Pain in the Shoulder at Night: Why

To learn more, consult the guide on Supraspinatus Tendinitis: Exercises and Recovery Times. To learn more, consult the guide on Shoulder Pain: Complete Guide to Causes and Treatment. To learn more, consult the guide on Shoulder Anatomy: Bones, Muscles, and Biomechanics.

Nocturnal shoulder pain represents a debilitating condition affecting a significant number of individuals, compromising sleep quality, mood, and consequently, quality of life. Although shoulder pain can manifest at any time of day, its intensification during nighttime hours is a particularly frustrating phenomenon and often indicative of specific underlying problems. Understanding the mechanisms that lead to the nocturnal worsening of pain and adopting effective strategies to manage it is fundamental for embarking on a recovery path and restoring adequate rest. This article, based on over thirty years of clinical experience and the latest scientific evidence, aims to thoroughly explore the causes, symptoms, diagnostic methods, and therapeutic strategies, with a particular focus on ways to improve sleep.

Shoulder Anatomy and Biomechanics: A Brief Review

The shoulder is a complex joint formed by bones, muscles, and ligaments in the upper arm area, enabling wide mobility but susceptible to structural changes causing nocturnal discomfort. The shoulder is one of the most complex and mobile joints in the human body, designed to allow a wide range of movements. However, its extraordinary mobility is balanced by a relative instability, which makes it susceptible to various pathologies. The shoulder joint is actually a complex of four functional joints:

For a complete overview, see the comprehensive guide to shoulder pain.

• Glenohumeral joint: The main one, between the head of the humerus and the glenoid cavity of the scapula. It is a ball-and-socket joint that allows extensive movements.
• Acromioclavicular joint: Between the acromion of the scapula and the clavicle.
• Sternoclavicular joint: Between the sternum and the clavicle.
• Scapulothoracic joint: Not a true anatomical joint, but a gliding plane between the scapula and the rib cage, fundamental for shoulder stability and mobility.

Shoulder stability is ensured by a complex system of muscles, tendons, and ligaments. The rotator cuff, a group of four muscles (supraspinatus, infraspinatus, teres minor, and subscapularis) and their tendons, is crucial for dynamic stabilization and for rotation and abduction movements. Other important structures include the articular capsule, the glenohumeral ligaments, the long head of the biceps tendon, and the subacromial bursa, a small fluid-filled sac that reduces friction between the rotator cuff tendons and the acromion. Any alteration or inflammation of these structures can lead to pain, especially during nocturnal rest.

Why Shoulder Pain Worsens at Night: The Mechanisms

The worsening of shoulder pain during the night is not random, but is the result of a combination of physiological, biomechanical, and inflammatory factors.

1. Sleep Position and Compression

One of the most direct causes is the position assumed during sleep. Sleeping on the affected shoulder can cause direct compression of inflamed structures (tendons, bursae, nerves), increasing pressure and irritation. Even sleeping supine without adequate support can lead to suboptimal positioning of the arm and shoulder, resulting in stretching or compression. Prolonged immobility in an incorrect position can also reduce local blood flow (relative ischemia), contributing to the accumulation of painful metabolites.

2. Accumulation of Inflammatory Mediators

During the day, muscle activity and movement promote blood and lymphatic circulation, helping to “wash away” chemical mediators of inflammation (such as prostaglandins and cytokines) that contribute to pain. At night, with reduced physical activity, the drainage of these mediators decreases, leading to their accumulation in inflamed areas. This can increase the sensitivity of nociceptors (pain receptors), making the pain more perceptible.

3. Effects of Gravity and Posture

In a supine or lateral position, gravity can exert traction or compression on the shoulder structures, depending on the pathology. For example, in cases of instability, gravity can accentuate nocturnal subluxation. In cases of tendinopathy, the weight of the arm can stretch inflamed tendons.

4. Reduced Distraction and Increased Awareness

During the day, daily activities and cognitive distractions can reduce the perception of pain. At night, in a quiet environment with fewer external stimuli, attention focuses more on bodily sensations, making the pain more evident and difficult to ignore.

