek medical advice promptly if the shoulder is deformed after a fall or you can no longer lift the arm, if the joint is hot, red and combined with fever, or if the pain does not improve despite self-help after about two to three weeks. With sudden shoulder or arm pain plus chest pressure, shortness of breath or cold sweat, call emergency services immediately.
Yes. Pain can radiate into the shoulder without the shoulder itself being the cause. From the cervical spine, tension and nerve irritation often radiate into shoulder and arm. Rare but important: sudden pain especially in the left shoulder with chest pressure, shortness of breath or nausea can point to the heart and is an emergency.
That depends on the cause. Mild irritations often improve in one to three weeks, an impingement can heal over weeks to months with targeted physiotherapy. A calcific shoulder runs in flare-ups and can resolve on its own. A frozen shoulder often takes longer. Patience and consistent exercises pay off.

Sources

  • gesund.bund.de and Gesundheitsinformation.de (IQWiG): Shoulder pain and impingement syndrome. Accessed 2026.
  • Health portal gesundheit.gv.at: Impingement and calcific shoulder, treatment. Accessed 2026.
  • MSD Manual (Consumer Version): Shoulder disorders and shoulder pain. Accessed 2026.

This article is for general information and does not replace medical advice, diagnosis or treatment. Self-tests are only a guide. With strong, persistent or post-accident shoulder pain, or with signs of an emergency, please contact a doctor or the emergency services.