hard to explain sensation in the middle of my chest; chest tighten and pressure mostly concentrated around the middle and left side of my chest but mostly the left side; blood pressure is low; feeling strange; noticed dry liquid on my shoulder as well as some blood; feel occasional sharp jabs in my left shoulder and back shoulder blade; pressure down the leg in artery and in neck artery; pericarditis; This spontaneous case was reported by a consumer and describes the occurrence of PERICARDITIS (pericarditis) in a patient of an unknown age and gender who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    In 2021, the patient received dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced CHEST PAIN (hard to explain sensation in the middle of my chest), CHEST DISCOMFORT (chest tighten and pressure mostly concentrated around the middle and left side of my chest but mostly the left side), HYPOTENSION (blood pressure is low), FEELING ABNORMAL (feeling strange), VACCINATION SITE HAEMORRHAGE (noticed dry liquid on my shoulder as well as some blood), ARTHRALGIA (feel occasional sharp jabs in my left shoulder and back shoulder blade), DISCOMFORT (pressure down the leg in artery and in neck artery) and PERICARDITIS (pericarditis) (seriousness criterion medically significant). The patient was treated with ACETYLSALICYLIC ACID (ASPIRIN 1000) for Adverse reaction, at a dose of 1000 milligram three times a day. At the time of the report, CHEST PAIN (hard to explain sensation in the middle of my chest), CHEST DISCOMFORT (chest tighten and pressure mostly concentrated around the middle and left side of my chest but mostly the left side), HYPOTENSION (blood pressure is low), FEELING ABNORMAL (feeling strange), VACCINATION SITE HAEMORRHAGE (noticed dry liquid on my shoulder as well as some blood), ARTHRALGIA (feel occasional sharp jabs in my left shoulder and back shoulder blade), DISCOMFORT (pressure down the leg in artery and in neck artery) and PERICARDITIS (pericarditis) outcome was unknown. Not Provided    DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood pressure measurement: low (Low) low.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       No concomitant medication details was reported. The patient experienced a feeling of chest tightening and chest pressure a few hour after vaccination. Since than the patient exhibited most symptoms of pericarditis, based on patient's research and conclusion. The patient also felt occasional sharp jabs in left shoulder and shoulder blade. The chest tightness tends to be worse when patient lays down. The patient cannot under any circumstances go to any clinic or hospital as these are epicentres of infection.  Company Comment: This case concerns a patient with no relevant medical history reported, who experienced the expected event of pericarditis. The patient started experiencing tightening and pressure in chest on the same day after dose of Spikevax. The patient stated that symptoms of pericarditis were experienced based on patient's research and conclusion, however, the diagnosis was not confirmed by the HCP as the patient did not go to hospital or clinic. The rechallenge was unknown not applicable. The reporter assessed the event as related to the product. The benefit-risk relationship of Spikevax in not affected by this report.; Sender's Comments: This case concerns a patient with no relevant medical history reported, who experienced the expected event of pericarditis. The patient started experiencing tightening and pressure in chest on the same day after dose of Spikevax. The patient stated that symptoms of pericarditis were experienced based on patient's research and conclusion, however, the diagnosis was not confirmed by the HCP as the patient did not go to hospital or clinic. The rechallenge was unknown not applicable. The reporter assessed the event as related to the product. The benefit-risk relationship of Spikevax in not affected by this report.