Faint; Shaking; Jawclenching; Neck spasms; Don't have interest in eating or drinking; TMJ; Groggy; I can't balance; Face is pouring sweating; Maybe I'm dehydrated; Pain in cheek; Dislocated my finger; Head is still full of fog; Vertigo; Get really tired; Chills; Bad joint pain; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of SYNCOPE (Faint) in a female patient of an unknown age 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 No adverse event (No medical history provided.).    On an unknown date, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On an unknown date, the patient experienced SYNCOPE (Faint) (seriousness criterion medically significant), TREMOR (Shaking), BRUXISM (Jawclenching), MUSCLE SPASMS (Neck spasms), DECREASED APPETITE (Don't have interest in eating or drinking), TEMPOROMANDIBULAR JOINT SYNDROME (TMJ), SOMNOLENCE (Groggy), BALANCE DISORDER (I can't balance), HYPERHIDROSIS (Face is pouring sweating), DEHYDRATION (Maybe I'm dehydrated), FACIAL PAIN (Pain in cheek), JOINT DISLOCATION (Dislocated my finger), FEELING ABNORMAL (Head is still full of fog), VERTIGO (Vertigo), FATIGUE (Get really tired), CHILLS (Chills) and ARTHRALGIA (Bad joint pain). At the time of the report, SYNCOPE (Faint), TREMOR (Shaking), BRUXISM (Jawclenching), MUSCLE SPASMS (Neck spasms), DECREASED APPETITE (Don't have interest in eating or drinking), TEMPOROMANDIBULAR JOINT SYNDROME (TMJ), SOMNOLENCE (Groggy), BALANCE DISORDER (I can't balance), HYPERHIDROSIS (Face is pouring sweating), DEHYDRATION (Maybe I'm dehydrated), FACIAL PAIN (Pain in cheek), JOINT DISLOCATION (Dislocated my finger), FEELING ABNORMAL (Head is still full of fog), VERTIGO (Vertigo), FATIGUE (Get really tired), CHILLS (Chills) and ARTHRALGIA (Bad joint pain) outcome was unknown.      The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       This case concerns a female with serious unexpected syncope, and nonserious unexpected somnolence, bruxism, muscle spasms, temporomandibular joint syndrome, facial pain, joint dislocation, balance disorder, tremor, decreased appetite, feeling abnormal, vertigo, hyperhidrosis, dehydration and expected fatigue, chills, arthralgia. Based on current available information and temporal association between the use of the product and the start date of the event, a causal relationship cannot be excluded.   This case was linked to MOD-2021-056963 (Patient Link).   Reporter did not allow further contact; Sender's Comments: This case concerns a female with serious unexpected syncope, and nonserious unexpected somnolence, bruxism, muscle spasms, temporomandibular joint syndrome, facial pain, joint dislocation, balance disorder, tremor, decreased appetite, feeling abnormal, vertigo, hyperhidrosis, dehydration and expected fatigue, chills, arthralgia. Based on current available information and temporal association between the use of the product and the start date of the event, a causal relationship cannot be excluded.