Written by Zita Sham, Fairuuz Saleh and Shiv Mohan Banka, Principal Physiotherapists at Phoenix Rehab.Clinically reviewed by Louise Yow, Principal Physiotherapist & Director, AHPC A1300363H.Last reviewed 8 October 2026.
You can handle the daytime. It is the night that breaks people.
You roll onto that side in your sleep and wake with a pain that goes straight to the bone. You lie there at 2am counting the hours until the alarm. Then you sit on the edge of the bed and try to find a position where the arm does not hurt. There isn’t one.
The words people type at that hour are short. Shoulder frozen. Arm stuck. Cannot sleep.
Frozen shoulder is one of the few shoulder problems that gets steadily worse for months before it starts getting better. Nobody warns you about that. You keep waiting for it to turn the corner the way a strained muscle does, it does not, and somewhere around month three you start wondering if something is seriously wrong with you.
Usually nothing is. But what decides how the next year goes is knowing which stage you are in right now, because the right treatment in one stage is the wrong treatment in another.
What frozen shoulder actually is
The medical name is adhesive capsulitis.
Your shoulder ball sits inside a socket, and wrapped around that joint is a bag of soft tissue called the capsule. Think of a thin, stretchy sleeve holding the joint together. In a healthy shoulder that sleeve is loose and roomy. It has to be, because your shoulder moves in more directions than any other joint you own.
In frozen shoulder, that sleeve becomes inflamed, then thickens, then tightens down onto the joint like a shrunken jumper. The roomy pocket at the bottom of the joint, the bit that lets you reach overhead, shrinks away.
That is why pain and stiffness feel like two different problems arriving together. The inflammation makes it ache and burn and wake you at night. The thickening stops the arm moving. Early on, pain leads. Later, stiffness leads.
Here is the part that catches people out. The muscles are fine. The tendons are usually fine. Your arm is not weak the way a torn muscle is weak. It simply cannot travel past the point where that sleeve runs out of slack. You push, and something firm stops you.
How to tell if this is what you have
The pattern is fairly distinctive.
It came on for no good reason. Most people cannot point to an injury. No fall, no lifting accident, no bad tackle. It started as a niggle in the upper outer arm and quietly got worse over weeks.
The pain lives in your upper arm, not your shoulder tip. People point to a spot halfway down the outside of the arm, near where a shirt sleeve ends.
Night pain is the signature. You cannot lie on that side. You cannot get comfortable on the other side either, because the arm hangs forward and pulls. Many people end up sleeping propped on the sofa or with a stack of pillows under the arm. If you are reading this at 3am, this line is why.
Everyday movements have quietly become impossible. Reaching into the back seat of the car. Fastening a bra. Pulling a wallet from a back pocket. Putting on a jacket. Washing your hair. These are the ones people mention first, because they are the ones that make you feel old.
The one test that separates it from a rotator cuff problem
Tuck your elbow against your side and keep it there. Bend the elbow to ninety degrees so your forearm points straight ahead, like you are holding a tray. Now rotate the forearm outwards, away from your body, keeping the elbow glued to your ribs. Good arm first. Then the sore one.
That movement is called external rotation. In frozen shoulder it is usually the first movement to go and the most obviously restricted. The sore arm may travel half as far as the good one, or barely at all, and it stops at a hard wall rather than fading out in pain.
Now the key detail. Ask someone to gently move your arm through that same rotation while you relax completely. If it is frozen shoulder, it still will not go. The restriction is in the joint itself, so relaxing changes nothing.
With a rotator cuff problem the picture is usually different.
Pain limits you, but when the muscle relaxes and someone else moves the arm, more range is available. Cuff problems also tend to hurt on specific actions, particularly lifting the arm out to the side, and they often follow a specific incident.
This is a pattern, not a diagnosis. A cuff tear and a stiffening capsule can sit in the same joint. But if your external rotation has collapsed and the arm will not move even when you fully relax, take that finding to a clinician.
What it is not
- Pain that starts in the neck. It can sit in the shoulder and upper arm and feel identical. But neck problems usually change with head position, and they do not take away external rotation. If you also get pins and needles or numbness down the arm, our cervical radiculopathy page covers that pattern.
- Shoulder arthritis. Also stiff and also loses external rotation, but usually in an older group, often with grinding, and it shows on an X-ray.
What causes it
Honest answer first. In a lot of cases nobody knows. It arrives in a healthy shoulder for no reason anyone can identify, which is deeply unsatisfying when you are the one it happened to. What we do know is that certain things make it far more likely.
