A shoulder can begin hurting when you reach into a cupboard, put on a coat or wake after sleeping awkwardly. Sometimes the cause is a short-lived strain. But if you are asking, “why does my shoulder hurt?”, because pain is limiting work, sleep, exercise or everyday tasks, it is worth finding out exactly what is happening rather than simply hoping it settles.
The shoulder is a remarkably mobile joint, but that mobility depends on several structures working together: the ball-and-socket joint, tendons, muscles, ligaments, bursa and the shoulder blade. Pain can arise from any of these, and it can occasionally be felt in the shoulder even when the source is the neck, chest or elsewhere. The pattern of pain, how it began and which movements trigger it all help guide the diagnosis.
Why does my shoulder hurt after movement or activity?
A sudden pain after lifting, catching a fall, pulling forcefully or playing sport may be caused by a muscle or tendon strain. Mild strains can improve with relative rest and sensible movement, but significant pain, weakness or loss of movement needs assessment. Trying to push through a genuine injury can prolong recovery.
Repetitive overhead activity is another common trigger. Decorating, gardening, swimming, racquet sports and manual work can irritate the tendons around the shoulder, particularly where the tendon passes through a narrow space beneath the top of the shoulder. This is often described as rotator cuff-related shoulder pain. Pain may be felt over the outer upper arm, worsen when lifting the arm, and make lying on that side uncomfortable at night.
The rotator cuff is a group of four muscles and tendons that stabilise the shoulder and help control lifting and rotation. With age, these tendons can become less resilient, and a tear may happen after an injury or develop gradually. Not every tear requires surgery, but a sudden loss of strength after trauma, especially if you cannot raise the arm, should be assessed promptly. The right treatment depends on the size and type of tear, your symptoms, activity level and the condition of the tendon.
Common causes of shoulder pain
Tendon irritation, bursitis and impingement-type pain
The bursa is a small fluid-filled cushion that helps tissues glide smoothly. It can become inflamed alongside irritated rotator cuff tendons. The result may be a painful arc when lifting the arm, often between shoulder and head height, with discomfort during dressing or reaching behind your back.
These conditions are often managed without an operation. A personalised rehabilitation plan can restore movement and strengthen the muscles that support the joint. In selected cases, a carefully placed steroid injection may reduce inflammation and pain sufficiently to allow rehabilitation to progress. An injection is not a cure for every cause of shoulder pain, and repeated injections are not appropriate for everyone, particularly where there is a significant tendon tear or other condition requiring a different approach.
Frozen shoulder
Frozen shoulder, also called adhesive capsulitis, usually develops in stages. It may start with increasingly severe pain, often at night, followed by marked stiffness. Everyday movements such as fastening a bra, reaching a back pocket or putting on a seatbelt become difficult.
It is more common between the ages of 40 and 60 and is associated with diabetes and some thyroid conditions. Recovery can take time, but treatment can help control pain and improve movement. The most suitable plan may include pain relief, a targeted injection, guided exercises or, in persistent cases, a procedure to improve the tightness around the joint.
Arthritis of the shoulder
Arthritis can affect the main ball-and-socket shoulder joint or the smaller joint at the top of the shoulder, known as the acromioclavicular joint. It may cause a deep ache, stiffness, grinding or clicking, and pain with lifting, reaching or sleeping on the affected side.
Arthritis is not always severe on an X-ray, and scans must be considered alongside your symptoms and examination. Treatment may range from activity adjustments, physiotherapy and injections to shoulder replacement surgery when pain and loss of function remain substantial despite non-surgical care.
Instability, dislocation and labral injury
If the shoulder has dislocated, partially slipped out of place or repeatedly feels as though it might “give way”, the stabilising tissues may be damaged. This is more common after contact sports, falls or a forceful injury, and can affect younger active adults as well as older patients.
A labral tear involves the rim of cartilage around the socket. It may cause catching, deep pain or a sense of instability. Accurate examination and imaging are particularly useful here, as the treatment plan differs from tendon-related pain.
Pain coming from the neck
A trapped or irritated nerve in the neck can cause pain that travels into the shoulder, arm or hand. Tingling, numbness, burning pain or weakness in the arm suggest the neck may be contributing. Shoulder movement may be reasonably preserved even though the pain feels centred around the shoulder.
This distinction matters. Treating a shoulder problem will not resolve symptoms caused mainly by the neck, which is why a careful clinical assessment is more useful than relying on a scan result alone.
When shoulder pain needs urgent medical attention
Seek urgent medical help if shoulder pain occurs with chest pain, breathlessness, sweating, nausea or pain spreading to the jaw, back or left arm. These can be signs of a serious medical problem rather than a shoulder injury.
You should also seek urgent assessment after a significant fall or accident if the shoulder looks deformed, you cannot move the arm, there is severe swelling, or the hand becomes cold, pale, numb or weak. A hot, red, very swollen joint, particularly with fever or feeling unwell, also requires prompt medical care because infection must be excluded.
Less dramatic symptoms can still justify a specialist appointment. Arrange an assessment if pain is persistent, regularly disrupts sleep, is getting worse, follows an injury, or has not improved after a sensible period of self-management. New weakness, marked stiffness or inability to return to normal activities are important reasons not to delay.
What to do while you wait for assessment
For a recent, minor injury, avoid the movement or load that sharply aggravates pain, but do not keep the shoulder completely still for prolonged periods unless you have been advised to do so. Gentle, comfortable movement can help prevent increasing stiffness. Ice or heat may be useful depending on what feels better, and simple pain relief may help if it is safe for you to take it. A pharmacist, GP or clinician can advise on suitable options, particularly if you have stomach, kidney, heart or blood-pressure conditions or take other medicines.
Avoid repeatedly testing a painful shoulder with heavy lifting, aggressive stretches or unsupervised strengthening exercises. What helps a mild tendon irritation may aggravate a tear, instability or frozen shoulder. The goal is not merely to silence pain for a day, but to protect movement and identify the underlying issue.
Getting a clear diagnosis and treatment plan
A shoulder assessment should begin with your history: when the pain started, whether there was an injury, where it hurts, what movements are restricted and whether there is pain at night, weakness, tingling or instability. Examination then checks movement, strength, tenderness and the relationship between the shoulder and neck.
Imaging may be helpful, but the type should be chosen for the clinical question. X-rays can show arthritis, fractures and joint alignment. Ultrasound can assess many rotator cuff and bursa problems dynamically. MRI provides more detailed information about tendons, cartilage, ligaments and other soft tissues. Not everyone needs every scan, and more imaging is not automatically better if it will not change treatment.
At Droitwich Knee Clinic, a one-stop shoulder pathway can combine consultant-led assessment, appropriate imaging and a discussion of treatment options in the same visit where suitable. This may offer clarity more quickly than moving between separate appointments, particularly for patients travelling from Worcestershire, Birmingham or further afield.
Your treatment should reflect your diagnosis and your priorities. For some people, a focused rehabilitation programme and time are the best route. For others, an injection can help settle pain so they can participate in rehabilitation. When there is a repairable rotator cuff tear, recurrent instability or advanced arthritis that has not responded to non-surgical treatment, surgery may offer a better chance of restoring function.
Shoulder pain is common, but it should not become something you simply work around. A clear diagnosis gives you a practical next step, whether that is reassurance, targeted rehabilitation, an injection or discussion of surgical treatment.