broad burning chest pain; broad burning chest pain; weakness; loss of appetite; flushing; extreme thirst; frequent urination / diuretic-like experience; bouts of systemic urticaria showing up on part of the body; nausea; mental confusion; got a very sore arm; felt rather unwell; racing pounding heart; Sore throat; my ears got extremely itchy approximately 6 hours after the booster; headache; Chills; This spontaneous case was reported by a consumer and describes the occurrence of CONFUSIONAL STATE (mental confusion), PAIN IN EXTREMITY (got a very sore arm), MALAISE (felt rather unwell), PALPITATIONS (racing pounding heart) and OROPHARYNGEAL PAIN (Sore throat) 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.     The patient's past medical history included Anaphylactoid reaction (Patient previously had idiopathic anaphylactoid incidents). Previously administered products included for COVID-19 vaccination: AstraZeneca COVID-19 vaccine (Fever and aches) in May 2021 and AstraZeneca COVID-19 vaccine (Fever and aches) in July 2021. Past adverse reactions to the above products included Fever with AstraZeneca COVID-19 vaccine and AstraZeneca COVID-19 vaccine.    On 13-Dec-2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In December 2021, the patient experienced CONFUSIONAL STATE (mental confusion), PAIN IN EXTREMITY (got a very sore arm), MALAISE (felt rather unwell), PALPITATIONS (racing pounding heart), OROPHARYNGEAL PAIN (Sore throat), EAR PRURITUS (my ears got extremely itchy approximately 6 hours after the booster), HEADACHE (headache) and CHILLS (Chills). On 26-Dec-2021, the patient experienced CHEST PAIN (broad burning chest pain), BURNING SENSATION (broad burning chest pain), ASTHENIA (weakness), DECREASED APPETITE (loss of appetite), FLUSHING (flushing), THIRST (extreme thirst), POLLAKIURIA (frequent urination / diuretic-like experience), URTICARIA (bouts of systemic urticaria showing up on part of the body) and NAUSEA (nausea). In December 2021, EAR PRURITUS (my ears got extremely itchy approximately 6 hours after the booster) had resolved. At the time of the report, CONFUSIONAL STATE (mental confusion), PAIN IN EXTREMITY (got a very sore arm), MALAISE (felt rather unwell), PALPITATIONS (racing pounding heart), OROPHARYNGEAL PAIN (Sore throat), CHEST PAIN (broad burning chest pain), BURNING SENSATION (broad burning chest pain), ASTHENIA (weakness), DECREASED APPETITE (loss of appetite), FLUSHING (flushing), THIRST (extreme thirst), POLLAKIURIA (frequent urination / diuretic-like experience), URTICARIA (bouts of systemic urticaria showing up on part of the body), HEADACHE (headache), CHILLS (Chills) and NAUSEA (nausea) outcome was unknown. Not Provided    DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In December 2021, SARS-CoV-2 test: negative (Negative) took several COVID tests, all were negative.         No concomitant medications were reported.  Treatment information was not provided. The initial reactions to the Moderna booster included mental confusion, headache, sore arm and ear pruritus. It was mild in nature. A week after the booster, patient felt unwell for 2 to 3 nights with a racing pounding heart, chills and sore throat. All the reactions on 26 December 2021 were similar to the previous anaphylactoid incidents, but it was milder. Over the past week since 26 December 2021 , patient had bouts of systemic urticaria showing up on part of the body, disappearing and then showing up somewhere else the next day and a couple of milder bouts of same chest pain and pounding heart, flushing and diuretic like experience.