What Is Shoulder Pain? Causes, Symptoms & When to Worry

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Last reviewed: June 2025

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions about a medical condition.

Shoulder pain is one of the most common musculoskeletal complaints, affecting roughly 16% of the global population at any given time. It can stem from anything: a rotator cuff strain picked up in the gym, a frozen shoulder that crept in over months, or tension built up from years of desk work. Understanding the causes, recognising the symptoms, and knowing when to worry about shoulder pain can help you make better decisions about your recovery. This article breaks down the key clinical causes, explains what different types of shoulder pain actually mean, and flags the warning signs that warrant urgent attention.

Key Takeaways

• Shoulder pain affects around 16% of people globally, making it one of the most frequently reported musculoskeletal issues.
• Not all shoulder pain is serious: most cases resolve with appropriate physiotherapy, movement, and lifestyle adjustments.
• Morning and night-time shoulder pain have different causes, ranging from inflammatory conditions to positional compression.
• Red flag symptoms like sudden weakness after a fall, chest tightness, or pain radiating down the arm require immediate medical evaluation.
• Routine imaging (MRIs, X-rays) is not always necessary: a skilled clinical assessment often provides more useful information for guiding treatment.
• Pain does not always equal damage: stress, sleep quality, and prolonged sitting can all amplify shoulder pain through central sensitisation.

What Is Shoulder Pain?

The shoulder is the most mobile joint in the human body, and that freedom of movement comes at a cost. Unlike the hip, which sits in a deep socket, the shoulder relies on a complex web of muscles, tendons, ligaments, and a shallow socket called the glenoid to stay stable. When any of these structures become irritated, inflamed, or injured, the result is shoulder pain.

Shoulder pain can present as a sharp, stabbing sensation during movement, a dull ache that lingers at rest, or a deep throb that wakes you at 3am. It might be localised to the top of the shoulder, felt deep inside the joint, or referred down the arm towards the elbow. The location and behaviour of the pain often give clinicians strong clues about the underlying cause.

The annual incidence of shoulder complaints ranges from roughly 7.7 to 62 per 1,000 persons per year, and shoulder pain is the third most common orthopaedic presentation in primary care. In 2010 alone, approximately 1.2 million people visited emergency departments for shoulder problems. These numbers reflect just how widespread the issue is, and they are likely conservative, since many people tolerate shoulder discomfort for months before seeking help.

One important thing to understand early: shoulder pain is not always caused by the shoulder itself. It can sometimes be referred pain from other structures, including gallbladder issues or even cardiac problems. This is why a thorough clinical assessment matters so much, particularly if the pain came on suddenly without an obvious mechanical trigger.

Rebecca Bossick, BSc (Hons) Physiotherapy at One Body LDN, puts it simply: “The shoulder is a joint that trades stability for mobility. When people come to us with shoulder pain, we’re not just looking at the shoulder in isolation. We assess the neck, the thoracic spine, posture, and how the whole upper body moves together. That full picture is what leads to the right diagnosis.”

Common Causes of Shoulder Pain

Shoulder pain rarely has a single, neat explanation. Most presentations involve a combination of an immediate trigger (an awkward gym rep, a sudden reach for a suitcase) and an underlying root cause (months of deconditioning, poor posture, or accumulated stiffness). Understanding both layers is critical for effective long-term recovery, not just short-term relief.

Here are the most frequently seen causes:

