What is frozen shoulder and how is it diagnosed? Frozen shoulder, also called adhesive capsulitis, is a condition that causes shoulder pain and stiffness as the joint capsule thickens and tightens. A clinician usually diagnoses it by asking about your symptoms and examining how far you can move your shoulder; imaging may help rule out other causes.
This article explains common symptoms, risk factors, and the typical course of the condition. You will also learn what happens during an appointment, which problems can look similar, and when imaging or further care may be considered.
What is frozen shoulder and how is it diagnosed?
Frozen shoulder is a painful condition in which the flexible tissue surrounding the shoulder joint becomes inflamed, thickened, and tight. That tissue is called the joint capsule. As it restricts the joint, shoulder movement becomes increasingly limited.
Doctors also call the condition adhesive capsulitis. The name describes changes in the capsule, but it does not mean the shoulder is literally stuck or that bones have fused together. Many people improve over time, though symptoms can last for months or longer.
Diagnosis is usually based on your symptom history and a physical examination. A clinician checks both active movement—how far you can move your arm yourself—and passive movement—how far the arm moves when the clinician gently guides it. Frozen shoulder typically restricts both, especially rotation, though the pattern can vary.
There is no single blood test or scan that proves frozen shoulder. X-rays or other imaging may be used when the clinician needs to check for arthritis, a fracture, a rotator cuff problem, or another explanation for your symptoms.
Common symptoms and how they change
Symptoms often develop gradually. Pain may appear first, followed by increasing stiffness that makes ordinary tasks harder. The discomfort can be felt deep in the shoulder or along the upper arm, and it may be worse at night or when you lie on the affected side.
People often notice difficulty reaching overhead, reaching behind the back, putting on a coat, fastening clothing, or combing their hair. As movement declines, the shoulder may feel tight in more than one direction rather than painful only during one particular action.
Frozen shoulder is often described in three stages: a painful “freezing” stage, a stiff “frozen” stage, and a “thawing” stage in which motion gradually returns. These labels are useful descriptions, not a precise timetable. Stages can overlap, and the course differs from person to person.
- Freezing: Pain and stiffness build, and reaching or sleeping on that side may become difficult.
- Frozen: Pain may ease for some people, but restricted movement can remain prominent.
- Thawing: Movement gradually improves, sometimes over an extended period.
Not everyone experiences these stages in a clear sequence. Improvement may be uneven, and pain can remain even as movement starts to return.
Who is more likely to develop frozen shoulder?
Frozen shoulder is more common in middle age and occurs more often in people with diabetes or certain thyroid conditions. It can also follow a period when the shoulder is kept still, such as after surgery, an injury, or another painful condition. Reduced movement may contribute to stiffness, although it does not explain every case.
Sometimes there is no clear trigger. Having a risk factor does not mean you will develop frozen shoulder, and shoulder stiffness can have many other causes. Tell the clinician about relevant health conditions, recent injuries, operations, and any time you spent limiting shoulder movement.
A useful point that is easy to miss: not moving a painful shoulder at all can add to stiffness, but forcing a painful shoulder through aggressive stretches can also aggravate symptoms. The aim is usually comfortable, guided movement rather than either complete avoidance or pushing hard through pain. A clinician or physical therapist can help tailor that balance.
How clinicians diagnose frozen shoulder
Your appointment generally combines the story of your symptoms with a hands-on examination. These steps help the clinician decide whether the restricted movement fits frozen shoulder and whether another condition needs attention.
- Describe the problem. Explain when symptoms began, whether they came on gradually or after an injury, where you feel pain, and which actions are difficult. Mention night pain and how symptoms have changed over time.
- Review your health history. The clinician may ask about diabetes, thyroid disease, past shoulder problems, surgery, injury, and any period of reduced movement. Bring a list of medications and relevant medical conditions.
- Check shoulder movement. You may be asked to lift, rotate, and reach with your arm in different directions. The clinician may then gently move your arm to compare passive movement with the movement you can produce yourself.
- Assess pain and strength. The examination may include checks of tenderness, strength, and nearby areas such as the neck. Pain can limit effort, so weakness does not automatically mean a muscle or tendon is torn.
- Decide whether tests are needed. If your history and examination fit frozen shoulder, additional testing may not be needed to identify the pattern. Imaging can be useful when symptoms, examination findings, or injury history suggest another cause.
A key clue is loss of both active and passive shoulder motion, often with restricted outward rotation. The exact examination findings depend on the person, and no single movement by itself confirms the diagnosis.
What tests can be used?
