quick to anger; tremendous pain on the left arm below it down to the fingers; dizziness; his left arm down to his hands and fingers went numb/getting numb; tremendous pain on the left arm above the injection site (shoulder); weakness on the right side; left arm down to his hands and fingers felt cold; off/out of balance (leaned to the right); could not concentrate; blurred vision; This spontaneous case was reported by a consumer and describes the occurrence of HEMIPARESIS (weakness on the right side) in a 59-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 013F21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Penicillin allergy.    On 02-Dec-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 04-Dec-2021, the patient experienced HEMIPARESIS (weakness on the right side) (seriousness criterion medically significant), PERIPHERAL COLDNESS (left arm down to his hands and fingers felt cold), BALANCE DISORDER (off/out of balance (leaned to the right)), DISTURBANCE IN ATTENTION (could not concentrate), VISION BLURRED (blurred vision), PAIN IN EXTREMITY (tremendous pain on the left arm below it down to the fingers), DIZZINESS (dizziness), HYPOAESTHESIA (his left arm down to his hands and fingers went numb/getting numb) and VACCINATION SITE JOINT PAIN (tremendous pain on the left arm above the injection site (shoulder)). On an unknown date, the patient experienced ANGER (quick to anger). The patient was treated with VITAMIN A NOS at a dose of 1 dosage form; VITAMIN D NOS at a dose of 1 dosage form; ASPIRIN [ACETYLSALICYLIC ACID] at a dose of 1 dosage form and NAPROXEN SODIUM (ALEVE) at a dose of 1 dosage form. In December 2021, PAIN IN EXTREMITY (tremendous pain on the left arm below it down to the fingers) and VACCINATION SITE JOINT PAIN (tremendous pain on the left arm above the injection site (shoulder)) had resolved. At the time of the report, HEMIPARESIS (weakness on the right side), PERIPHERAL COLDNESS (left arm down to his hands and fingers felt cold), BALANCE DISORDER (off/out of balance (leaned to the right)), DISTURBANCE IN ATTENTION (could not concentrate), VISION BLURRED (blurred vision), ANGER (quick to anger), DIZZINESS (dizziness) and HYPOAESTHESIA (his left arm down to his hands and fingers went numb/getting numb) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 04-Dec-2021, Blood pressure measurement: elevated (High) Elevated. On 04-Dec-2021, Ultrasound scan: normal (normal) Found nothing.     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.   Patient's left arm down to his hands and fingers felt cold and went numb. Patient thought he had a stroke. It was reported that from emergency room they said that he did not have carpal tunnel syndrome. Patient also complained of tremendous pain on the left arm above the injection site and below it down to the fingers which lasted for 9 days. While at the emergency room, he was told that his BP was elevated (BP readings not provided to the consumer). During the call, while he was holding the phone on his left hand, and said that it was getting numb. Patient did not have these symptoms prior to getting the vaccine and he has not seen his doctor in the past 2 years. No concomitant medications were reported. Patient has not received the second dose. Company comment: This case concerns a 59-year-old, male patient with no relevant medical history reported, who experienced the unexpected serious event of hemiparesis along with other non serious events. The events occurred approximately 2 days after the first dose of mRNA-1273. As reported, patient's left arm down to his hands and fingers felt cold and went numb. Patient thought he had a stroke and went to the emergency room and ultrasound of his left arm was done but nothing was found. It was reported that from emergency room he was told that he did not have carpal tunnel syndrome. Patient also complained of tremendous pain on the left arm above the injection site (shoulder) and below it down to the fingers which lasted for 9 days. Patient was also off/out of balance (leaned to the right), had weakness on the right side, had dizziness, could not concentrate and had blurred vision, as reported. Patient also observed that he has been quick to anger after getting the vaccine. While at the emergency room, he was told that his blood pressure was elevated. Outcome of events was unknown. The benefit-risk relationship of mRNA-1273 is not affected by this report.; Sender's Comments: This case concerns a 59-year-old, male patient with no relevant medical history reported, who experienced the unexpected serious event of hemiparesis along with other non serious events. The events occurred approximately 2 days after the first dose of mRNA-1273. As reported, patient's left arm down to his hands and fingers felt cold and went numb. Patient thought he had a stroke and went to the emergency room and ultrasound of his left arm was done but nothing was found. It was reported that from emergency room he was told that he did not have carpal tunnel syndrome. Patient also complained of tremendous pain on the left arm above the injection site (shoulder) and below it down to the fingers which lasted for 9 days. Patient was also off/out of balance (leaned to the right), had weakness on the right side, had dizziness, could not concentrate and had blurred vision, as reported. Patient also observed that he has been quick to anger after getting the vaccine. While at the emergency room, he was told that his blood pressure was elevated. Outcome of events was unknown.The benefit-risk relationship of mRNA-1273 is not affected by this report.