1. Rotator cuff injuries: The rotator cuff is a group of four muscles and their tendons that stabilise the shoulder. Tears, tendinopathy, and impingement of these structures are extremely common. As much as 25% of people over 50 have some form of rotator cuff issue, and many don’t even know it.
2. Frozen shoulder (adhesive capsulitis): This condition causes progressive stiffness and pain, often without a clear injury. It tends to affect people aged 40 to 60, is more common in women, and can take 12 to 24 months to fully resolve without intervention.
3. Bursitis: The subacromial bursa is a small fluid-filled sac that cushions the rotator cuff tendons. When it becomes inflamed, usually from repetitive overhead movements, it creates a painful arc of motion, particularly between 60 and 120 degrees of arm elevation.
4. Shoulder instability and dislocation: A full or partial dislocation can stretch or tear the labrum and capsule. This is common in contact sports and can lead to recurrent instability if not rehabilitated properly.
5. Arthritis: Osteoarthritis of the shoulder joint (glenohumeral arthritis) or the acromioclavicular (AC) joint causes gradual pain, stiffness, and reduced range of motion. It is more common in older adults and those with a history of heavy manual work or sport.
6. Tendonitis: Inflammation of the biceps tendon or rotator cuff tendons, often from overuse or repetitive strain, is a frequent cause of anterior shoulder pain.
7. Referred pain: The shoulder can be a site for referred pain from the cervical spine (neck), thoracic spine, or even internal organs. Gallbladder disease, for instance, can refer pain to the right shoulder tip, while cardiac events may refer pain to the left shoulder and arm.

For desk-based professionals who spend long hours in front of screens, a combination of rounded shoulders, tight pectorals, and weakened scapular stabilisers often sets the stage for shoulder problems. The trigger might be a weekend tennis match, but the root cause has been building for years.

Typical Symptoms of Shoulder Pain

Symptoms vary widely depending on the underlying structure involved, but recognising patterns can help you and your clinician narrow things down faster.

Pain during overhead reaching, especially a catching or pinching sensation, often points towards subacromial impingement or bursitis. A deep ache inside the joint that worsens with rotation may suggest a labral tear or early arthritis. Weakness when lifting the arm, particularly after a fall or sudden strain, raises suspicion for a rotator cuff tear. Stiffness that limits your ability to reach behind your back or fasten a seatbelt is a hallmark of frozen shoulder.

Other common symptoms include clicking, popping, or grinding sensations during movement; pain that radiates from the shoulder down to the elbow or hand; and muscle spasm or tightness across the upper trapezius and neck. Some people also notice swelling or warmth around the joint, though this is less common in chronic conditions.

Women are generally more likely to report shoulder pain than men, and the reasons are thought to include hormonal influences, differences in muscle mass and joint laxity, and occupational factors.

Is Shoulder Pain Normal?

Occasional shoulder discomfort after a hard workout, a long day at the desk, or sleeping in an awkward position is common and usually resolves within a few days. This kind of transient soreness does not typically indicate structural damage.

However, pain that persists beyond two to three weeks, worsens over time, or limits your ability to carry out daily activities is not something to brush off. Chronic shoulder pain, defined as lasting longer than three months, often involves central sensitisation, where the nervous system amplifies pain signals even after the original tissue irritation has settled. Stress, poor sleep, and sedentary behaviour can all contribute to this process.

Pain does not always equal damage. A 50-year-old with a partial rotator cuff tear on MRI may have zero symptoms, while someone with a completely normal scan may experience significant pain driven by muscle imbalance, stress, and deconditioning. This is why clinical assessment, not just imaging, is so important.

Shoulder Pain in the Morning / at Night

Morning shoulder pain and night-time shoulder pain often have different underlying mechanisms, and distinguishing between them helps guide treatment.

Morning stiffness that eases within 30 to 60 minutes of movement is commonly associated with inflammatory conditions like frozen shoulder or inflammatory arthritis. The joint capsule tightens overnight, and gentle movement helps restore circulation and reduce stiffness.

Night-time pain, on the other hand, is frequently linked to rotator cuff pathology or bursitis. Lying on the affected side compresses the subacromial space, increasing pressure on irritated tendons and bursae. Many people find that sleeping on the opposite side with a pillow supporting the affected arm reduces discomfort significantly.

If you are a side sleeper, consider a medium-firm mattress that supports the shoulder without creating excessive pressure. Placing a pillow between your knees can also help maintain spinal alignment and reduce compensatory tension through the upper body.

When Should You Worry About Shoulder Pain?