5. Hormonal Variations and Circadian Rhythm

The human body follows a circadian rhythm that influences hormone production. Cortisol levels, a hormone with anti-inflammatory properties, tend to be lower during the night and in the early morning hours. This reduction can contribute to a greater perception of pain and an amplification of the inflammatory response. Melatonin, the sleep hormone, can also influence pain perception, although the link is complex and subject to study.

6. Psychological Factors

Stress, anxiety, and depression can amplify pain perception and disturb sleep, creating a vicious cycle. Worry about nocturnal pain can increase pre-sleep anxiety, making it harder to fall asleep and worsening the quality of rest.

Common Causes of Nocturnal Shoulder Pain

Various pathological conditions can manifest or worsen during the night. An accurate diagnosis is essential for effective treatment.

1. Rotator Cuff Pathologies

These are among the most frequent causes of shoulder pain, especially nocturnal.

• Rotator cuff tendinopathy: Inflammation or degeneration of the tendons (often the supraspinatus). Pain is typically aggravated by overhead movements and can be very intense at night, especially if sleeping on the affected shoulder.
• Subacromial bursitis: Inflammation of the bursa located under the acromion and above the rotator cuff tendons. It causes acute, often throbbing pain, which worsens with pressure or movement, making it difficult to find a comfortable sleeping position.
• Partial or complete rotator cuff tears: Can be traumatic or degenerative. Nocturnal pain is a common symptom, often accompanied by weakness and functional limitation.

2. Adhesive Capsulitis (Frozen Shoulder)

This condition is characterized by progressive stiffness and shoulder pain, due to inflammation and thickening of the joint capsule. Adhesive capsulitis develops in three phases:

• Painful phase (or freezing phase): Pain is intense and constant, worsens at night and with movement. Mobility begins to decrease. This is the phase where nocturnal pain is most acute.
• Stiff phase (or frozen phase): Pain may decrease, but stiffness is maximal, with significant limitation of all movements.
• Resolution phase (or thawing phase): Mobility gradually begins to improve.

3. Subacromial Impingement Syndrome

This occurs when the rotator cuff tendons or the subacromial bursa are compressed between the head of the humerus and the acromion during arm movements, especially in elevation. The pain is often referred to the lateral aspect of the shoulder and can radiate to the arm. At night, compression due to position can exacerbate the pain.

4. Osteoarthritis of the Glenohumeral or Acromioclavicular Joint

Wear and tear of the articular cartilage can cause pain, stiffness, and crepitus. Arthritic pain is often worse after periods of inactivity (morning stiffness) and can intensify at night due to inflammation and lack of movement that lubricates the joint.

5. Tendon Calcifications (Calcific Tendinopathy)

Calcium deposits in the rotator cuff tendons can cause extremely acute and sudden pain, often described as “stabbing.” This pain is notoriously severe at night and can make it impossible to find a comfortable position.

6. Pathologies of the Long Head of the Biceps Tendon

Inflammation (tendinopathy) or subluxation of the biceps tendon can cause pain in the front of the shoulder, which can worsen with activity and during the night, especially if sleeping on the side.

7. Shoulder Instability

Episodes of subluxation (partial displacement of the humeral head from the glenoid) or dislocation (complete displacement) can cause pain and apprehension. Even in the absence of an acute event, a chronically unstable shoulder can generate nocturnal pain due to tension on the ligaments and capsule.

8. Cervical Radiculopathy

Pain originating from the cervical spine (compressed or irritated nerves in the neck) can radiate to the shoulder and arm, mimicking a shoulder pathology. This referred pain can be particularly problematic at night, depending on the position of the neck and shoulder.

9. Other Causes

Less common but important to consider are tumors, infections, polymyalgia rheumatica, or other systemic conditions that can manifest with shoulder pain.

Symptoms Associated with Nocturnal Pain

In addition to the pain itself, patients may experience a series of related symptoms:

• Difficulty falling asleep or frequent awakenings: Pain disrupts the sleep cycle.
• Acute, dull, throbbing, or stabbing pain: The quality of pain varies depending on the cause.
• Pain radiation: It can extend to the arm, neck, scapula, or hand.
• Morning stiffness: The shoulder may feel “locked” upon waking.
• Muscle weakness: Difficulty lifting or moving the arm.
• Limited range of motion: Difficulty performing daily activities such as dressing or combing hair.
• Clicking or crepitus: Sensation of rubbing or noise during movement.
• Paresthesias: Tingling or numbness in the arm or hand, especially if there is a nervous component.

