The next day her arm was swollen and red/Then again, the next dayIt hurt so bad and, her arm was swelling again and getting red again which continued to the next day.; couldn't breathe; couldn't do anything; right arm, muscles were standing straight up like a body builder.; The following day her shoulderblade to bottom of her rib cage was spasming/spasms would come and go/Then again on the following day the arm symptoms were subsiding/Tuesday morning when she got up to go to bathroom she had muscles spasms at the butt; neck was tight; The next day her arm was swollen and red/On this past Saturday, the swelling and redness in her arm was happening again and continued through Sunday/ On Sunday her arm became more swollen and red than previous episodes.; arm redness felt hot and was hot to the touch the entire time. It hurt so bad and she felt warmness going down her butt for 40 minutes; It hurt so bad and she felt warmness going down her legs for 40 minutes; couldn't move/couldn't move her legs for 40 minutes/ could barely bend her knees for 40 minutes; legs felt numb for 40 minutes; Had a headache/following day, the symptoms started to subside; had pains between her shoulder blades on the right side; Today she is swollen and red at the injection site and all around it.; This spontaneous case was reported by a patient and describes the occurrence of PERIPHERAL SWELLING (The next day her arm was swollen and red/Then again, the next dayIt hurt so bad and, her arm was swelling again and getting red again which continued to the next day.), DYSPNOEA (couldn't breathe), DISTURBANCE IN ATTENTION (couldn't do anything), MUSCLE SWELLING (right arm, muscles were standing straight up like a body builder.) and MUSCLE SPASMS (The following day her shoulderblade to bottom of her rib cage was spasming/spasms would come and go/Then again on the following day the arm symptoms were subsiding/Tuesday morning when she got up to go to bathroom she had muscles spasms at the butt) in a 60-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 027C21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 30-Jul-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On an unknown date, the patient experienced PERIPHERAL SWELLING (The next day her arm was swollen and red/Then again, the next dayIt hurt so bad and, her arm was swelling again and getting red again which continued to the next day.), DYSPNOEA (couldn't breathe), DISTURBANCE IN ATTENTION (couldn't do anything), MUSCLE SWELLING (right arm, muscles were standing straight up like a body builder.), MUSCLE SPASMS (The following day her shoulderblade to bottom of her rib cage was spasming/spasms would come and go/Then again on the following day the arm symptoms were subsiding/Tuesday morning when she got up to go to bathroom she had muscles spasms at the butt), MUSCLE TIGHTNESS (neck was tight), ERYTHEMA (The next day her arm was swollen and red/On this past Saturday, the swelling and redness in her arm was happening again and continued through Sunday/ On Sunday her arm became more swollen and red than previous episodes.), VACCINATION SITE WARMTH (arm redness felt hot and was hot to the touch the entire time. It hurt so bad and she felt warmness going down her butt for 40 minutes), FEELING HOT (It hurt so bad and she felt warmness going down her legs for 40 minutes), MOBILITY DECREASED (couldn't move/couldn't move her legs for 40 minutes/ could barely bend her knees for 40 minutes), HYPOAESTHESIA (legs felt numb for 40 minutes), HEADACHE (Had a headache/following day, the symptoms started to subside), ARTHRALGIA (had pains between her shoulder blades on the right side) and VACCINATION SITE SWELLING (Today she is swollen and red at the injection site and all around it.). At the time of the report, PERIPHERAL SWELLING (The next day her arm was swollen and red/Then again, the next dayIt hurt so bad and, her arm was swelling again and getting red again which continued to the next day.), DYSPNOEA (couldn't breathe), DISTURBANCE IN ATTENTION (couldn't do anything), MUSCLE SWELLING (right arm, muscles were standing straight up like a body builder.), MUSCLE SPASMS (The following day her shoulderblade to bottom of her rib cage was spasming/spasms would come and go/Then again on the following day the arm symptoms were subsiding/Tuesday morning when she got up to go to bathroom she had muscles spasms at the butt), MUSCLE TIGHTNESS (neck was tight), ERYTHEMA (The next day her arm was swollen and red/On this past Saturday, the swelling and redness in her arm was happening again and continued through Sunday/ On Sunday her arm became more swollen and red than previous episodes.), VACCINATION SITE WARMTH (arm redness felt hot and was hot to the touch the entire time. It hurt so bad and she felt warmness going down her butt for 40 minutes), FEELING HOT (It hurt so bad and she felt warmness going down her legs for 40 minutes), MOBILITY DECREASED (couldn't move/couldn't move her legs for 40 minutes/ could barely bend her knees for 40 minutes), HYPOAESTHESIA (legs felt numb for 40 minutes), HEADACHE (Had a headache/following day, the symptoms started to subside), ARTHRALGIA (had pains between her shoulder blades on the right side) and VACCINATION SITE SWELLING (Today she is swollen and red at the injection site and all around it.) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       No concomitant medications were provided by the reporter.  No treatment medications were provided by the reporter.