Frozen shoulder/limited mobility in their left arm; not able to sleep that night because of the pain; immediate effects/some issues; left shoulder started to hurt, and was progressively getting worse / left shoulder continue to be painful.; left  arm continue to be painful; This spontaneous case was reported by a consumer and describes the occurrence of VACCINATION COMPLICATION (immediate effects/some issues), INSOMNIA (not able to sleep that night because of the pain), PERIARTHRITIS (Frozen shoulder/limited mobility in their left arm), ARTHRALGIA (left shoulder started to hurt, and was progressively getting worse / left shoulder continue to be painful.) and VACCINATION SITE PAIN (left  arm continue to be painful) in a 52-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 015M20A and 027L20A) for COVID-19 vaccination.     No Medical History information was reported.   On 12-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 09-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 09-Feb-2021, the patient experienced VACCINATION COMPLICATION (immediate effects/some issues), ARTHRALGIA (left shoulder started to hurt, and was progressively getting worse / left shoulder continue to be painful.) and VACCINATION SITE PAIN (left  arm continue to be painful). On 07-Jun-2021, the patient experienced INSOMNIA (not able to sleep that night because of the pain). On 08-Jun-2021, the patient experienced PERIARTHRITIS (Frozen shoulder/limited mobility in their left arm). The patient was treated with TRAMADOL for Adverse event, at an unspecified dose and frequency and GABAPENTIN for Adverse event, at an unspecified dose and frequency. At the time of the report, VACCINATION COMPLICATION (immediate effects/some issues), INSOMNIA (not able to sleep that night because of the pain) and PERIARTHRITIS (Frozen shoulder/limited mobility in their left arm) outcome was unknown and ARTHRALGIA (left shoulder started to hurt, and was progressively getting worse / left shoulder continue to be painful.) and VACCINATION SITE PAIN (left  arm continue to be painful) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 20-Jul-2021, Magnetic resonance imaging: frozen shoulder and limited mobility in their left (abnormal) frozen shoulder and limited mobility in their left arm. Showed thickened IGHL suggestive of adhesive capsulitis.         Orthopedic surgeon recommended surgery.  Concomitant medication information was not provided by the reporter.  Treatment information was not provided by the reporter.  Reportedly, patient MRI procedure was MRI shoulder left W/O contrast and technique was comprehensive examination was performed without intravenous gadolinium contrast utilizing a variety of imaging planes and imaging parameters to optimize visualization of suspected pathology.  This case concerns a 52-year-old, male patient with no medical history reported, who experienced the unexpected non-serious adverse event of special interest of periarthritis. The event occurred approximately 4 months after the first dose of Moderna COVID-19 vaccine. The rechallenge was not applicable since the event occurred after the second odse. The benefit-risk relationship of Moderna COVID-19 vaccine is not affected by this report.   Most recent FOLLOW-UP information incorporated above includes: On 31-Oct-2021: Follow up was received and updated patient MRI results and MRI start date.; Sender's Comments: This case concerns a 52-year-old, male patient with no medical history reported, who experienced the unexpected non-serious adverse event of special interest of periarthritis. The event occurred approximately 4 months after the first dose of Moderna COVID-19 vaccine. The rechallenge was not applicable since the event occurred after the second odse. The benefit-risk relationship of Moderna COVID-19 vaccine is not affected by this report.