massive blood clot in the right lung; painful knot under the skin on his arm; threw up about 20 times in 6 hours, and kept vomiting all the next day; massive blood clot in the lung ended up in different parts of the lung causing extreme amount or pain\ Left lung is beginning to hurt again and his chest is killing him; next day when he got up and could barely walk; This spontaneous case was reported by a consumer and describes the occurrence of PULMONARY EMBOLISM (massive blood clot in the right lung), PULMONARY PAIN (massive blood clot in the lung ended up in different parts of the lung causing extreme amount or pain\ Left lung is beginning to hurt again and his chest is killing him) and THROMBOSIS (painful knot under the skin on his arm) in a 45-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 027A21A and 007B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Autoimmune disorder NOS in September 2020 and Broken bones.   On 18-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 15-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 19-Mar-2021, the patient experienced GAIT DISTURBANCE (next day when he got up and could barely walk). On 26-Mar-2021, the patient experienced PULMONARY EMBOLISM (massive blood clot in the right lung) (seriousness criteria hospitalization, medically significant and life threatening). On 04-Apr-2021, the patient experienced PULMONARY PAIN (massive blood clot in the lung ended up in different parts of the lung causing extreme amount or pain\ Left lung is beginning to hurt again and his chest is killing him) (seriousness criterion medically significant). On an unknown date, the patient experienced THROMBOSIS (painful knot under the skin on his arm) (seriousness criterion medically significant) and VOMITING (threw up about 20 times in 6 hours, and kept vomiting all the next day). On 19-Mar-2021, GAIT DISTURBANCE (next day when he got up and could barely walk) outcome was unknown. On 28-Mar-2021, PULMONARY EMBOLISM (massive blood clot in the right lung) had not resolved. On 04-Apr-2021, PULMONARY PAIN (massive blood clot in the lung ended up in different parts of the lung causing extreme amount or pain\ Left lung is beginning to hurt again and his chest is killing him) had not resolved. At the time of the report, THROMBOSIS (painful knot under the skin on his arm) and VOMITING (threw up about 20 times in 6 hours, and kept vomiting all the next day) outcome was unknown. Not Provided          Treatment information provided as  blood thinners (IV heparin) and antibiotics were used to treat the events.  Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.   This case was linked to US-MODERNATX, INC.-MOD-2021-081632 (E2B Linked Report).; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded. US-MODERNATX, INC.-MOD-2021-081632:2nd dose