Diagnosis of Nocturnal Shoulder Pain

An accurate diagnosis is the first step towards effective treatment. The diagnostic process includes:

1. Detailed Anamnesis

The doctor or physical therapist will gather information about the patient’s clinical history, including:

• Pain description: Location, intensity, type (acute, dull, burning), factors that aggravate or relieve it.
• Onset of pain: Traumatic or gradual.
• Daily and work activities: Repetitive movements, sustained postures.
• Sports activities: Type of sport, training techniques.
• Sleep position: Which positions worsen the pain.
• Medical history: Previous pathologies, medications taken.

2. Objective Examination

A complete physical examination of the shoulder and cervical spine is crucial:

• Inspection: Assessment of asymmetries, muscle atrophy, swelling, redness.
• Palpation: Identification of painful points or muscle tension.
• Mobility assessment: Measurement of active and passive range of motion in all directions.
• Muscle strength tests: Assessment of the strength of the rotator cuff and deltoid muscles.
• Specific tests: Clinical maneuvers to identify rotator cuff pathologies (e.g., Neer’s test, Hawkins-Kennedy test, Jobe’s test), instability (e.g., apprehension test), adhesive capsulitis, biceps pathologies.
• Cervical spine assessment: To exclude or confirm cervical radiculopathy as the cause of referred pain.

3. Instrumental Examinations

Depending on the clinical suspicion, the following may be requested:

• X-ray (RX): Useful for highlighting osteoarthritis, tendon calcifications, fractures, or bone abnormalities.
• Ultrasound: Excellent for visualizing soft tissues such as tendons (lesions, inflammations, calcifications), bursae (bursitis), and ligaments. It is dynamic and non-invasive.
• Magnetic Resonance Imaging (MRI): Provides detailed images of bones, cartilage, tendons, ligaments, and capsule. It is the examination of choice for complex rotator cuff lesions, capsulitis, labral tears, or intra-articular pathologies.
• Electromyography (EMG): If cervical radiculopathy or peripheral neuropathy is suspected.

Physiotherapy Treatment for Nocturnal Shoulder Pain

Physiotherapy treatment is often the first line of intervention and is based on an individualized approach, aimed at reducing pain, restoring function, and preventing recurrence.

Objectives of Physiotherapy Treatment:

• Reduction of pain and inflammation.
• Recovery of joint mobility.
• Muscle strengthening and improved stability.
• Improvement of motor control and proprioception.
• Patient education on pain management and prevention.

Treatment Phases:

1. Acute Phase (Pain and Inflammation Management)

In this phase, the main goal is to relieve pain and reduce inflammation.

• Relative rest: Avoid activities that aggravate the pain.
• Cryotherapy (ice): Ice applications for 15-20 minutes, several times a day, can help reduce inflammation and pain.
• Instrumental physical therapies:

• TENS (Transcutaneous Electrical Nerve Stimulation): For pain modulation.

• Ultrasound, Laser Therapy, Tecar Therapy: Can promote tissue healing and reduce inflammation.

• Shockwave therapy: Particularly effective for calcific tendinopathies.
• Gentle passive mobilization: Maintain minimal joint mobility without aggravating the pain.
• Nocturnal postural education: Teach the patient the most suitable sleeping positions (see next section).

2. Subacute/Chronic Phase (Function Recovery)

Once acute pain is under control, the focus shifts to complete function recovery.

• Manual Therapy:

• Joint mobilizations: Specific techniques to improve the mobility of the glenohumeral, acromioclavicular, and scapulothoracic joints.

• Myofascial techniques: Release of muscular and fascial tensions that can contribute to pain and limited movement.

• Stretching: To improve the elasticity of muscles and the capsule (e.g., stretching of the posterior capsule, pectorals, latissimus dorsi).

• Therapeutic Exercises: A progressive exercise program is fundamental.

• Mobility exercises:

• Codman’s pendular exercises: Circular arm movements, letting it hang freely, to gently mobilize the joint.

