twitches; fever; chills; he started to have spasms in his arm, legs, and back.; This spontaneous case was reported by a consumer and describes the occurrence of MUSCLE SPASMS (he started to have spasms in his arm, legs, and back.), MUSCLE TWITCHING (twitches), PYREXIA (fever) and CHILLS (chills) in a 73-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 040B21A) for COVID-19 vaccination.     The patient's past medical history included Stroke in 2016, Stroke (Patient  had a Minor stroke.) in October 2020 and Hemiparesis (right) on 21-Jan-2016. Concurrent medical conditions included Paralyzed (The stroke in 2016 left patient paralyzed on his right side.) since 2016, Diabetes since 1991, Atrial fibrillation since 17-Dec-2015, Hypertension, Sleep apnea, Hypothyroidism, Penicillin allergy, Drug allergy (Clindamycin), Drug allergy (Lisinopril) and Drug allergy (Accupril). Concomitant products included ACETYLSALICYLIC ACID (ASPIRIN 81) for Anticoagulant therapy, ESCITALOPRAM for Anxiety, APIXABAN (ELIQUIS) from 17-Dec-2015 to an unknown date for Atrial fibrillation, ATORVASTATIN for Cholesterol blood increased, METFORMIN for Diabetes, METOPROLOL for Hypertension, CETIRIZINE HYDROCHLORIDE (CETRIZINE) for Seasonal allergy, LEVOTHYROXINE for Thyroid therapy, FUROSEMIDE (LASIX [FUROSEMIDE]) for Weight gain, VITAMIN B12 [VITAMIN B12 NOS], MULTIVITAMIN [ASCORBIC ACID;BIOTIN;CALCIUM PANTOTHENATE;CYANOCOBALAMIN;FOLIC ACID;NICOTINIC ACID;PYRIDOXINE HYDROCHLORIDE;RIBOFLAVIN;THIAMINE HYDROCHLORIDE;TOCOPHERYL ACETATE], ZINC, VITAMIN D3 and CALCIUM for an unknown indication.    On 13-Apr-2021 at 1:00 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 14-Apr-2021 at 7:30 AM, the patient experienced MUSCLE SPASMS (he started to have spasms in his arm, legs, and back.). On 14-Apr-2021 at 2:30 PM, the patient experienced CHILLS (chills). On 14-Apr-2021 at 3:15 PM, the patient experienced PYREXIA (fever). On 14-Apr-2021 at 4:00 PM, the patient experienced MUSCLE TWITCHING (twitches). The patient was treated with PARACETAMOL (TYLENOL) on 14-Apr-2021 for Fever and Pain, at a dose of 500 mg, 2 tablets and PARACETAMOL (TYLENOL) for Fever and Pain, at a dose of 500 mg as required. On 15-Apr-2021, MUSCLE SPASMS (he started to have spasms in his arm, legs, and back.), PYREXIA (fever) and CHILLS (chills) had resolved. At the time of the report, MUSCLE TWITCHING (twitches) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 14-Apr-2021, Body temperature: 100.5 (High) at 3:15 pm, 100.6 (High) at 6:00 pm and 100.9 (High) 8:30 pm. On 15-Apr-2021, Body temperature: 97.2 (normal) at 07:30 am.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       This case was linked to US-MODERNATX, INC.-MOD-2021-131954 (Linked Report). This case was linked to MOD-2021-135318 (Patient Link).   Most recent FOLLOW-UP information incorporated above includes: On 13-May-2021: follow-up received addition of medical history, addition of concomitant medication ,event recovered On 15-May-2021: Updated the action taken, dechallenge and rechallenge in the product tab and added second dose of the vaccine.; Sender's Comments:  US-MODERNATX, INC.-MOD-2021-131954:First dose case