It seems reactive arthritis & like his immune system is reactive in those areas.; pain an an old inguinal hernia spot; can't brush his hair or teeth in the morning because it's so painful; mild, manageable back pain; felt terrible/muscular & joint pain which have continued/shoulder, elbow, & hip pain/.He has trouble picking anything from the floor due to the hip pain.; felt terrible/muscular & joint pain which have continued; a fever of 101.7F which went away after 24 hours; This spontaneous case was reported by a consumer and describes the occurrence of ARTHRITIS REACTIVE (It seems reactive arthritis & like his immune system is reactive in those areas.) in a 70-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 035C21A, 018B21A and 005C21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Inguinal hernia (old inguinal hernia spot).   On 06-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 04-May-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 16-Dec-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In December 2021, the patient experienced PYREXIA (a fever of 101.7F which went away after 24 hours). On an unknown date, the patient experienced ARTHRITIS REACTIVE (It seems reactive arthritis & like his immune system is reactive in those areas.) (seriousness criterion medically significant), HERNIA PAIN (pain an an old inguinal hernia spot), PAIN (can't brush his hair or teeth in the morning because it's so painful), BACK PAIN (mild, manageable back pain), ARTHRALGIA (felt terrible/muscular & joint pain which have continued/shoulder, elbow, & hip pain/.He has trouble picking anything from the floor due to the hip pain.) and MYALGIA (felt terrible/muscular & joint pain which have continued). In December 2021, PYREXIA (a fever of 101.7F which went away after 24 hours) had resolved. At the time of the report, ARTHRITIS REACTIVE (It seems reactive arthritis & like his immune system is reactive in those areas.), HERNIA PAIN (pain an an old inguinal hernia spot), PAIN (can't brush his hair or teeth in the morning because it's so painful) and BACK PAIN (mild, manageable back pain) outcome was unknown and ARTHRALGIA (felt terrible/muscular & joint pain which have continued/shoulder, elbow, & hip pain/.He has trouble picking anything from the floor due to the hip pain.) and MYALGIA (felt terrible/muscular & joint pain which have continued) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In December 2021, Body temperature: 101.7f (High) fever of 101.7F.         No concomitant medications reported by reporter No treatment medications reported by the reporter. Company comment This case concerns a 70-year-old male patient, with no reported relevant medical history, who experienced the unexpected serious event of ARTHRITIS REACTIVE (AESI). The event occurred on an unknown day after the administration of the third dose of mRNA-1273 vaccine. Patient describes that it seems reactive arthritis & like his immune system is reactive in those areas. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.; Sender's Comments: This case concerns a 70-year-old male patient, with no reported relevant medical history, who experienced the unexpected serious event of ARTHRITIS REACTIVE (AESI). The event occurred on an unknown day after the administration of the third dose of mRNA-1273 vaccine. Patient describes that it seems reactive arthritis & like his immune system is reactive in those areas. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.