Most shoulder pain is not dangerous. But certain presentations require prompt medical evaluation, and knowing these red flags could be genuinely important.

Seek urgent medical attention if you experience:

• Sudden, severe pain after a fall, collision, or heavy lift, especially if accompanied by an audible pop or tearing sensation and immediate weakness
• Inability to lift or rotate the arm at all
• Visible deformity of the shoulder or a feeling that the joint has “come out”
• Pain accompanied by chest tightness, shortness of breath, or jaw pain (possible cardiac event)
• Shoulder pain with fever, redness, and swelling (possible infection)
• Unexplained weight loss combined with persistent, worsening shoulder pain (rare, but a potential indicator of serious pathology)

Dr. Christopher Klifto, an orthopaedic surgeon at Duke Health, advises: “If you fall, have a significant strain injury, and/or feel a pop or tearing sensation in your shoulder and then have weakness lifting your arm, seek medical care.”

Shoulder pain that follows no obvious injury but comes with night sweats, fatigue, or pain that does not change with movement should also be assessed promptly. Remember that shoulder pain can occasionally be referred from internal organs, so atypical presentations warrant a thorough clinical workup.

For corporate professionals, a useful rule of thumb: if your shoulder pain is stopping you from working, training, or sleeping for more than two weeks, get it assessed. Early intervention almost always leads to faster, more complete recovery.

How Is Shoulder Pain Diagnosed?

A thorough clinical assessment is the cornerstone of shoulder diagnosis. A skilled physiotherapist or orthopaedic specialist will typically begin with a detailed history: when the pain started, what makes it better or worse, whether there was a specific injury, and how it affects daily life.

Physical examination involves a series of specific tests designed to stress individual structures. These include tests for rotator cuff integrity (empty can test, external rotation lag sign), impingement (Neer’s test, Hawkins-Kennedy test), instability (apprehension and relocation tests), and labral pathology (O’Brien’s test). The neck and thoracic spine are also assessed, since cervical radiculopathy can mimic shoulder pain convincingly.

Imaging is not always necessary and is often overused. MRI scans frequently reveal “abnormalities” in people with no symptoms at all. Studies consistently show that rotator cuff tears, labral changes, and degenerative findings are common incidental findings on imaging, particularly in people over 40. Ordering an MRI too early can sometimes do more harm than good by creating anxiety and leading to unnecessary interventions.

That said, imaging is valuable when clinical findings suggest a significant structural injury, when symptoms do not respond to a reasonable course of physiotherapy (typically six to twelve weeks), or when surgical planning is being considered. Ultrasound is often used as a first-line imaging tool for rotator cuff assessment because it is dynamic, widely available, and cost-effective.

Kurt Johnson, M.Ost (Master of Osteopathy) at One Body LDN, notes: “We see a lot of clients who come in with an MRI report and a lot of worry. But the scan is just one piece of the puzzle. What matters most is how the shoulder actually moves, how strong it is, and what the person needs to get back to doing. That’s what guides the treatment plan.”

How Is Shoulder Pain Usually Treated?

The vast majority of shoulder pain responds well to conservative treatment, with physiotherapy forming the backbone of most recovery programmes. Surgery is reserved for cases where conservative management has genuinely failed or where there is a clear structural indication, such as a large acute rotator cuff tear in an active individual.

A typical physiotherapy programme for shoulder pain includes:

1. Pain management in the acute phase: This may involve relative rest (not complete immobilisation), ice or heat application, and sometimes a short course of anti-inflammatory medication prescribed by a GP. Prolonged use of a sling is generally discouraged, as it can lead to stiffness and muscle wasting.
2. Manual therapy: Hands-on techniques including joint mobilisation, soft tissue massage, and myofascial release can help restore range of motion and reduce muscle guarding. These techniques are particularly effective for frozen shoulder and post-surgical rehabilitation.
3. Progressive exercise rehabilitation: This is the most important component. A structured programme targeting rotator cuff strengthening, scapular stability, and thoracic mobility has strong evidence for improving outcomes across nearly all shoulder conditions. Exercises are progressed gradually based on pain response and functional goals.
4. Postural and ergonomic correction: For desk-based workers, addressing workstation setup is essential. This includes monitor height, chair positioning, and taking movement breaks every 30 to 45 minutes. Small changes here can significantly reduce the mechanical load on the shoulder over a full working day.
5. Addressing contributing factors: Sleep position, stress levels, training load, and general fitness all influence shoulder pain. A biopsychosocial approach that considers these factors alongside the physical presentation tends to produce the best long-term results.

