Severe acid reflux w/mild abdomonal pain; Severe acid reflux w/mild abdomonal pain; What I thought was possible re-occurance of hernia, must have been unrelaterd pulled groin muscle; Headache; pain at injection site (LEFT) arm; This spontaneous case was reported by a consumer and describes the occurrence of GASTROOESOPHAGEAL REFLUX DISEASE (Severe acid reflux w/mild abdomonal pain), ABDOMINAL PAIN (Severe acid reflux w/mild abdomonal pain), MUSCLE STRAIN (What I thought was possible re-occurance of hernia, must have been unrelaterd pulled groin muscle), HEADACHE (Headache) and VACCINATION SITE PAIN (pain at injection site (LEFT) arm) in a 71-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 010M24 and 011A21A) for COVID-19 vaccination.     No medical history was provided by the reporter.  The patient's past medical history included Hypertension on 11-Jan-1979, Osteoporosis (However, must have had onset earlier in 2012(Pelvic Fracture)) on 03-Jan-2014 and Psoriasis on 02-Jan-1969. Concurrent medical conditions included Penicillin allergy, Acid reflux (oesophageal) (bleading ulcer(1983);since medicated. Heartburn Worse after 2nd vaccine dose) since 02-Oct-1983 and Prostate cancer (Had surgery in 2004) on 07-Mar-2004. Concomitant products included FAMOTIDINE (FAMODITINE) from 03-Feb-2013 to an unknown date for Acid reflux (oesophageal), HYDROCHLOROTHIAZIDE, QUINAPRIL HYDROCHLORIDE (QUINAPRIL/HYDROCHLOROTHIAZIDE) from 03-Mar-2010 to an unknown date for Blood pressure high, ATORVASTATIN from 03-Feb-2005 to an unknown date for Cholesterol blood excessive, CLINDAMYCIN from 02-Mar-2021 to 05-Mar-2021 for Dental surgery NOS, OMEPRAZOLE from 03-Mar-2001 to an unknown date for Hiatal hernia, VERAPAMIL from 03-Mar-1991 to an unknown date for Hypertension.   On 06-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 06-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 06-Feb-2021, the patient experienced VACCINATION SITE PAIN (pain at injection site (LEFT) arm). On an unknown date, the patient experienced GASTROOESOPHAGEAL REFLUX DISEASE (Severe acid reflux w/mild abdomonal pain), ABDOMINAL PAIN (Severe acid reflux w/mild abdomonal pain), MUSCLE STRAIN (What I thought was possible re-occurance of hernia, must have been unrelaterd pulled groin muscle) and HEADACHE (Headache). On 07-Feb-2021, VACCINATION SITE PAIN (pain at injection site (LEFT) arm) had resolved. At the time of the report, GASTROOESOPHAGEAL REFLUX DISEASE (Severe acid reflux w/mild abdomonal pain), ABDOMINAL PAIN (Severe acid reflux w/mild abdomonal pain) and HEADACHE (Headache) had resolved and MUSCLE STRAIN (What I thought was possible re-occurance of hernia, must have been unrelaterd pulled groin muscle) outcome was unknown.        mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) and mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosing remained unchanged.       Treatment information was not provided.   Most recent FOLLOW-UP information incorporated above includes: On 03-May-2021: Follow up was received on 03 May 2021  updated medical history, concomitant medications, events were also updated.