Frozen shoulder, also called adhesive capsulitis, is a condition where the shoulder capsule becomes tight, inflamed, and restricted. It can cause significant pain, sleep disruption, and loss of movement — often making ordinary tasks feel unexpectedly difficult.
Frozen shoulder affects the capsule that surrounds the shoulder joint. As the capsule becomes thicker and less flexible, the shoulder loses motion in multiple directions.
A key feature is that both active and passive motion become limited. In plain language: you cannot move it normally, and even someone else cannot easily move it for you.
The range you can reach under your own power. In frozen shoulder, lifting, rotating, and reaching all shrink — not because of weakness, but because the joint itself is restricted.
The range someone else can move your arm through. This is the telltale sign: in frozen shoulder, even an examiner cannot move the joint past its mechanical limit.
Many shoulder problems hurt but still allow someone else to move the arm. Frozen shoulder is different because the joint itself becomes mechanically restricted. That is why everyday movements can become so difficult:
Lifting the arm to a shelf, a light switch, or overhead in exercise becomes limited and painful.
Putting on clothing, fastening behind the back, and washing hair rely on rotation the capsule no longer allows.
Sleeping on the affected side or reaching into the back seat can trigger sharp, deep restriction.
Several other conditions can mimic some of the same symptoms. A proper assessment helps confirm the diagnosis and avoid pursuing the wrong treatment path.
If you suspect frozen shoulder or have already been diagnosed, the most useful next step is to understand your stage and compare reasonable treatment options.
Individual results vary. A specialist assessment is required before determining suitability for any treatment.
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