Horrible arthritic reaction 8 days after the first shot/could not move/could not move arms away from body; hurt all over body; Achy Arm after first dose; Fever after first dose; This spontaneous case was reported by a consumer and describes the occurrence of ARTHRITIS (Horrible arthritic reaction 8 days after the first shot/could not move/could not move arms away from body), PAIN IN EXTREMITY (Achy Arm after first dose), PYREXIA (Fever after first dose) and MYALGIA (hurt all over body) in a 59-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     The patient's past medical history included Pain (used to have little pain).    On 03-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 03-Apr-2021, the patient experienced PAIN IN EXTREMITY (Achy Arm after first dose) and PYREXIA (Fever after first dose). On 11-Apr-2021, the patient experienced ARTHRITIS (Horrible arthritic reaction 8 days after the first shot/could not move/could not move arms away from body) and MYALGIA (hurt all over body). The patient was treated with PREDNISONE for Pain, at an unspecified dose and frequency; PARACETAMOL (TYLENOL [PARACETAMOL]) for Pain, at an unspecified dose and frequency and MELOXICAM for Pain, at an unspecified dose and frequency. On 05-Apr-2021, PAIN IN EXTREMITY (Achy Arm after first dose) and PYREXIA (Fever after first dose) had resolved. At the time of the report, ARTHRITIS (Horrible arthritic reaction 8 days after the first shot/could not move/could not move arms away from body) had not resolved and MYALGIA (hurt all over body) outcome was unknown.        mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was withdrawn on an unknown date.       Patient used to have little pain from time to time which he never needed medications or doctor's visit.  Concomitant product use was not provided by the reporter.  It was reported that patient woke up and could not move and had horrible arthritic reaction which include inability to move arms away from body, hurt all over body, and could not stand up.  Patient reported that MD keeps repeating Prednisone and if prednisone goes off, the pain comes back. Rheumatologist declined patient's request for a second dose of Moderna COVID-19 vaccine. Patient took J&J COVID 19 vaccine for his second dose on 12-Jun-2021. The J&J COVID-19 Vaccine didn't made the arthritis worst or better.  This case concerns a 59-year-old male patient with no medical history, who experienced the unexpected non-serious adverse event of special interest of Arthritis. The events occurred in 9 days after receiving the first dose of mRNA-1273 Vaccine. As reported, the patient was treated with Prednisone, Paracetamol and Meloxicam for the pain, the patient's Rheumatologist declined his request for a second dose of Moderna COVID-19 vaccine thus He took J&J COVID 19 vaccine for his second dose. It was reported that the outcome of the event has not resolved. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.; Sender's Comments: This case concerns a 59-year-old male patient with no medical history, who experienced the unexpected non-serious adverse event of special interest of Arthritis. The events occurred in 9 days after receiving the first dose of mRNA-1273 Vaccine. As reported, the patient was treated with Prednisone, Paracetamol and Meloxicam for the pain, the patient's Rheumatologist declined his request for a second dose of Moderna COVID-19 vaccine thus He took J&J COVID 19 vaccine for his second dose. It was reported that the outcome of the event has not resolved. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.