Causes of Frozen Shoulder
Causes of Frozen Shoulder The causes of frozen shoulder involve inflammation and thickening of the shoulder joint capsule, which restricts movement. Frozen shoulder can develop without an obvious reason (primary) or as a result of injury or medical conditions (secondary). Primary Frozen Shoulder In many cases, frozen shoulder occurs without any clear cause. This is known as idiopathic or primary frozen shoulder. It’s believed that: Inflammation causes the joint capsule to thicken and contract Adhesions (bands of scar-like tissue) form inside the joint Synovial fluid (which lubricates the joint) may be reduced Why this happens in otherwise healthy people remains unclear, but certain risk factors increase susceptibility. Secondary Frozen Shoulder This type develops following another condition or event that affects the shoulder: Shoulder injury or surgery – dislocations, fractures, or operations can lead to immobilisation Rotator cuff problems – such as tears or tendonitis Stroke – paralysis or reduced use of the arm may trigger stiffness Heart surgery – some people develop frozen shoulder after open-heart procedures Any situation that limits arm movement for a prolonged period can increase the risk of adhesive capsulitis. Medical Risk Factors Certain health conditions are strongly linked to frozen shoulder: Diabetes – one of the most significant risk factors; affects 10–20% of diabetics Thyroid disorders – both overactive and underactive thyroid conditions Parkinson’s disease – due to muscle stiffness and reduced mobility Cardiovascular disease People with autoimmune disorders or metabolic syndrome may also have an increased risk. Age and Gender Most common between ages 40 and 60 Women are affected more than men The non-dominant shoulder is often involved, though either side can be affected Causes of Frozen Shoulder Understanding the causes of frozen shoulder is essential for prevention, especially in people with diabetes or those recovering from upper body injuries or surgery. [Next: Symptoms of Frozen Shoulder →]









