Mouth ulcers; cold sores, like the vaccine activated the herpes simplex, this activated a massive reaction/Right now on his lip he has one extremely deep and large sore, very very painful; canker sores in his tonsils and down his throat Another one formed underneath his tongue; can't stop sleeping/ can barely sleep; can barely eat/ He is on a pure liquid diet for 3 months now; he is miserable; lost weight; He is in so much agonizing pain constantly; After the second shot he was down for about a month; could not get out of bed; mouth started breaking out in sores and they are not going away; This spontaneous case was reported by a consumer and describes the occurrence of VACCINATION COMPLICATION (After the second shot he was down for about a month), BEDRIDDEN (could not get out of bed), ORAL PAIN (mouth started breaking out in sores and they are not going away), MOUTH ULCERATION (Mouth ulcers) and ORAL HERPES (cold sores, like the vaccine activated the herpes simplex, this activated a massive reaction/Right now on his lip he has one extremely deep and large sore, very very painful) in a 47-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 037C21A and 004C21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Cold sores (Prior to the shot he would have maybe one cold sore outbreak a year or 2 a year.). Concurrent medical conditions included Disability.   On 30-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 30-May-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 01-Jun-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced ORAL PAIN (mouth started breaking out in sores and they are not going away). On an unknown date, the patient experienced VACCINATION COMPLICATION (After the second shot he was down for about a month), BEDRIDDEN (could not get out of bed), MOUTH ULCERATION (Mouth ulcers), ORAL HERPES (cold sores, like the vaccine activated the herpes simplex, this activated a massive reaction/Right now on his lip he has one extremely deep and large sore, very very painful), APHTHOUS ULCER (canker sores in his tonsils and down his throat Another one formed underneath his tongue), INSOMNIA (can't stop sleeping/ can barely sleep), FEEDING DISORDER (can barely eat/ He is on a pure liquid diet for 3 months now), FEELING ABNORMAL (he is miserable), WEIGHT DECREASED (lost weight) and PAIN (He is in so much agonizing pain constantly). At the time of the report, VACCINATION COMPLICATION (After the second shot he was down for about a month), BEDRIDDEN (could not get out of bed), APHTHOUS ULCER (canker sores in his tonsils and down his throat Another one formed underneath his tongue) and INSOMNIA (can't stop sleeping/ can barely sleep) had resolved, ORAL PAIN (mouth started breaking out in sores and they are not going away) and ORAL HERPES (cold sores, like the vaccine activated the herpes simplex, this activated a massive reaction/Right now on his lip he has one extremely deep and large sore, very very painful) had not resolved and MOUTH ULCERATION (Mouth ulcers), FEEDING DISORDER (can barely eat/ He is on a pure liquid diet for 3 months now), FEELING ABNORMAL (he is miserable), WEIGHT DECREASED (lost weight) and PAIN (He is in so much agonizing pain constantly) outcome was unknown.            No concomitant medications were reported. No treatment medications were reported. The patient is on a pure liquid diet for 3 months now.   This case was linked to MOD-2021-336006 (Patient Link).