Can't keep their balance; Numbness/the numbness and nerve pain kept moving to different extremities every day; Nerve shock pain/the numbness and nerve pain kept moving to different extremities every day; Electricity feeling going up their arms; Couldn't get up and walk/crippling; Felt fatigued; Each day the aches/pains became more and more severe; Shooting pain about 6 to 7 inches down their arm from where the injection was given; Dizzy/lightheaded; Felt euphoric/buzzed; This spontaneous case was reported by a consumer and describes the occurrence of BALANCE DISORDER (Can't keep their balance), HYPOAESTHESIA (Numbness/the numbness and nerve pain kept moving to different extremities every day), NEURALGIA (Nerve shock pain/the numbness and nerve pain kept moving to different extremities every day), FEELING ABNORMAL (Electricity feeling going up their arms) and EUPHORIC MOOD (Felt euphoric/buzzed) in a 65-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.     Concurrent medical conditions included Behcet's disease. Concomitant products included VITAMINS NOS for Vitamin supplementation, NEBIVOLOL HYDROCHLORIDE (BYSTOLIC), LISINOPRIL, MULTIVITAMIN [VITAMINS NOS], VITAMIN B COMPLEX (B COMPLEX [VITAMIN B COMPLEX]) and VITAMIN D [VITAMIN D NOS] for an unknown indication.   On 10-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 04-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 10-Mar-2021, the patient experienced EUPHORIC MOOD (Felt euphoric/buzzed), DIZZINESS (Dizzy/lightheaded) and VACCINATION SITE PAIN (Shooting pain about 6 to 7 inches down their arm from where the injection was given). On 11-Mar-2021, the patient experienced BALANCE DISORDER (Can't keep their balance), HYPOAESTHESIA (Numbness/the numbness and nerve pain kept moving to different extremities every day), NEURALGIA (Nerve shock pain/the numbness and nerve pain kept moving to different extremities every day), FEELING ABNORMAL (Electricity feeling going up their arms), HYPOKINESIA (Couldn't get up and walk/crippling), FATIGUE (Felt fatigued) and MYALGIA (Each day the aches/pains became more and more severe). The patient was treated with HYDROCODONE for Adverse event, at an unspecified dose and frequency; MELOXICAM for Adverse event, at an unspecified dose and frequency and CYCLOBENZAPRINE HYDROCHLORIDE (FLEXERIL [CYCLOBENZAPRINE HYDROCHLORIDE]) for Adverse event, at an unspecified dose and frequency. On 11-Mar-2021, EUPHORIC MOOD (Felt euphoric/buzzed), DIZZINESS (Dizzy/lightheaded) and VACCINATION SITE PAIN (Shooting pain about 6 to 7 inches down their arm from where the injection was given) had resolved. At the time of the report, BALANCE DISORDER (Can't keep their balance), HYPOAESTHESIA (Numbness/the numbness and nerve pain kept moving to different extremities every day), NEURALGIA (Nerve shock pain/the numbness and nerve pain kept moving to different extremities every day), FEELING ABNORMAL (Electricity feeling going up their arms), HYPOKINESIA (Couldn't get up and walk/crippling), FATIGUE (Felt fatigued) and MYALGIA (Each day the aches/pains became more and more severe) outcome was unknown.            Other concomitant medications included hydrocodone and meloxicam.  It was reported that after performing certain tests the patient was told by the provider that patient's reflexes are overacting.  Other treatment details included patient used ice/hot packs to help with the symptoms.