This spontaneous case was reported by a consumer and describes the occurrence of NEURALGIC AMYOTROPHY (severe pain in muscles of right chest wall, axilla, arm and hand.weakness numbness of 5 th finger, and loss of coordinationin right hand. occured after 3rd dose, indication immune compromise from Arava for RA.), CERVICAL RADICULOPATHY (CERVICAL RADICULOPATHY), PAIN IN EXTREMITY (RIGHT ARM PAIN) and MUSCULAR WEAKNESS (WEAKNESS OF RIGHT HAND) in a 66-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 024C21A) for COVID-19 vaccination. Concurrent medical conditions included Immunocompromised (Compromise of immune system secondary to taking arava.), Hypertension, Rheumatoid arthritis (Rheumatoid like arthritis.), Degenerative disc disease (spine), Osteoarthritis, Major depression, GERD, Migraine, Cervical spondylosis, Hyperlipidemia, Obstructive sleep apnea syndrome, Post-traumatic stress disorder, Peripheral neuropathy, Insomnia, Benign essential tremor, Renal calculus, Actinic keratosis, Atherosclerosis of aorta, Basal cell carcinoma, Cervical disc degeneration, Obesity (Obesity, BMI - 30-34.9, ADULT.), Chronic pain, Basal cell carcinoma of skin in situ, Inflammatory polyarthritis, Hyperglycemia and Contrast media allergy. Concomitant products included PREGABALIN for Arthritis, SIMVASTATIN (ZOCOR) for Dyslipidemia, METFORMIN for Hyperglycemia, ATENOLOL (TENOLOL), AMLODIPINE and LISINOPRIL for Hypertension, LAMOTRIGINE (LAMICTAL) for Mood change, DULOXETINE for Pain, PANTOPRAZOLE SODIUM SESQUIHYDRATE (PROTONIX [PANTOPRAZOLE SODIUM SESQUIHYDRATE]), LEFLUNOMIDE, PREGABALIN (LYRICA), TERAZOSIN HYDROCHLORIDE (HYTRIN), MODAFINIL (PROVIGIL [MODAFINIL]), HYDROCHLOROTHIAZIDE (ESIDRIX), ESCITALOPRAM OXALATE (LEXAPRO), MELATONIN and SUMATRIPTAN (IMITREX [SUMATRIPTAN]) for an unknown indication. On 10-Sep-2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On an unknown date, the patient received dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) at an unspecified dose. On 14-Sep-2021, the patient experienced NEURALGIC AMYOTROPHY (severe pain in muscles of right chest wall, axilla, arm and hand.weakness numbness of 5 th finger, and loss of coordinationin right hand. occured after 3rd dose, indication immune compromise from Arava for RA.). In September 2021, the patient experienced CERVICAL RADICULOPATHY (CERVICAL RADICULOPATHY), PAIN IN EXTREMITY (RIGHT ARM PAIN) and MUSCULAR WEAKNESS (WEAKNESS OF RIGHT HAND). The patient was treated with PREDNISONE (oral) on 25-Sep-2021 at a dose of take 3 tablets by mouth daily for 5 days; MELOXICAM (oral) on 25-Sep-2021 for Pain, at a dose of take 1 or 2 tablets as needed; HYDROCODONE BITARTRATE, PARACETAMOL (VICODIN) for Pain, at an unspecified dose and frequency; OXYCODONE HYDROCHLORIDE, OXYCODONE TEREPHTHALATE, PARACETAMOL (PERCOCET [OXYCODONE HYDROCHLORIDE;OXYCODONE TEREPHTHALATE;PARACETAMOL]) (oral) on 25-Sep-2021 for Pain, at a dose of 5-325 MG, take 1 tablet by mouth every 6 hours as needed and KETOROLAC (intravenous) on 25-Sep-2021 for Pain, at a dose of 30 milligram per millilitre. At the time of the report, NEURALGIC AMYOTROPHY (severe pain in muscles of right chest wall, axilla, arm and hand.weakness numbness of 5 th finger, and loss of coordinationin right hand. occured after 3rd dose, indication immune compromise from Arava for RA.) had not resolved and CERVICAL RADICULOPATHY (CERVICAL RADICULOPATHY), PAIN IN EXTREMITY (RIGHT ARM PAIN) and MUSCULAR WEAKNESS (WEAKNESS OF RIGHT HAND) outcome was unknown.  DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 02-Nov-2021, Electromyogram: abnormal (abnormal) subacute right brachial plexopathy(Parsonage-Tuner syndrome). On 25-SEP-2021 patient visited urgent care where treated for neuropathic pain, also neurologist ordered to take MRI of cervical spine and right brachial plexus and EMG/NCV to look for radiculopathy vs brachial plexopathy vs right UE entrapment neuropathy. Also informed to continue Lyrica and perocet5/325 3 times in 24 hours. The patient mentioned that events occurred 3 days after third covid-19 booster dose. The patient is using blood glucose meter(ONE TOUCHVERIO FLEX START) as directed to test blood sugar, lancets 30 gauge misc and check blood sugar 2 times a day. Every morning before breakfast and evening before dinner. Treatment medications includes Oral steroids (prednisone), anti-inflammatory (meloxicam), Vicodin for pain, Percocet. This case was linked to MOD-2021-395875, MOD-2021-395899 (Patient Link).Most recent FOLLOW-UP information incorporated above includes:On 30-Nov-2021: Follow up received contains patient height, weight, race, allergies,  medical history and conditions, concomitant medication, treatment medication and new events pertaining to dose 3 added and outcome of events- added.