developed a large amount of antibodies that is now causing his heart to be inflamed; Postural orthostatic tachycardia syndrome/ when he stands or walks,his blood report becomes very elevated.; Shortness of breath was more severe, started to breath hard; COVID-long hauler; Symptoms were worse today; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of HEART INJURY (developed a large amount of antibodies that is now causing his heart to be inflamed) in an 82-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 031M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COVID-19 from 17-Jan-2020 to April 2020, Hemochromatosis, Ferritin (Ferritin was up to 1110, well out of normal range) in 2002 and Heart enlarged (Had a sonogram in the past which showed his heart was enlarged a little bit). Previously administered products included for an unreported indication: TETANUS VACCINE in April 2021. Concurrent medical conditions included Sleep apnea (Uses a sleep apnea machine), Holter monitoring (Wearing a heart monitor with expected removal on 26-APR-2021) since 12-Apr-2021 and Hypertension.    On 16-Feb-2021, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 25-May-2021, the patient experienced CONDITION AGGRAVATED (Symptoms were worse today). On an unknown date, the patient experienced HEART INJURY (developed a large amount of antibodies that is now causing his heart to be inflamed) (seriousness criterion medically significant), POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME (Postural orthostatic tachycardia syndrome/ when he stands or walks,his blood report becomes very elevated.), DYSPNOEA (Shortness of breath was more severe, started to breath hard) and POST-ACUTE COVID-19 SYNDROME (COVID-long hauler). The patient was treated with ACETYLSALICYLIC ACID (BABY ASPIRIN) for Shortness of breath, at an unspecified dose and frequency and IVABRADINE for Shortness of breath, at an unspecified dose and frequency. At the time of the report, HEART INJURY (developed a large amount of antibodies that is now causing his heart to be inflamed), POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME (Postural orthostatic tachycardia syndrome/ when he stands or walks,his blood report becomes very elevated.) and POST-ACUTE COVID-19 SYNDROME (COVID-long hauler) outcome was unknown and DYSPNOEA (Shortness of breath was more severe, started to breath hard) and CONDITION AGGRAVATED (Symptoms were worse today) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Heart rate: increases (High) With movement heart rate increases.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   No concomitant medications were provided.   This case was linked to MOD-2021-089705 (Patient Link).   Most recent FOLLOW-UP information incorporated above includes: On 01-Jun-2021: Additional event added. Other HCP information added and case updated accordingly.; Sender's Comments: Very limited information regarding these events has been provided at this time. The events are probably related to the patient's comorbidities, additional information required.