Tenderness in his left arm; aches in his left arm; headache; muscle weakness; brain fog; muscle loss was all over the patients body / patient has atrophy all over his body/ burning pain in all of his muscles in his body; insomnia; chills; Patient reports Adverse Reactions of a fever; tachycardia/ heart palpitation/ increased Heart Rate; This spontaneous case was reported by a patient and describes the occurrence of PYREXIA (Patient reports Adverse Reactions of a fever), VACCINATION SITE PAIN (Tenderness in his left arm), VACCINATION SITE PAIN (aches in his left arm), INSOMNIA (insomnia) and CHILLS (chills) in a 27-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 043B21A and 027B21A) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     Patient did not receive any other vaccines in the 4 weeks prior to COVID-19 vaccine.  Concurrent medical conditions included Nerve pain and Atrophy. Concomitant products included GABAPENTIN for Nerve pain and Atrophy.   On 01-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 30-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In April 2021, the patient experienced INSOMNIA (insomnia) and CHILLS (chills). In 2021, the patient experienced PYREXIA (Patient reports Adverse Reactions of a fever). On an unknown date, the patient experienced VACCINATION SITE PAIN (Tenderness in his left arm), VACCINATION SITE PAIN (aches in his left arm), TACHYCARDIA (tachycardia/ heart palpitation/ increased Heart Rate), HEADACHE (headache), MUSCULAR WEAKNESS (muscle weakness), FEELING ABNORMAL (brain fog) and MUSCLE ATROPHY (muscle loss was all over the patients body / patient has atrophy all over his body/ burning pain in all of his muscles in his body). In 2021, PYREXIA (Patient reports Adverse Reactions of a fever) had resolved. At the time of the report, VACCINATION SITE PAIN (Tenderness in his left arm), INSOMNIA (insomnia), CHILLS (chills), HEADACHE (headache), MUSCULAR WEAKNESS (muscle weakness) and FEELING ABNORMAL (brain fog) outcome was unknown, VACCINATION SITE PAIN (aches in his left arm) and MUSCLE ATROPHY (muscle loss was all over the patients body / patient has atrophy all over his body/ burning pain in all of his muscles in his body) had not resolved and TACHYCARDIA (tachycardia/ heart palpitation/ increased Heart Rate) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Cardiac stress test: (Positive) Patient has Echocardiogram, Holter Monitor and a stress test and the Cardiologist diagnosed the Tachycardia. On an unknown date, Echocardiogram: (Positive) Echocardiogram, Holter Monitor and a stress test and the Cardiologist diagnosed the Tachycardia.. On an unknown date, Heart rate: Increased.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No treatment medication details was reported.   It was reported that the patient received first Moderna Covid 19 vaccine and reports adverse reactions of a fever for 1 day. Tenderness and aches in his left arm. Two weeks after this dose the patient started to experience insomnia and chills. The patient received his second Moderna Covid 19 vaccine and reports adverse reactions of fever for 3 days. 3 days later after the fever was over the patient started to experience heart palpitation, tachycardia, and increased Heart Rate. This lasted for 6 months and then at 6 months the side effects progressed to Neurological symptoms including, brain fog, headache, and muscle weakness. The muscle loss was all over the patients body however the muscle loss was most pronounced in the patients left arm and hand. Patient had burning pain in all of his muscles in his body. As of today the patient had atrophy all over his body. This had been diagnosed in all 4 limbs by the Doctor. Patient had not tested positive for Covid-19. Patient had not been diagnosed with Myocarditis or Pericarditis. Patient did see a Cardiologist. Patient had Holter Monitor and the Cardiologist diagnosed the Tachycardia.