• Self-assisted exercises: Use of a stick or pulley to guide the arm through the range of motion without active effort from the painful shoulder.

• Strengthening exercises:

• Rotator cuff: Exercises with elastic bands or light weights for internal and external rotations, abduction. Research has shown that balanced cuff strengthening is crucial for stability and recurrence prevention.

• Scapular stabilizers: Exercises for the muscles that control the scapula (e.g., rowing, “Y”, “T”, “W” with light weights or elastic bands) are essential for improving shoulder biomechanics.

• Deltoid and other accessory muscles: Progressive strengthening to improve overall arm strength.

• Motor control and proprioceptive exercises: To improve coordination and awareness of shoulder position in space, essential for preventing incorrect movements.

• Global Postural Reeducation (GPR): Assessment and correction of incorrect postures that can affect the shoulder, both standing and sitting.

• Ergonomics and Activity Modifications:

• Advice on how to modify work or sports activities to reduce stress on the shoulder.

• Use of aids or adaptations to facilitate movements.

The exercise program must be carefully monitored by the doctor or physical therapist and progress gradually, respecting tissue healing times and patient tolerance.

Strategies and Tips for Better Sleep with Shoulder Pain

Managing nocturnal pain is crucial for recovery.

1. Choosing a Sleep Position

• Avoid sleeping on the painful shoulder: This is the most important rule. Direct pressure can aggravate inflammation and pain.
• Sleeping supine (on your back): This is often the most recommended position. For optimal support, place a small pillow under the arm of the painful shoulder, so that the arm is slightly elevated and supported, keeping the shoulder in a neutral position. Another pillow under the knees can help maintain spinal alignment.
• Sleeping on the opposite side: If you prefer to sleep on your side, position yourself on the non-painful side. Place a pillow between your arms, hugging it, to support the arm of the affected shoulder and prevent it from falling forward, putting tension on the capsule and tendons. A pillow between the knees can improve spinal alignment.
• Wedge pillows: Can be useful for slightly elevating the torso, reducing pressure on the shoulder and promoting the drainage of inflammatory fluids.

2. Support and Orthopedic Pillows

• Neck pillows: A pillow that adequately supports the cervical curve can prevent neck tension that can radiate to the shoulder.
• Body pillows: Can offer complete support, helping to maintain a stable and comfortable position throughout the night.

3. Pain Management Before Bed

• Ice application: An ice application to the shoulder for 15-20 minutes before going to bed can help reduce inflammation and numb the area, providing temporary relief.
• Medications: If prescribed by your doctor or physical therapist, taking non-steroidal anti-inflammatory drugs (NSAIDs) or other pain relievers before bed can help manage nocturnal pain. Always follow medical instructions.
• Relaxation exercises: Deep breathing techniques, meditation, or light stretching can help relax muscles and mind, facilitating falling asleep.

4. Optimal Sleep Environment

• Darkness and silence: Ensure the bedroom is dark, quiet, and free from distractions.
• Adequate temperature: Maintain a comfortable temperature in the room.
• Avoid stimulants: Coffee, tea, alcohol, and nicotine before bed can interfere with sleep.

5. Pre-Sleep Routine

Establishing a relaxing routine before bed can signal to the body that it’s time to rest. This can include a warm bath, reading a book, or listening to relaxing music.

Shoulder Pain Prevention

Prevention is fundamental for maintaining shoulder health.

• Regular and balanced physical exercise: Maintain the strength and flexibility of the shoulder and surrounding muscles. A program for strengthening the rotator cuff and scapular stabilizers is recommended.
• Correct posture: Pay attention to posture during daily, work, and sports activities. Avoid hunching shoulders forward or maintaining prolonged static positions.
• Avoid overloads and repetitive movements: If work or sport requires repetitive shoulder movements, take frequent breaks and use correct techniques.
• Adequate warm-up: Before any intense physical activity, perform a specific warm-up for the shoulder.
• Regular stretching: Maintain the elasticity of the shoulder muscles and capsule.
• Stress management: Stress can increase muscle tension and pain perception.
• Listen to your body: Do not ignore the first signs of pain. Promptly consult your doctor or physical therapist in case of persistent symptoms.

