more pronounced swelling in legs; weakness in her lower extremities; very weak; very difficult for her to walk; really painful and tender in certain areas when touched; more of the confusion; received both the Moderna and Pfizer vaccine 18 days apart; Patient received the Moderna vaccine asa first dose on 10JUN2021 at the rehabilitation facility and the Pfizer vaccine on 28JUN2021; legs are really sore; This spontaneous case was reported by a patient family member or friend and describes the occurrence of PERIPHERAL SWELLING (more pronounced swelling in legs), MUSCULAR WEAKNESS (weakness in her lower extremities), ASTHENIA (very weak), GAIT DISTURBANCE (very difficult for her to walk) and TENDERNESS (really painful and tender in certain areas when touched) in an 84-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Pneumonia and Shortness of breath. Concurrent medical conditions included Hypertension, Asthma, Heart disorder, Dementia and Swelling of legs. Concomitant products included CARVEDILOL, CHLOROTHIAZIDE, TIOTROPIUM BROMIDE MONOHYDRATE (SPIRIVA), ALBUTEROL [SALBUTAMOL], PANTOPRAZOLE, ALLOPURINOL, LOSARTAN and MEMANTINE HYDROCHLORIDE (MEMANTINE HCL) for an unknown indication.    On 10-Jun-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced PERIPHERAL SWELLING (more pronounced swelling in legs), MUSCULAR WEAKNESS (weakness in her lower extremities), ASTHENIA (very weak), GAIT DISTURBANCE (very difficult for her to walk), TENDERNESS (really painful and tender in certain areas when touched), CONFUSIONAL STATE (more of the confusion), INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (received both the Moderna and Pfizer vaccine 18 days apart), INTERCHANGE OF VACCINE PRODUCTS (Patient received the Moderna vaccine asa first dose on 10JUN2021 at the rehabilitation facility and the Pfizer vaccine on 28JUN2021) and PAIN IN EXTREMITY (legs are really sore). At the time of the report, PERIPHERAL SWELLING (more pronounced swelling in legs), MUSCULAR WEAKNESS (weakness in her lower extremities), ASTHENIA (very weak), GAIT DISTURBANCE (very difficult for her to walk), TENDERNESS (really painful and tender in certain areas when touched), CONFUSIONAL STATE (more of the confusion), INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (received both the Moderna and Pfizer vaccine 18 days apart), INTERCHANGE OF VACCINE PRODUCTS (Patient received the Moderna vaccine asa first dose on 10JUN2021 at the rehabilitation facility and the Pfizer vaccine on 28JUN2021) and PAIN IN EXTREMITY (legs are really sore) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Prior to vaccination, the patient had pneumonia and shortness of breath. She went in to the hospital on 03JUN2021, was admitted on 04JUN2021, and discharged on 17JUN2021. She was given antibiotics during this time. Patient did not receive any medications for the side effects after vaccination.