lump/inflammation on the inner part of both elbows comes and goes after first booster dose; lump/inflammation on the inner part of both elbows comes and goes after first booster dose; Did not feel well after first booster dose; Arms don't want to work in the morning after first booster dose/When up and around arms feel better after first booster dose/Arms are worst worst when she wakes up after first booster dose; Both Arms hurt when reaching for something after first booster dose; Itching left arm vaccination site after first booster dose; Can feel the vaccination site on left arm after first booster dose/Aware that she had a shot there (No Pain) after first booster dose; This spontaneous case was reported by a patient and describes the occurrence of LIMB MASS (lump/inflammation on the inner part of both elbows comes and goes after first booster dose), INFLAMMATION (lump/inflammation on the inner part of both elbows comes and goes after first booster dose), MALAISE (Did not feel well after first booster dose), MUSCULOSKELETAL STIFFNESS (Arms don't want to work in the morning after first booster dose/When up and around arms feel better after first booster dose/Arms are worst worst when she wakes up after first booster dose) and PAIN IN EXTREMITY (Both Arms hurt when reaching for something after first booster dose) in a 77-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 939903, 003A21A and 010M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 31-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 28-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 09-Nov-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 09-Nov-2021, the patient experienced VACCINATION SITE PRURITUS (Itching left arm vaccination site after first booster dose) and VACCINATION SITE DISCOMFORT (Can feel the vaccination site on left arm after first booster dose/Aware that she had a shot there (No Pain) after first booster dose). On 28-Dec-2021, the patient experienced PAIN IN EXTREMITY (Both Arms hurt when reaching for something after first booster dose). In January 2022, the patient experienced MUSCULOSKELETAL STIFFNESS (Arms don't want to work in the morning after first booster dose/When up and around arms feel better after first booster dose/Arms are worst worst when she wakes up after first booster dose). On an unknown date, the patient experienced LIMB MASS (lump/inflammation on the inner part of both elbows comes and goes after first booster dose), INFLAMMATION (lump/inflammation on the inner part of both elbows comes and goes after first booster dose) and MALAISE (Did not feel well after first booster dose). The patient was treated with IBUPROFEN for Adverse event, at a dose of 1800 milligram once a day. At the time of the report, LIMB MASS (lump/inflammation on the inner part of both elbows comes and goes after first booster dose), INFLAMMATION (lump/inflammation on the inner part of both elbows comes and goes after first booster dose) and PAIN IN EXTREMITY (Both Arms hurt when reaching for something after first booster dose) had not resolved and MALAISE (Did not feel well after first booster dose), MUSCULOSKELETAL STIFFNESS (Arms don't want to work in the morning after first booster dose/When up and around arms feel better after first booster dose/Arms are worst worst when she wakes up after first booster dose), VACCINATION SITE PRURITUS (Itching left arm vaccination site after first booster dose) and VACCINATION SITE DISCOMFORT (Can feel the vaccination site on left arm after first booster dose/Aware that she had a shot there (No Pain) after first booster dose) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Rheumatoid factor: negative (Negative) Negative.         No Concomitant product use was reported.  The patient received the first Booster dose and after the first booster shot, the patient could feel the vaccination site on the left arm, itching left arm vaccination site, and the patient was aware that the patient had a shot there (No Pain). The feeling was going away and coming back. The patient did not felt well.  Around the end of Dec-2021, the patient's both arms were hurt when the patient was tried to reach for something. In Jan-2022, their arms don't wanted to work in the morning when the patient woke up. When the patient was up and around arms feel better. On 24-May-2022, The patient still had pain on movement. The patient also had a lump /inflammation on the inner part of both elbows which comes and goes. The doctor did Rheumatory Arthritis test and it was negative.  The doctor suggested OTC Ibuprofen, but the patient couldn't take it because at 1800mg a day it makes the patient dizzy.   This case was linked to MOD-2022-573727, MOD-2022-573732 (Patient Link).