Dizziness; Injection site pain; Got rash on left arm; Skin near the injection site is raised; Diarrhea; Couldn't catch balance; Had spinning sensation; Could not sleep well; Arm was hot; Sinus Problems; Arm was sore - sore; Kind of tight at injection site; Extremely Fatigued; Stabbing pain in left strap/shoulder, back side of it; General feeling of not being well; This spontaneous case was reported by a consumer and describes the occurrence of FEELING HOT (Arm was hot), SINUS DISORDER (Sinus Problems), BALANCE DISORDER (Couldn't catch balance), VERTIGO (Had spinning sensation) and INSOMNIA (Could not sleep well) in a 26-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. Unknown) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On an unknown date, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On an unknown date, received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 18-Jan-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced MALAISE (General feeling of not being well). On 17-Jun-2021, the patient experienced ARTHRALGIA (Stabbing pain in left strap/shoulder, back side of it). On 18-Jun-2021, the patient experienced FEELING HOT (Arm was hot) and SINUS DISORDER (Sinus Problems). 18-Jun-2021, the patient experienced INSOMNIA (Could not sleep well), MYALGIA (Arm was sore - sore), VACCINATION SITE INDURATION (Kind of tight at injection site) and FATIGUE (Extremely Fatigued). On 19-Jun-2021, the patient experienced BALANCE DISORDER (Couldn't catch balance) and VERTIGO (Had spinning sensation). 19-Jun-2021, the patient experienced DIARRHOEA (Diarrhea). On 20-Jun-2021, the patient experienced RASH (Got rash on left arm) and VACCINATION SITE SWELLING (Skin near the injection site is raised). On an unknown date, the patient experienced DIZZINESS (Dizziness) and VACCINATION SITE PAIN (Injection site pain). The patient was treated with ACETAMINOPHEN on 18-Jun-2021 at a dose of 1000 milligram; IBUPROFEN (IBUPRO [IBUPROFEN]) on 18-Jun-2021 at a dose of 600 milligram; PHENYLEPHRINE HCL from 18-Jun-2021 to 19-Jun-2021 at a dose of 10 milligram and LORATADINE, PSEUDOEPHEDRINE HYDROCHLORIDE (BENADRYL 24 D) on 20-Jun-2021 for Rash, at a dose of UNK dosage form. On 17-Jun-2021, ARTHRALGIA (Stabbing pain in left strap/shoulder, back side of it) had resolved. On 19-Jun-2021, FEELING HOT (Arm was hot), BALANCE DISORDER (Couldn't catch balance), VERTIGO (Had spinning sensation), INSOMNIA (Could not sleep well), DIZZINESS (Dizziness), MYALGIA (Arm was sore - sore), MALAISE (General feeling of not being well), VACCINATION SITE INDURATION (Kind of tight at injection site), FATIGUE (Extremely Fatigued) and VACCINATION SITE PAIN (Injection site pain) had resolved. At the time of the report, SINUS DISORDER (Sinus Problems) was resolving and DIARRHOEA (Diarrhea), RASH (Got rash on left arm) and VACCINATION SITE SWELLING (Skin near the injection site is raised) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Treatment medications provided by the reporter were nasal decongestant. Action taken with mRNA-1273 in response to the events were not Applicable.   This case was linked to MOD-2021-163904 (Patient Link).