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Frozen shoulder is a condition where the shoulder becomes painful and hard to move. The condition is sometimes called adhesive capsulitis.
The shoulder is a joint that is made up of many parts. These parts allow you to raise, rotate, and swing your arm. The parts of a normal shoulder are:
Humeral head. The ball at the top of the upper arm bone (humerus).
Scapula. The shoulder blade.
Glenoid. The shallow socket on the scapula. (The humeral head rests on the glenoid.)
Capsule. A sheet of tough tissue that encloses the joint and joins the ball to the socket.
With frozen shoulder, the capsule thickens, and shrinks and pulls in (contracts). It is not clear why this happens. It may be from swelling and irritation, or from scar tissue forming. Over time, this may result in pain, stiffness, and loss of movement in the shoulder.
Experts don’t know for sure why frozen shoulder occurs. Some things can make the condition more likely. These include:
Being a woman
Being 40 to 60 years old
Having certain health conditions, such as diabetes or thyroid disease
Taking certain medicines
Not using the shoulder for a prolonged period of time, such as after an injury or surgery
Frozen shoulder typically occurs in 3 stages. Each stage will vary, but often lasts a few months or longer:
Freezing stage. The shoulder is very painful. Pain often gets worse when moving your arm and at night during sleep. The shoulder gradually becomes stiffer.
Frozen stage. The shoulder is very stiff and hard to move. Pain may be less than in the first stage. It may be hard to do daily tasks, such as dressing or bathing.
Thawing stage. Pain and stiffness slowly get better. In time, normal or almost normal use of the shoulder returns.
Most cases of frozen shoulder get better, even with no treatment. Treatment is done to help speed healing and help regain as much joint movement as possible. The best course of treatment will depend on your needs. It may include one or more of the following:
Prescription or over-the-counter pain medicines. These help relieve pain and reduce swelling.
Stretching exercises. These help restore movement to the shoulder. You may do them on your own or under the care of a physical therapist.
Cortisone shots. These are given into your shoulder joint. They can’t cure frozen shoulder. But they can help give short-term relief from symptoms and allow you to do exercises without too much pain.
Cold packs and heat packs. These can help relieve symptoms.
Keep in mind that getting better is a slow process. It can take a year or longer. If your shoulder doesn’t get better on its own in this time, you may need surgery. This is done to loosen the tight tissues in the shoulder joint.
Call your healthcare provider right away if you have any of these:
Fever of 100.4°F (38°C) or higher, or as directed
Symptoms that don’t get better, or get worse
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