arthritis; knee pain It was very painful and lasted about a month.; This spontaneous case was reported by a consumer and describes the occurrence of ARTHRITIS (arthritis) and ARTHRALGIA (knee pain It was very painful and lasted about a month.) in a 72-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 071F21A, 030M20A and 032M20A) for COVID-19 vaccination.     Concurrent medical conditions included Allergy (codeine). Concomitant products included ATORVASTATIN for Blood pressure abnormal.   On 09-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 09-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 03-Nov-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 07-Nov-2021, the patient experienced ARTHRALGIA (knee pain It was very painful and lasted about a month.) (seriousness criterion medically significant). On an unknown date, the patient experienced ARTHRITIS (arthritis) (seriousness criterion medically significant). At the time of the report, ARTHRITIS (arthritis) outcome was unknown and ARTHRALGIA (knee pain It was very painful and lasted about a month.) was resolving.            The patient never had COVID + test or diagnosis. The patient never experienced this pain in the knee in the past medical history. The patient did not take any vaccines within 1 month prior to Moderna COVID-19 vaccine. A week after getting the Moderna booster shot, patient began to feel pain in his left knee (this was on 07 Nov 2021). It was very painful and lasted about a month. Afterwards the pain continued but it was not as bad. Now, the pain has come back (about 3 weeks ago, in the beginning of February 2022). He went to the doctor who sent to an orthopedic specialist. The specialist gave him an injection in the knee for the pain, and now it had gotten better because of that. The patient guesses it was cortisone or Ibuprofen. The patient did not experienced a similar event in the past Company Comment: This spontaneous case concerns a 72 year old male with no relevant medical history reported , who experienced Serious ( medically significant )  , unexpected, AESI event of arthritis and serious , unexpected , event of arthralgia which occurred 4 days post vaccination with the 3rd dose of mRNA-1273 vaccine . This patient experienced pain on his left knee that lasted for a month but later on decreased in severity . On Feb. 2022 he went to see an orthopedic specialist who gave him  an injection in the knee for the pain and was relieved with the medication. The patient reported that the medication was either cortisone or ibuprofen . At the time of this report the events were reported as resolving . The age of this patient may be considered as a confounder for this case ( ageing can cause joint pains, bony changes ) . The benefit -risk relationship of mRNA -1273 ( Moderna Covid 19 Vaccine) is not affected by this report.; Sender's Comments: This spontaneous case concerns a 72 year old male with no relevant medical history reported , who experienced Serious ( medically significant )  , unexpected, AESI event of arthritis and serious , unexpected , event of arthralgia which occurred 4 days post vaccination with the 3rd dose of mRNA-1273 vaccine . This patient experienced pain on his left knee that lasted for a month but later on decreased in severity . On Feb. 2022 he went to see an orthopedic specialist who gave him  an injection in the knee for the pain and was relieved with the medication. The patient reported that the medication was either cortisone or ibuprofen . At the time of this report the events were reported as resolving . The age of this patient may be considered as a confounder for this case ( ageing can cause joint pains, bony changes ) . The benefit -risk relationship of mRNA -1273 ( Moderna Covid 19 Vaccine) is not affected by this report.