Diabetes is the big one. People with diabetes develop frozen shoulder considerably more often than people without it, they tend to have a more stubborn course, and both shoulders are more likely to be affected over time.
That matters in Singapore, because diabetes is common here and a meaningful number of people living with it have not been diagnosed yet. Our physios have seen more than one person come in for a stiff shoulder and leave with a recommendation to get their blood sugar checked.
Thyroid conditions, particularly an underactive thyroid, are also associated with it. So is a period of the arm being still, after a fracture, after a stroke, or after surgery that kept the arm in a sling.
Age and sex. It shows up most often in middle age, and more often in women than in men.
Minor injury that led to protecting the arm. A small strain, the arm gets guarded for a couple of weeks, and the capsule starts tightening behind the scenes. The original injury heals. The stiffness stays and keeps building.
The Singapore angle people ask about most is desk work. Long static hours at a laptop do not cause frozen shoulder. What they do is hide it. When your day requires almost no overhead reaching, you can lose a third of your range before anything forces you to notice. Then you reach for a bag in the overhead compartment and discover how far it has already gone.
When you need to get this looked at
Stiffness that has been building for four to six weeks and is starting to interfere with dressing, driving or sleeping deserves a proper assessment. Not because something terrible is happening, but because the wrong approach early on genuinely prolongs things.
Trajectory matters more than the pain level on any single day. A shoulder slowly improving week on week is usually fine to keep watching. A shoulder measurably stiffer this month than last is telling you something.
See a doctor promptly if any of the following apply:
- The shoulder is hot, red and swollen and you feel unwell or feverish.
- You had a significant fall or accident and you now cannot lift the arm at all.
- There is true weakness rather than pain, meaning the arm gives way or you cannot hold a light object.
- You have numbness, pins and needles or weakness traveling down into the hand.
- You have a history of cancer, or you have unexplained weight loss along with the pain.
- The pain is deep in the chest or comes with breathlessness, sweating or nausea. That needs emergency care, not a physiotherapist.
None of these are typical for frozen shoulder. That is exactly why they are worth ruling out.
What happens if you leave it
Two truths sit side by side here.
The reassuring one is that this condition is usually self-limiting. Left completely alone, the capsule does eventually settle and loosen for most people. It is not a progressive disease. It does not destroy the joint. You are not going to end up with a permanently useless arm.
The harder one is the timeline. This is measured in months and often in years, not weeks. And a minority of people are left with some permanent loss of range at the end of it, usually external rotation, usually enough to notice but not enough to stop them living normally.
There is also a cost to waiting that has nothing to do with the capsule. Nine months of broken sleep changes a person. Nine months of not using the arm properly leaves the shoulder blade muscles weak and the neck and elbow doing work they were never meant to do. People stop swimming, stop the gym, stop badminton, and the deconditioning takes longer to fix than the shoulder did.
How frozen shoulder and treatment change by stage
Everything about frozen shoulder and treatment depends on one question. Which stage are you in? Get that wrong and good treatment becomes bad treatment. There are three stages and they run in order.
Stage one: freezing
Pain leads. Range is starting to go, but what dominates is the ache, the night pain, and the sharp catch when you move quickly or get bumped. Typically six weeks to nine months.
What helps here is settling the pain down, not forcing range. Gentle movement within a comfortable zone. Sleep positioning. Pain relief discussed with a doctor. This is also the stage where a corticosteroid injection tends to be most useful, because there is active inflammation to calm.
What hurts here is hard stretching. The capsule is angry. Pushing it hard makes it angrier, the pain drives more guarding, and the guarding drives more stiffness. If an appointment leaves you sore for hours or ruins your night, it was too much.
Stage two: frozen
Pain quietly reduces. Stiffness takes over. You sleep a bit better, but the arm barely moves. Often four to twelve months.
This is where stretching earns its place. The capsule is less inflamed and more willing to be lengthened. Sustained, frequent mobility work through end range is the main job now, along with keeping the shoulder blade and cuff muscles working so they are ready later.
Stage three: thawing
Range slowly returns, usually in a stuttering way rather than a clean line. Six months to two years from the start of this stage.
This is the loading stage. Range that comes back without strength behind it does not feel like your shoulder. Strengthening through the newly available range is what turns “it moves again” into “I trust it again”.
The rest of the landscape
Corticosteroid injection. An anti-inflammatory placed into or around the joint by a doctor. It targets pain rather than stiffness, and the evidence is strongest when it is given earlier in the painful stage. It is not a cure. It is a window, and what you do with that window matters. The same logic applies to an injection like PRP, which is a different treatment with different evidence.
