"It feels like there is a strain on my heart... like it is having to work a lot harder than normal."; Dizziness; Gastrointestinal hit me kind of hard; Headache; Fever/Fever of 101°F; Worst nausea; Vomiting; Chills; Chest pain/gripping kind of chest pain/thought I may have been having a heart attack/put through the ringer/raked over the coals/full gambit of side effects/starting to surface again; Woke up in the middle of the night with shortness of breath/difficulty breathing/struggling to breathe/struggling to breathe while going on a walk; Felt fatigued; Received 2 doses of the Moderna covid-19 vaccine on 17JUL2021 and 24SEP2021; This spontaneous case was reported by a consumer and describes the occurrence of CHEST PAIN (Chest pain/gripping kind of chest pain/thought I may have been having a heart attack/put through the ringer/raked over the coals/full gambit of side effects/starting to surface again), DYSPNOEA (Woke up in the middle of the night with shortness of breath/difficulty breathing/struggling to breathe/struggling to breathe while going on a walk), CARDIAC DISCOMFORT ("It feels like there is a strain on my heart... like it is having to work a lot harder than normal."), DIZZINESS (Dizziness) and ABDOMINAL DISCOMFORT (Gastrointestinal hit me kind of hard) in a 43-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 026D21A and 036C21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 17-Jul-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 24-Sep-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 17-Jul-2021, the patient experienced INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (Received 2 doses of the Moderna covid-19 vaccine on 17JUL2021 and 24SEP2021). On 24-Sep-2021 at 11:00 AM, the patient experienced FATIGUE (Felt fatigued). On 25-Sep-2021, the patient experienced CHEST PAIN (Chest pain/gripping kind of chest pain/thought I may have been having a heart attack/put through the ringer/raked over the coals/full gambit of side effects/starting to surface again), DYSPNOEA (Woke up in the middle of the night with shortness of breath/difficulty breathing/struggling to breathe/struggling to breathe while going on a walk), DIZZINESS (Dizziness), ABDOMINAL DISCOMFORT (Gastrointestinal hit me kind of hard), HEADACHE (Headache), PYREXIA (Fever/Fever of 101°F), NAUSEA (Worst nausea), VOMITING (Vomiting) and CHILLS (Chills). On 14-Oct-2021, the patient experienced CARDIAC DISCOMFORT ("It feels like there is a strain on my heart... like it is having to work a lot harder than normal."). On 24-Sep-2021, INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (Received 2 doses of the Moderna covid-19 vaccine on 17JUL2021 and 24SEP2021) had resolved. At the time of the report, CHEST PAIN (Chest pain/gripping kind of chest pain/thought I may have been having a heart attack/put through the ringer/raked over the coals/full gambit of side effects/starting to surface again), DYSPNOEA (Woke up in the middle of the night with shortness of breath/difficulty breathing/struggling to breathe/struggling to breathe while going on a walk), CARDIAC DISCOMFORT ("It feels like there is a strain on my heart.. like it is having to work a lot harder than normal."), DIZZINESS (Dizziness), ABDOMINAL DISCOMFORT (Gastrointestinal hit me kind of hard), HEADACHE (Headache), FATIGUE (Felt fatigued), PYREXIA (Fever/Fever of 101°F), NAUSEA (Worst nausea), VOMITING (Vomiting) and CHILLS (Chills) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 25-Sep-2021, Body temperature: 101 (High) 101°F. On an unknown date, SARS-CoV-2 antibody test: negative (Negative) Negative.         No concomitant medications were provided. No treatment medications were taken by the patient.  The patient stated that the chest pain probably only lasted 3-4 minutes, but if she tried to move it was a very "gripping kind of chest pain." Lying still made it better. The patient thought she may have been having a heart attack, but dismissed that when lying still made the pain better. The patient thinks she may have had covid-19 in November 2019, however she has had negative antibody tests following that sensation.   This case was linked to MOD-2021-354568 (Patient Link).