severe arthritis; stiff left shoulder in the arm they got the injection in/She is stiff; uncomfortable night; Caller had a sleepless night/ Caller did not sleep that night/ every 2 to 3 hours they were awake/ uncomfortable night; The shoulder is uncomfortably sore/even their shoulder blades hurt/She has a lot of shoulder pain going all the way down her arm; This spontaneous case was reported by a patient and describes the occurrence of ARTHRITIS (severe arthritis), MUSCULOSKELETAL STIFFNESS (stiff left shoulder in the arm they got the injection in/She is stiff), DISCOMFORT (uncomfortable night), INSOMNIA (Caller had a sleepless night/ Caller did not sleep that night/ every 2 to 3 hours they were awake/ uncomfortable night) and ARTHRALGIA (The shoulder is uncomfortably sore/even their shoulder blades hurt/She has a lot of shoulder pain going all the way down her arm) in a 95-year-old female patient who received mRNA-1273.815 (SPIKEVAX 2023-2024) (batch no. 202F23A) for COVID-19 prophylaxis.     Previously administered products included for COVID-19 prophylaxis: Moderna (First dose, Batch/Lot number: 012L20A) on 12-Jan-2021, Moderna (Second dose, Batch/Lot number: 007M20A) on 10-Feb-2021, Moderna (Third dose, Batch/Lot number: 011F2114) on 23-Oct-2021, MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5) (Booster dose and Batch/Lot number: AS7143C) on 12-Oct-2022. Past adverse reactions to the above products included No adverse event with MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5), Moderna, Moderna and Moderna. Concurrent medical conditions included Allergy to antibiotic, Allergy to molds (mold mildew) and Seasonal allergy.    On 19-Sep-2023, the patient received fifth dose of mRNA-1273.815 (SPIKEVAX 2023-2024) (unknown route) 1 dosage form. On 19-Sep-2023, the patient experienced ARTHRITIS (severe arthritis), MUSCULOSKELETAL STIFFNESS (stiff left shoulder in the arm they got the injection in/She is stiff), DISCOMFORT (uncomfortable night), INSOMNIA (Caller had a sleepless night/ Caller did not sleep that night/ every 2 to 3 hours they were awake/ uncomfortable night) and ARTHRALGIA (The shoulder is uncomfortably sore/even their shoulder blades hurt/She has a lot of shoulder pain going all the way down her arm). At the time of the report, ARTHRITIS (severe arthritis), MUSCULOSKELETAL STIFFNESS (stiff left shoulder in the arm they got the injection in/She is stiff) and ARTHRALGIA (The shoulder is uncomfortably sore/even their shoulder blades hurt/She has a lot of shoulder pain going all the way down her arm) had not resolved and DISCOMFORT (uncomfortable night) and INSOMNIA (Caller had a sleepless night/ Caller did not sleep that night/ every 2 to 3 hours they were awake/ uncomfortable night) outcome was unknown.        For mRNA-1273.815 (SPIKEVAX 2023-2024) (Unknown), the reporter did not provide any causality assessments.   No concomitant medication was reported.  Patient did not receive any other vaccines in the 4 weeks prior to COVID-19 vaccine.  Caller stated that it was a very long needle and the pharmacist put it all the way in. Vaccine appeared to be attacking every arthritic joint they have their toes and feet. Caller had severe arthritis and that is what it was attacking, even their shoulder blades hurt. Caller had a sleepless night. Caller still had a stiff left shoulder in the arm they got the injection in. The shoulder was uncomfortably sore. Caller did not know if it was the way it was administered or the strength of the vaccine. Caller did not sleep that night. She did not take any medications. The way that it affected them was very uncomfortable that every 2 to 3 hours they were awake. They had a heating pad on it and it helped a little bit and not for long.  Upon follow-up, patient stated that she had an uncomfortable night after receiving the new Moderna COVID-19 vaccine. She was stiff, she had a lot of shoulder pain going all the way down her arm.  No treatment medication was reported.   Reporter did not allow further contact   Most recent FOLLOW-UP information incorporated above includes: On 22-Sep-2023: Live follow-up information received included an additional event.