Hydrodilatation. A doctor injects fluid into the joint under imaging guidance to stretch the tightened capsule from the inside, usually with a steroid included. Some people get a useful jump in range from it.
Manipulation under anesthesia. You are put to sleep and the shoulder is moved through its range to free the tight tissue. Used in a small number of cases that stay stuck.
Arthroscopic capsular release. Keyhole surgery where the surgeon cuts the tightened capsule to free the joint. Also reserved for stubborn cases, and the rehabilitation afterwards is a serious commitment.
Those decisions belong to you and your surgeon. Physiotherapy is not an alternative to a procedure you need and we will never tell you it is. What it does is get the most out of whichever path you take, and keep the range won after an injection or a release.
If you are unsure which stage you are in, that is a five minute conversation. WhatsApp 8336 6009 and ask.
Exercises for frozen shoulder, and when each one is appropriate
Read the stage note on each one. The exercises for frozen shoulder that help in month eight can set you back in month two. These are general guidance. An assessment comes first, because a stiff painful shoulder is not always this condition.
The discomfort rule. Work into a stretch you would rate three or four out of ten. Pulling and tolerable. Never sharp. It should ease within a minute of stopping, and you should not be more sore two hours later or worse that night. If any of those fail, you went too far.
1. Pendulum swings. All stages, especially freezing. Lean forward, good hand on a table, let the sore arm hang. Swing it in small circles using your body weight rather than shoulder muscles. Twenty seconds each direction, then small forward and back swings. Three to four rounds, two or three times a day. A calming exercise, not a stretch.
2. Table slides. All stages. Sit at a table, forearm on a towel, palm down. Slide the hand forward, letting your trunk lean with it, until you feel the stretch. Hold five seconds, slide back. Ten to fifteen repetitions, twice daily. The table carries the arm, which is why this is tolerable early on.
3. Wand assisted external rotation. All stages. The most important one. Lie on your back or stand with the sore elbow tucked at your side and bent to ninety degrees. Hold a broom handle across your body with both hands. Use the good arm to gently push the sore forearm outwards. Keep the elbow pinned to your ribs. Hold ten to thirty seconds, five to ten repetitions, two to three times a day. This is the movement you lose first and the one most worth defending.
4. Cross body adduction stretch. Frozen and thawing stages. Bring the sore arm across your chest, use the other hand at the upper arm to draw it further across, shoulder down rather than shrugged. Hold twenty to thirty seconds, three to five repetitions, once or twice a day.
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5. Sleeper stretch. Thawing stage, or frozen stage only if guided. Not in the freezing stage. Lie on the sore side, shoulder and elbow bent to ninety degrees, forearm pointing at the ceiling. Use the other hand to press the forearm gently down towards the bed. Hold twenty to thirty seconds, three repetitions. A real caveat. You are lying directly on the painful shoulder and pressing into it. Done too early or too hard it irritates the joint and can aggravate a cuff problem if one is present. If this one stings, leave it.
6. Isometric holds. Frozen and thawing stages. Stand at a wall, elbow at your side, press the back of the hand outwards into the wall at about thirty percent effort. Hold five to ten seconds, five repetitions. No movement, just tension. This keeps the cuff switched on while range is limited.
Frequency beats intensity. Little and often, every day, for months.
What recovery actually looks like
Most people get there. That is the honest headline. The path is long and it is not a straight line.
Full resolution commonly takes one to three years from the first symptom. Treatment shortens the miserable parts and improves the endpoint rather than skipping the process.
Some things reliably make it slower. Diabetes, particularly when blood sugar control is poor. A long delay before anyone worked out what was going on. Months of aggressive stretching through the painful stage. And a second shoulder starting up while the first is still recovering.
What our physios watch for is a plateau that lasts. Slow progress is normal here. Three months of nothing changing is a reason to ask a doctor whether an injection, hydrodilatation or a surgical opinion should come into the picture.
Getting assessed at Phoenix Rehab
The first appointment is mostly questions and measurement. When did it start. What hurts at night. What can you no longer do. Then our physios measure your range in each direction against the other side, check what happens when you relax and someone else moves the arm, and test the rotator cuff separately.
The useful answer out of that is which stage you are in and what it means for the next eight weeks. If the picture does not fit frozen shoulder, or if something needs imaging or a doctor’s opinion first, we will tell you plainly and help you get there. We work alongside orthopedic surgeons across Singapore and we are comfortable saying when a shoulder needs one.
You will leave with two or three exercises, done correctly, with a clear rule on how far into discomfort to go. Not a printed sheet of fifteen.
