Greater acid reflux than before; Heartburn is awful, I cannot eat or swallow; Heartburn is awful, I cannot eat or swallow; I feel incapacitated; I felt a pain across my back, shoulder blade, arms wrist and neck; I felt a pain across my back, shoulder blade, arms wrist and neck; I felt a pain across my back, shoulder blade, arms wrist and neck/arm began to ache; After the second dose, by the next day injection site was hurting; This spontaneous case was reported by a consumer and describes the occurrence of BACK PAIN (I felt a pain across my back, shoulder blade, arms wrist and neck), NECK PAIN (I felt a pain across my back, shoulder blade, arms wrist and neck), PAIN IN EXTREMITY (I felt a pain across my back, shoulder blade, arms wrist and neck/arm began to ache), GASTROOESOPHAGEAL REFLUX DISEASE (Greater acid reflux than before) and DYSPEPSIA (Heartburn is awful, I cannot eat or swallow) in a 79-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 037A21D and 027A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 06-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 06-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 07-Apr-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced VACCINATION SITE PAIN (After the second dose, by the next day injection site was hurting). On 08-Apr-2021, the patient experienced BACK PAIN (I felt a pain across my back, shoulder blade, arms wrist and neck), NECK PAIN (I felt a pain across my back, shoulder blade, arms wrist and neck) and PAIN IN EXTREMITY (I felt a pain across my back, shoulder blade, arms wrist and neck/arm began to ache). On an unknown date, the patient experienced GASTROOESOPHAGEAL REFLUX DISEASE (Greater acid reflux than before), DYSPEPSIA (Heartburn is awful, I cannot eat or swallow), DYSPHAGIA (Heartburn is awful, I cannot eat or swallow) and IMPAIRED WORK ABILITY (I feel incapacitated). The patient was treated with ESOMEPRAZOLE SODIUM (NEXIUM [ESOMEPRAZOLE SODIUM]) for Adverse event, at a dose of UNK dosage form. At the time of the report, BACK PAIN (I felt a pain across my back, shoulder blade, arms wrist and neck), NECK PAIN (I felt a pain across my back, shoulder blade, arms wrist and neck), PAIN IN EXTREMITY (I felt a pain across my back, shoulder blade, arms wrist and neck/arm began to ache), GASTROOESOPHAGEAL REFLUX DISEASE (Greater acid reflux than before), DYSPEPSIA (Heartburn is awful, I cannot eat or swallow), DYSPHAGIA (Heartburn is awful, I cannot eat or swallow), IMPAIRED WORK ABILITY (I feel incapacitated) and VACCINATION SITE PAIN (After the second dose, by the next day injection site was hurting) had not resolved.            No relevant concomitant medications were reported. Patient had a cardiac workup done at hospital.   Most recent FOLLOW-UP information incorporated above includes: On 06-Oct-2021: Followup received on 06-OCT-2021 ,Added reporter's address and updated route of administration for dose 1.