I could barely lift my arm/ could barely move; I couldn't barely walk; it felt like my like hip was affected; my eyes are also tired; no energy; I feel like it affected the lymphatic system or the lymph nodes/ It feels like its inflamed a bit but it doesn't look swollen; feeling of being tired; arm is extremely sore/ extremely sensitive above the elbow; This spontaneous case was reported by a patient and describes the occurrence of MOBILITY DECREASED (I could barely lift my arm/ could barely move), GAIT INABILITY (I couldn't barely walk), MUSCULOSKELETAL DISCOMFORT (it felt like my like hip was affected), ASTHENOPIA (my eyes are also tired) and ASTHENIA (no energy) in a 71-year-old female patient who received mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     The patient had not received any other vaccines in the 4 weeks prior to COVID-19 vaccine.  The patient's past medical history included Breast cancer (15 years ago).    On 20-Nov-2023, the patient received sixth dose of mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (unknown route) .5 milliliter. On 21-Nov-2023, the patient experienced MOBILITY DECREASED (I could barely lift my arm/ could barely move), GAIT INABILITY (I couldn't barely walk), MUSCULOSKELETAL DISCOMFORT (it felt like my like hip was affected), ASTHENOPIA (my eyes are also tired), ASTHENIA (no energy), LYMPHADENITIS (I feel like it affected the lymphatic system or the lymph nodes/ It feels like its inflamed a bit but it doesn't look swollen), FATIGUE (feeling of being tired) and PAIN IN EXTREMITY (arm is extremely sore/ extremely sensitive above the elbow). At the time of the report, MOBILITY DECREASED (I could barely lift my arm/ could barely move), GAIT INABILITY (I couldn't barely walk), MUSCULOSKELETAL DISCOMFORT (it felt like my like hip was affected), ASTHENOPIA (my eyes are also tired), ASTHENIA (no energy), LYMPHADENITIS (I feel like it affected the lymphatic system or the lymph nodes/ It feels like its inflamed a bit but it doesn't look swollen) and FATIGUE (feeling of being tired) outcome was unknown and PAIN IN EXTREMITY (arm is extremely sore/ extremely sensitive above the elbow) had not resolved.        For mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (Unknown), the reporter did not provide any causality assessments.   No relevant concomitant medications were reported.  Patient had previously received Moderna doses 13-Jan-2021 039K202A, 10-Feb-2021 039Kk20A, 12-Apr-2022 005M21A, 04-Oct-2022 AS7147B, Moderna Bivalent 14-May-2023 AS7147B. The patient received the vaccine on 20-Nov-2023, around 6 PM and felt fine. The patient swims at the Y and does 50 laps a day and 21-Nov-2023, by the time patient got to Y she could barely move. She could barely lift her arm. Patient could not barely walk, it felt like her hip was affected. It was a feeling of being tired. She felt like it affected the lymphatic system or the lymph nodes and felt like it was inflamed a bit but it does not look swollen, her neck does not look swollen, but her arm was extremely sore, extremely sensitive above the elbow, her eyes were also tired. Spikevax blew up her lymphatic system. It was an earie feeling, mentally her brain even wanted her to go swimming even with no energy.   No treatment medication reported.   This case was linked to MOD-2023-750507 (Patient Link).