Frozen shoulder after COVID-19 vaccination: a systematic review of incidence and characteristics (tandfonline.com)

• 12 studies including 45 cases
• Predominantly middle-aged women
• Median onset 5 days post-vaccination

"This systematic review investigates the incidence and characteristics of frozen shoulder (adhesive capsulitis) following COVID-19 vaccination. Multiple cases were identified, typically occurring within days to weeks post-vaccination, more commonly in middle-aged women. Symptoms included shoulder pain and restricted range of motion. Evidence is based on case reports and series, precluding confirmation of causality but suggesting a potential signal. Clinicians should be vigilant when such presentations occur after vaccination."