Shoulder Pain

Shoulder pain refers to pain and discomfort felt because of problems involving the shoulder joint, the surrounding muscles and tendons, ligaments, bursae, bones, or pain referred from the neck. Because the shoulder is one of the most mobile joints in the body, it is vulnerable to injury, overuse, and degenerative processes. However, not every pain felt in the shoulder comes directly from the joint itself; the neck, chest wall, and some internal organ-related pains can also be referred to the shoulder region. ^[1][2][3]

Pain felt in the front, top, or back of the shoulder, or radiating down the outer side of the arm, may suggest different structures. Pain that increases when the arm is lifted overhead, discomfort when lying on the shoulder at night, limitation of movement after sudden trauma, or a shoulder that gradually becomes stiff all carry different clinical meanings. For that reason, in understanding shoulder pain it is important not only to ask “is there pain?” but also “with which movement, when, and how does it increase?” ^[1][4][5]

What Can Cause Shoulder Pain?

Common intra-shoulder causes

Problems involving the rotator cuff tendons, shoulder impingement syndrome, bursitis, tendinitis, and frozen shoulder are among the most common causes. Pain that worsens especially with overhead movements, difficulty raising the arm to the side or upward, and an inability to lie on the affected shoulder at night may suggest the structures around the rotator cuff. In frozen shoulder, by contrast, marked limitation of motion is more prominent along with pain, and the person may have difficulty moving the shoulder adequately both on their own and with outside assistance. ^[1][2][4]

Shoulder arthritis, instability, dislocations, and fractures are also important causes. After trauma, deformity of the shoulder, sudden swelling, inability to raise the arm, or marked weakness makes structural injury more likely. In athletes and people who perform repetitive overhead movements, tendon and bursal problems are more common, whereas in older adults degenerative tears or arthritic processes may become more prominent. The likely causes vary according to age and pattern of use. ^[1][2][5]

Pain referred from the neck or internal organs

Shoulder pain can sometimes be related to nerve compression originating in the neck. In this case, pain radiating from the neck down the arm, numbness, tingling, or weakness may accompany it. If the pain is triggered more by neck movement than by shoulder movement, a cervical source becomes more likely. Likewise, pain arising from the chest, diaphragm, or certain internal organs may also be referred to the shoulder region; therefore, shoulder pain does not always mean an orthopedic problem. ^[1][3][5]

In particular, left shoulder pain accompanied by chest pressure, shortness of breath, sweating, or nausea requires attention for possible cardiac causes. It is also known that right shoulder pain may occur as referred pain from certain intra-abdominal conditions or diaphragmatic irritation. These examples show why it is important not to limit shoulder pain only to the joint itself. The relationship of the pain to systemic symptoms, as much as to movement, changes the framework of evaluation. ^[1][3]

What Might Associated Findings Mean?

Pain that worsens at night, difficulty reaching overhead, weakness when opening the arm out to the side, and inability to lie on the shoulder are commonly described in tendon- and bursa-related problems. Stiffness and loss of both active and passive motion may favor frozen shoulder. Sudden swelling, bruising, or a feeling that the shoulder has “come out of place” after trauma suggests structural injuries such as dislocation or fracture. Pain radiating downward from the shoulder together with neurologic findings brings cervical or nerve-related causes to mind. ^[1][2][4]

Fever, redness, marked warmth, and generalized malaise may be warning signs for infection around the shoulder or inflammatory systemic processes. In older adults, new-onset pain in the shoulder girdle together with morning stiffness may be related to different rheumatologic causes. In short, shoulder pain gains meaning not only through the severity of pain itself, but also through the accompanying limitation of movement, weakness, trauma history, and systemic signs. ^[1][2][3]

What Stands Out During Medical Evaluation?

When shoulder pain is evaluated, clinicians ask about the location of the pain, its onset, any history of trauma, repetitive use, sports or night-pain pattern, and which movements increase the pain. Whether the person can raise the arm independently and whether daily activities such as combing the hair or reaching behind the back are difficult provide important clues. Associated findings such as neck pain, numbness, weakness, chest pain, or shortness of breath can change the diagnostic direction. ^[1][4][5]

On examination, the appearance of the shoulder, points of tenderness, active and passive range of motion, strength, and certain special tests are assessed. When necessary, imaging and further studies may be used to distinguish fracture, dislocation, tendon tear, arthritis, or neck-related causes. The physician’s aim is not merely to say “shoulder pain,” but to determine whether the pain is intra-articular, tendon- or bursa-related, neurologic, or referred. This distinction explains why pains felt in the same region may be evaluated very differently. ^[1][2][5]

When Is Faster Evaluation Needed?

Shoulder pain requires prompt evaluation if there is marked deformity after trauma, inability to lift the arm, severe swelling, numbness or weakness, or pain accompanied by fever and redness. In addition, if shoulder pain occurs together with chest pain, shortness of breath, sweating, or nausea, urgent assessment is needed because of possible cardiac causes. In such a case, the problem may not be in the shoulder itself. ^[1][2][3]

Milder but recurrent shoulder pain that disrupts sleep, gradually causes limitation of movement, or clearly reduces daily function should also be evaluated on a planned basis. Shoulder pain is common, but its cause can range from simple overuse to tendon tear, from a neck-related problem to referred visceral pain. This content does not replace diagnosis; individual medical evaluation is important especially when trauma, weakness, or systemic symptoms are present. ^[1][2][5]

In shoulder pain, whether the dominant complaint is pain or limitation of movement is also informative in the differential diagnosis. Some people have difficulty describing the pain itself but notice marked catching during daily activities such as combing their hair, reaching for a seat belt, or reaching behind their back. Situations in which both active and passive movements are restricted may suggest a process of joint stiffness rather than simple muscle fatigue. For this reason, asking about the effect of shoulder pain on function is often more informative than asking only about pain intensity. ^[1][2][5]