One Body LDN, named London Physiotherapy Clinic of the Year 2025, has helped over 35,000 clients recover from pain and injury using this kind of integrated approach. Their team combines exercise rehabilitation with hands-on treatment, tailoring each plan to the individual rather than following a one-size-fits-all protocol.

Frequently Asked Questions

Can shoulder pain go away on its own? Mild shoulder pain from muscle strain or overuse often resolves within one to two weeks with rest and gentle movement. However, pain lasting beyond two to three weeks, or pain that is worsening, typically benefits from professional assessment. Ignoring persistent symptoms can lead to compensatory movement patterns that create secondary problems in the neck, upper back, or opposite shoulder.

Should I get an MRI for my shoulder pain? Not necessarily. MRI is useful for specific clinical scenarios, but many shoulder conditions are diagnosed accurately through physical examination alone. Imaging is most helpful when symptoms have not improved after a reasonable trial of physiotherapy, or when a significant structural injury is suspected. Your clinician can advise whether imaging is appropriate for your situation.

Is it safe to exercise with shoulder pain? In most cases, yes, with modifications. Complete rest is rarely recommended for shoulder pain. Avoiding aggravating movements while maintaining general fitness and performing prescribed rehabilitation exercises is the preferred approach. A physiotherapist can help you identify which exercises are safe and which to avoid temporarily.

How long does frozen shoulder last? Frozen shoulder typically progresses through three phases: freezing (increasing pain and stiffness), frozen (persistent stiffness with gradually reducing pain), and thawing (gradual return of movement). The entire cycle can last 12 to 24 months without treatment. Physiotherapy and sometimes corticosteroid injections can help shorten this timeline and improve function during the process.

Can stress cause shoulder pain? Yes. Psychological stress increases muscle tension, particularly in the upper trapezius and neck muscles, and can contribute to shoulder pain. Stress also affects sleep quality and pain perception through central sensitisation. Managing stress through regular exercise, adequate sleep, and relaxation techniques can play a meaningful role in shoulder pain recovery.

When should I see a doctor versus a physiotherapist? If you have red flag symptoms (sudden severe weakness, deformity, chest pain, fever), see a doctor or visit A&E immediately. For most other shoulder pain, a physiotherapist is an excellent first point of contact. In the UK, you do not need a GP referral to see a physiotherapist privately, and early assessment often leads to faster recovery.

Your Next Step

Shoulder pain is common, but that does not mean you should accept it as part of life. Whether yours started after a heavy deadlift, crept in after months of long hours at a desk, or appeared without any obvious cause, getting a proper assessment is the fastest route to understanding what is going on and what to do about it.

If your shoulder has been bothering you for more than a couple of weeks, consider getting it looked at by a specialist physiotherapy team. At One Body LDN, their award-winning physiotherapists combine hands-on treatment with structured rehabilitation programmes designed around your specific goals, whether that is returning to sport, sleeping without pain, or simply being able to reach a shelf without wincing. They accept all major private health insurers, and you can book your first session in under 60 seconds with no GP referral needed.

References

• Shoulder pain is the third most common orthopaedic presentation in primary care
• Global prevalence of shoulder pain, incidence rates, and demographic patterns
• Common causes of shoulder pain including arthritis, bursitis, and tendonitis
• Shoulder pain as referred pain from gallbladder issues or heart problems
• Approximately 1.2 million emergency department visits for shoulder problems in 2010
• Dr. Christopher Klifto on when to seek medical care for shoulder injuries