Frequently Asked Questions (FAQ)

Conclusion

Nocturnal shoulder pain is a symptom that should not be underestimated. Its persistence can indicate a variety of conditions, from simple inflammations to more complex injuries, all capable of significantly impacting quality of life. Early and accurate diagnosis, followed by a personalized physiotherapy treatment plan, is essential to alleviate pain, restore function, and, above all, regain restorative sleep. Adopting targeted sleep strategies, along with an exercise program and postural advice, is key to managing this condition. It is fundamental to always rely on your doctor or physical therapist for a safe and effective therapeutic path, avoiding self-diagnosis and self-treatment.

Frequently Asked Questions

Is nocturnal shoulder pain always serious?

Nocturnal shoulder pain can stem from various conditions, ranging from mild inflammation to more significant structural pathologies. While not always indicative of a severe issue, persistent night pain warrants professional evaluation to identify the underlying cause and guide appropriate management.

What is the best position to sleep with shoulder pain?

The optimal sleep position generally involves avoiding direct pressure on the affected shoulder. Sleeping on the back or the unaffected side, often with a pillow supporting the arm or between the knees, can help reduce discomfort and promote better alignment.

How long does it take to recover from nocturnal shoulder pain?

Recovery time for nocturnal shoulder pain varies significantly depending on the underlying diagnosis, its severity, and individual response to treatment. Consistent adherence to a prescribed physical therapy program and medical recommendations is crucial for effective recovery.

Can I do exercises if I have shoulder pain at night?

Therapeutic exercises, guided by a physical therapist, are often a key component of managing nocturnal shoulder pain. However, it is essential to perform only exercises specifically prescribed for the diagnosed condition, as inappropriate movements can exacerbate symptoms.

Resources

Listen to this article

---

Summary infographic

Click to enlarge. Download and share freely, citing the source.

Sources and Scientific References

1. Choi YS, Kim YW, Kim YS, Kim YK. The effect of sleep position on shoulder pain: a systematic review. J Back Musculoskelet Rehabil. 2021;34(4):559-
2. Lewis JS. Rotator cuff tendinopathy/subacromial pain syndrome: a review of the clinical evidence for diagnosis and treatment. Br J Sports Med. 2016;50(22):1391-
3. Page MJ, Green S, Kramer S, Johnston RV, McBain B, Buchbinder R. Manual therapy and exercise for adhesive capsulitis (frozen shoulder). Cochrane Database Syst Rev. 2014;2014(8):CD
4. DOI: 10.1002/14651858.CD011275.pub2
5. Littlewood C, Ashton J, Chance-Larsen K, May S, Sturrock B. Physiotherapy for rotator cuff tendinopathy: a systematic review and meta-analysis. Br J Sports Med. 2014;48(13):1031-

Sources and Scientific References

1. Baeske R et al. (2024). In people with shoulder pain, mobilisation with movement and exercise improves function and pain more than sham mobilisation with movement and exercise: a randomised trial. J Physiother. 70:288-293. DOI | PubMed
2. Tomás CC et al. (2016). Proceedings of the 3rd IPLeiria’s International Health Congress : Leiria, Portugal. 6-7 May 2016. BMC Health Serv Res. 16 Suppl 3:200. DOI | PubMed
3. Ortega-Castillo M et al. (2022). The role of progressive, therapeutic exercise in the management of upper limb tendinopathies: A systematic review and meta-analysis. Musculoskelet Sci Pract. 62:102645. DOI | PubMed
4. Akçin Aİ et al. (2025). The Clinical Efficacy of Extracorporeal Shock Wave Therapy Combined With Platelet-Rich Plasma and Exercise for Lateral Epicondylitis: Prospective Randomized Sham-Controlled Ultrasonographic Study. Arch Phys Med Rehabil. 106:1173-1182. DOI | PubMed
5. Durgut E et al. (2024). Short-Term Effects of Cold Therapy and Kinesio Taping on Pain Relief and Upper Extremity Functionality in Individuals with Rotator Cuff Tendonitis: A Randomized Study. Medicina (Kaunas). 60. DOI | PubMed