How can I tell if I have frozen shoulder?

Diagnosing shoulder periarthritis—commonly referred to as “frozen shoulder” or adhesive capsulitis—requires a careful clinical evaluation, as its symptoms overlap with several other shoulder conditions. The hallmark features include progressive, painful restriction of both active and passive range of motion in all planes (flexion, abduction, external rotation, and internal rotation), typically developing over weeks to months. Pain is often dull, aching, and worse at night or with movement, especially during the “freezing” phase. A thorough physical examination is essential: clinicians assess for global loss of motion—not just in one direction—and confirm that passive motion is equally limited as active motion, which helps differentiate it from rotator cuff tendinopathy or impingement, where passive motion is usually preserved.

Imaging plays a supportive role. While X-rays are typically normal in pure adhesive capsulitis (helping rule out arthritis, calcific tendinitis, or bony abnormalities), MRI or ultrasound may be used to exclude structural pathology such as full-thickness rotator cuff tears, labral injuries, or inflammatory arthropathies. Blood tests are not diagnostic but may be considered if systemic inflammation or autoimmune disease is suspected—particularly when presentation is atypical (e.g., rapid onset, bilateral involvement, or associated constitutional symptoms).

It’s important to recognize that true idiopathic adhesive capsulitis most commonly affects individuals aged 40–60 years, with a higher prevalence in people with diabetes mellitus, thyroid disorders, Parkinson disease, or a history of prolonged shoulder immobilization. The natural course is typically divided into three overlapping phases: freezing (pain dominant, progressive stiffness), frozen (less pain but marked stiffness), and thawing (gradual return of motion). Diagnosis is primarily clinical; no single test confirms it definitively. Therefore, accurate diagnosis hinges on integrating history, physical findings, and judicious use of imaging to exclude mimics—ensuring appropriate management and avoiding unnecessary interventions.