Tests are chosen to answer a specific question, such as whether arthritis or an injury better explains your symptoms. They are not always required to diagnose typical frozen shoulder.
| Test or assessment | What it can show | Best for |
|---|---|---|
| History and physical examination | Symptom pattern, pain, and limits in active and passive movement | Assessing whether the overall pattern fits frozen shoulder |
| X-ray | Bone and joint changes, including some forms of arthritis or evidence of injury | Checking for bony causes of stiffness or pain |
| Ultrasound | Structures such as tendons and nearby soft tissues | Looking into a possible rotator cuff or other soft-tissue problem |
| MRI | Detailed images of soft tissues and other structures in the shoulder | Investigating a suspected alternative problem when examination alone is not enough |
| Blood tests | Signs of selected medical conditions, when indicated | Following up on a specific concern; they do not confirm frozen shoulder |
An X-ray may look normal in frozen shoulder. That does not rule out the condition, because the main problem involves the capsule and movement rather than a visible bone change. MRI and ultrasound findings must also be interpreted alongside symptoms and examination findings; an image alone does not establish the cause of pain.
Conditions that can resemble frozen shoulder
Several shoulder problems cause pain or restricted movement. The distinction matters because the right evaluation and treatment depend on what is causing the symptoms.
- Rotator cuff problems: Tendon irritation or a tear can cause pain and difficulty lifting the arm. Active movement or strength may be more affected than passive movement, though symptoms can overlap.
- Shoulder arthritis: Wear or inflammation in a joint can cause stiffness and pain. X-rays may help identify joint changes that are not visible during a physical examination.
- Shoulder bursitis: Irritation of a small cushioning sac can make movement painful. Pain may be prominent with certain motions, but the full pattern differs from person to person.
- Neck-related pain: A problem in the neck can send pain toward the shoulder or arm. Neck movement, sensation, and other examination findings can help point to this source.
- Fracture or another injury: A recent fall or direct blow changes what the clinician needs to check. Report the injury clearly, even if the shoulder became stiff later.
These conditions can occur alongside frozen shoulder. If your symptoms do not fit the usual pattern or fail to improve as expected, the clinician may reassess the diagnosis rather than assume every new symptom comes from the same cause.
When to seek medical care
Arrange an assessment if shoulder pain and stiffness persist, limit daily activities, or keep getting worse. A clinician can check for frozen shoulder and other causes, then discuss a plan suited to your symptoms and health history.
Seek prompt medical care after a significant injury, or if you have severe pain with a visibly deformed shoulder or cannot use the arm. Fever, redness, or marked warmth around the joint also needs prompt evaluation, especially if you feel unwell. Chest pressure or pain with shortness of breath is an emergency rather than a routine shoulder concern.
During an appointment, mention symptoms such as numbness, tingling, or pain spreading from the neck, since those details may change the evaluation. If you already have a diagnosis but develop a new or sharply different symptom, contact your clinician for guidance.
How to prepare for a shoulder evaluation
A little preparation can make it easier to explain the pattern and get a useful examination. You do not need to diagnose yourself before the visit.
- Write down when the pain and stiffness began and whether they changed gradually or suddenly.
- Note the tasks that are difficult, such as reaching overhead or behind your back, and whether pain wakes you at night.
- Bring details about recent injuries, operations, other shoulder conditions, and relevant health problems.
- List medicines or treatments you have tried and whether they affected pain or movement.
- Wear clothing that allows the clinician to examine your shoulder and move your arm safely.
Do not try to prove that the shoulder is stiff by repeatedly forcing it into painful positions before the visit. A clear description of what you can and cannot do is more useful and less likely to irritate the joint.
What diagnosis means for next steps
A diagnosis helps guide a plan, but it does not predict exactly how quickly your shoulder will improve. Care may include education, exercises or physical therapy, and strategies to manage pain while preserving comfortable movement. The suitable approach depends on the degree of pain and stiffness, your general health, and what is safe for you.
Ask the clinician which movements are appropriate, how much discomfort is acceptable during exercise, and when to stop or seek advice. If progress stalls or symptoms change, follow-up allows the plan and diagnosis to be reviewed. Do not begin forceful stretching or use a shoulder device as a substitute for personalized advice.
Frozen shoulder can be frustrating because the recovery process may be slow. Understanding that examination findings—not a single scan—usually guide diagnosis can help set realistic expectations and focus attention on the next practical step: getting the shoulder assessed.
Frozen shoulder is a tightening of the tissue capsule around the shoulder joint that causes pain and restricted movement. To answer “what is frozen shoulder and how is it diagnosed,” clinicians usually rely on your symptom history and a physical examination, with imaging used when needed to check for other causes.
If shoulder stiffness is limiting your daily activities, make an appointment and note when symptoms began, what movements are difficult, and any relevant health conditions or injuries. Avoid forcing painful stretches while you wait; ask a clinician what level of movement is appropriate for you.