This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of LIMB DISCOMFORT (developed a heavy and painful arm but went away), HYPOAESTHESIA (numb sensation on her left leg), FACIAL DISCOMFORT (tension on the left side of the face), NERVE COMPRESSION (compressed nerve on neck) and PRODUCT DOSE OMISSION ISSUE (did not receive the second dose) in a 42-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 029L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below. No Medical History information was reported. On 15-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 15-Jan-2021, the patient experienced LIMB DISCOMFORT (developed a heavy and painful arm but went away), HYPOAESTHESIA (numb sensation on her left leg), FACIAL DISCOMFORT (tension on the left side of the face) and PAIN IN EXTREMITY (achy pain on her arm). On an unknown date, the patient experienced NERVE COMPRESSION (compressed nerve on neck) and PRODUCT DOSE OMISSION ISSUE (did not receive the second dose). The patient was treated with PREDNISONE at a dose of UNK dosage form and IBUPROFEN (MOTRIN [IBUPROFEN]) at a dose of UNK dosage form. At the time of the report, LIMB DISCOMFORT (developed a heavy and painful arm but went away), PRODUCT DOSE OMISSION ISSUE (did not receive the second dose) and PAIN IN EXTREMITY (achy pain on her arm) had resolved and HYPOAESTHESIA (numb sensation on her left leg), FACIAL DISCOMFORT (tension on the left side of the face) and NERVE COMPRESSION (compressed nerve on neck) had not resolved. DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In 2021, Magnetic resonance imaging head: normal result (normal) Normal. In 2021, Magnetic resonance imaging neck: compressed nerve (abnormal) compressed nerve. The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown. No relevant concomitant medications were provided. The patient initially reported that she had burning sensation and sometimes her arm felt numb, like pins" pricking on left arm 4 days after taking the vaccine. She felt the exact same thing right after she was injected with the vaccine, but it went away immediately. Later, the patient also reported that she developed heavy and painful arm but went away. She was feeling burning sensation and numbness of the left arm that had traveled to her fingers. On 18-May-2021, The patient called in stating that she was still experiencing burning in the left arm (where she received the vaccine) that was on and off, achy pain on her arm, numb sensation on her left leg, and some tension on the left side of the face. These symptoms were always present on and off. She had consulted this with her doctor. She then underwent series of tests to determine the cause of her concern. She was then prescribed with prednisone for 10 days; she finished the recommended days to take the medication, but it did not alleviate her condition. She was advised by her doctor to receive a shot of a steroid on her neck, which she does not want to receive. Now, she was undergoing acupuncture. But she stated that nothing made her feel better. Before, she felt it more frequently. Her doctor advised her to still receive the second dose, but she opted not to receive the second dose of the vaccine. Most recent FOLLOW-UP information incorporated above includes: On 19-Jan-2021: Additional information received included new event information. On 18-May-2021: Additional information received included new events, patient contact details and date of birth, Lot# of vaccine, Lab data, event outcomes, treatment details.