Frequently asked questions
How long does frozen shoulder last? Usually one to three years from the first symptom, moving through three stages. Treatment does not skip the stages. It shortens the painful stage, keeps you sleeping, and improves how much range you finish with. Most people are back to normal activity long before the last few degrees return.
Should I push through the pain to get my range back? Not in the painful early stage. Hard stretching while the capsule is inflamed makes the pain worse and usually the stiffness too. Work into mild discomfort, around three or four out of ten, that settles within a minute. Once the pain stage passes, sustained stretching becomes the main tool.
Is frozen shoulder the same as a rotator cuff tear? No. A cuff tear is tendon damage and typically causes weakness and pain on specific movements, with more range available when the arm is fully relaxed. Frozen shoulder is a tightened joint capsule, so the arm will not move even when someone else moves it. They can occur together.
Why does it hurt so much more at night? You lose the distraction of the day, inflammatory chemicals build up in a joint that has not moved for hours, and lying down puts the capsule in positions it does not tolerate. Sleeping on your back with a pillow under the elbow, or on the good side hugging a pillow, usually helps most.
Does a steroid injection cure frozen shoulder? It does not cure it. It reduces the inflammation and the pain, which is most valuable during the painful early stage. The range that reduced pain gives you still has to be worked on and kept. Injections and physiotherapy do different jobs and work best together, not as alternatives.
Can frozen shoulder happen in the other shoulder too? Yes, in a proportion of people, usually after the first one has settled. It is more likely if you have diabetes. The same shoulder rarely freezes twice.
Is it safe to keep going to the gym? Usually yes, with changes. Lower body, core and the unaffected arm can carry on almost normally. Avoid overhead pressing and anything that yanks the shoulder. Ask your physiotherapist to adapt your program rather than stopping altogether, because losing general fitness over a year costs you more than the shoulder does.
Do I need an MRI? Often not. Frozen shoulder is largely diagnosed from your history and from how the shoulder moves, particularly the loss of external rotation. Imaging becomes useful when the picture is unclear, when there was a real injury, when there is true weakness, or when a doctor is planning a procedure.
The bigger picture
The point is not the shoulder. The point is sleeping through the night again. Reaching into the back seat without bracing. Swimming, lifting your kid, serving in badminton, putting a suitcase overhead without that flinch of doubt. Keeping a body you can rely on into your sixties and seventies, because the arm you stop using is the arm you slowly lose.
If your shoulder has been getting stiffer instead of better, come and get it looked at properly.
Had an injection?
The injection took the edge off. The shoulder still stops at shoulder height.
A steroid injection or hydrodilatation settles the pain of a frozen shoulder. It does not stretch the capsule. In a randomized trial, an injection followed by supervised physiotherapy improved range of movement faster than the injection on its own (Carette and colleagues, Arthritis and Rheumatism, 2003).
The low-pain weeks after the injection are the window for range work, measured in degrees at each visit.
Where are you with this right now?
1. It is settling on its own
Many shoulder problems settle over weeks to months. Night pain that slowly becomes less frequent, and reach that slowly returns, are the usual pattern. If you are reaching higher this month than last, and sleeping better, it is on the normal course. You do not need us for this, and we would rather say so.
2. It has stopped improving
You put your shirt on that arm first. The top shelf belongs to someone else now. You have stopped reaching behind you without thinking.
Reach comes back before strength does. A shoulder that goes overhead but cannot hold anything there is halfway, not finished. That is the gap worth measuring, and it is not measured by how you feel on the day.
The Stalled Recovery Review is three appointments over three weeks with the same therapist, because what a joint does under load cannot be read in one visit. The first finds what is limiting it. The next two measure how it responds. $690, nett, no GST, which is three appointments at $230.
3. You have had surgery, or you have a date
Recovery after an operation has a shape, and knowing which stage you are in tells you whether you are on it. See the Rotator Cuff Repair Recovery Program, or shoulder physiotherapy if you are not sure which applies to you.
All of it runs on the same four stages. The Phoenix Recovery Protocol explains what each stage works on and what you have to meet to move up. No referral needed to start.
Next step
Find out which stage you are in
Pain is the first thing to leave. Movement and strength are the last things trained back, and most people stop before that part is done. One Assessment and Treatment is a single 45-minute appointment at $230, nett, no GST. Your therapist finds what is actually limiting you, treats it in the same appointment, and you leave with your current stage and a written plan.
Prefer to phone? Each of our five clinics has its own number on the clinics page. No referral needed to book.
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