Rotator Cuff Injury or Frozen Shoulder? How to Tell the Difference and What Helps

The rotator cuff is a group of four muscles and their tendons that keep the ball of your shoulder centred in the socket and help you lift and rotate your arm. Clinicians now often use the term rotator cuff related shoulder pain. It covers irritated or overloaded tendons (tendinopathy), what used to be called impingement, and partial or full tears.

Common signs include:

• Pain lifting your arm out to the side or overhead, often with a "painful arc" part way through the movement
• Pain reaching behind your back or into a coat sleeve
• An ache at night, especially lying on that side
• Weakness, or a catching feeling in the shoulder

Common causes include a sudden increase in training or lifting, repeated overhead work such as decorating or DIY, tendon changes that come with age, and falls onto the shoulder or an outstretched arm, including slips on icy paths in winter.

Frozen shoulder (adhesive capsulitis) is a painful, persistent stiffness of the shoulder joint, where the tissue around the joint becomes thickened and tight. It often has no obvious trigger. It tends to go through three stages:

• Freezing: the shoulder aches and becomes increasingly painful, often worse at night and when lying on that side
• Frozen: the pain usually eases a little, but the stiffness dominates and everyday tasks such as reaching behind you or overhead become difficult
• Thawing: movement gradually returns and any remaining pain fades

The stages vary a lot from person to person, and the whole process can take a year or two. It is most common between roughly 40 and 65.

• Moving your arm with help: with a rotator cuff problem it can often be lifted further by someone else, though it may be painful. With frozen shoulder it is stiff in every direction, even with help.
• Main problem: rotator cuff problems tend to cause pain and weakness when you use the arm. Frozen shoulder causes pain and a steady loss of movement.
• Onset: rotator cuff problems often follow a change in activity or a fall. Frozen shoulder often creeps in with no clear reason.
• Night pain: common with both.

You can't reliably work it out yourself. Neck problems and other conditions can also cause pain that feels like it comes from the shoulder, which is another reason to get it assessed.

For most people with rotator cuff related shoulder pain, a graded exercise programme is the recommended first step. A well known review of the research by physiotherapist Jeremy Lewis concluded that a well constructed exercise approach gives at least equivalent results to surgery for impingement type pain, rotator cuff tendinopathy, partial tears and tears that were not caused by a sudden injury. The same review was honest that outcomes can be incomplete and symptoms can come back.

There is also a note of caution. A recent systematic review and meta-analysis, searching studies up to December 2025, found that exercise did not clearly beat other non-surgical treatments in the short term, although the certainty of the evidence was low. The practical lesson is that no single exercise or treatment is magic. What matters is a plan built around you: adjusting what aggravates the shoulder without stopping completely, progressively strengthening the rotator cuff and shoulder blade muscles, hands on treatment to ease pain where it helps, and advice on sleep and work.

Surgery is usually only considered for certain tears, such as large tears after a sudden injury, or when a good rehab programme hasn't helped.

Treatment depends on the stage. In the painful early phase the aim is to calm things down and keep the shoulder moving gently within comfort, because forcing stretches can make it worse. As it stiffens, the focus moves towards steadily regaining movement and function. Your GP or a specialist may discuss options such as a steroid injection if pain is severe, and a physio can explain these and refer you on where appropriate. Most people improve, but it can take a long time, so the right plan and support early on makes a big difference to how manageable it feels.

Book a physio if your shoulder pain hasn't started to settle after a week or two, is waking you at night, is stopping you lifting your arm, or follows a fall or a heavy lift. You don't need a GP referral.

Some symptoms need urgent medical attention rather than a physio appointment. Call 999 or go to A&E if shoulder or arm pain comes with chest pain, shortness of breath, sweating or pain spreading to your jaw. Go to A&E or call NHS 111 if you have severe pain after a fall or accident, an obvious deformity or you can't move your arm at all, a hot, red, swollen joint with a fever, or new numbness or weakness in your arm or hand.

A first session usually includes a full history, a check of how your shoulder, neck and upper back move, strength testing, a clear explanation of what is going on, and the start of treatment where appropriate. You will leave with a plan and exercises matched to the stage and cause of your problem, which we adjust as you improve. If something needs further investigation, we will refer you on. Our Shoulder Pain & Rotator Cuff Injuries service covers what we treat, and you can read more about what to expect from a physio. We treat shoulder problems for people across Richmond, Catterick Garrison, Northallerton, Darlington and the surrounding areas.