Had a seizure, 2 other reactions like seizures; Could not breathe, has breathing problems; Was really sick; could not get out of bed for 4 days; shoulder pain; muscle pain; Felt a little nauseated; Is really fatigued, tired; This spontaneous case was reported by a consumer and describes the occurrence of SEIZURE (Had a seizure, 2 other reactions like seizures) in a 60-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 006B21A and 002A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Blood pressure high, Diverticulitis, Narcolepsy and Vertigo.   On 16-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 13-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient experienced SEIZURE (Had a seizure, 2 other reactions like seizures) (seriousness criterion medically significant), DYSPNOEA (Could not breathe, has breathing problems), ILLNESS (Was really sick), MOBILITY DECREASED (could not get out of bed for 4 days), ARTHRALGIA (shoulder pain), MYALGIA (muscle pain), NAUSEA (Felt a little nauseated) and FATIGUE (Is really fatigued, tired). At the time of the report, SEIZURE (Had a seizure, 2 other reactions like seizures), DYSPNOEA (Could not breathe, has breathing problems), ILLNESS (Was really sick), MOBILITY DECREASED (could not get out of bed for 4 days), ARTHRALGIA (shoulder pain), MYALGIA (muscle pain), NAUSEA (Felt a little nauseated) and FATIGUE (Is really fatigued, tired) outcome was unknown.            The patient's medical history also included an unknown syndrome (could not understand the name). Concomitant product was not reported.  The patient had experienced shoulder pain, muscle pain, fannnnd had elt a little nauseated. Three and a half weeks after having the second shot , he had a seizure, was really sick, could not breathe (started after he got the seizure), and it was horrible.  At the time of the report, the patient continued to have muscle pain and everything, predominantly in his upper chest, and has breathing problems; he had never smoked or anything.  He also had 2 other seizures like reactions.  He was really fatigued and tired.  He could not get out of bed for 4 days.  He went to doctor but was given no aditional treatment.  At some point after he had the seizure, the patient saw his doctor.  Treatment was not reported.  Very limited information regarding this event (seizure) has been provided at this time. Based on the current available information and temporal association between the use of the product and the start date of all other events, a causal relationship cannot be excluded. Details regarding diagnostics, doctor's notes from the clinic visit/ treatment are required for further assessment.; Sender's Comments: Very limited information regarding this event (seizure) has been provided at this time. Based on the current available information and temporal association between the use of the product and the start date of all other events, a causal relationship cannot be excluded. Details regarding diagnostics, doctor's notes from the clinic visit/ treatment are required for further assessment.