diagnosed with  pulmonary embolisms/both lungs collapsed; Blood Clots; Felt smashed; Felt hot and cold; Mind confusion; Sick all over; Nausea; Body discomfort; Felt like fever; Chills; Extreme shaking; Completely weak/ bones felt shattered; Could't think straight; pneumonia; This case was received via an unknown source (no reference has been entered for a health authority or license partner) on 19-Aug-2021 and was forwarded to Moderna on 19-Aug-2021.    This spontaneous case was reported by a consumer and describes the occurrence of PULMONARY EMBOLISM (diagnosed with  pulmonary embolisms/both lungs collapsed), THROMBOSIS (Blood Clots), PNEUMONIA (pneumonia), CONFUSIONAL STATE (Mind confusion), ILLNESS (Sick all over), DISCOMFORT (Body discomfort), PYREXIA (Felt like fever), CHILLS (Chills), TREMOR (Extreme shaking), ASTHENIA (Completely weak/ bones felt shattered), THINKING ABNORMAL (Could't think straight), FEELING ABNORMAL (Felt smashed) and FEELING OF BODY TEMPERATURE CHANGE (Felt hot and cold) in a 56-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 051C21A) for COVID-19 vaccination.     No Medical History information was reported.    On 22-Jul-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 22-Jul-2021, the patient experienced ILLNESS (Sick all over) (seriousness criteria hospitalization and disability), DISCOMFORT (Body discomfort) (seriousness criteria hospitalization and disability), PYREXIA (Felt like fever) (seriousness criteria hospitalization and disability), CHILLS (Chills) (seriousness criteria hospitalization and disability), TREMOR (Extreme shaking) (seriousness criteria hospitalization and disability), ASTHENIA (Completely weak/ bones felt shattered) (seriousness criteria hospitalization and disability) and THINKING ABNORMAL (Could't think straight) (seriousness criteria hospitalization and disability). On 23-Jul-2021, the patient experienced CONFUSIONAL STATE (Mind confusion) (seriousness criteria hospitalization and disability), FEELING ABNORMAL (Felt smashed) (seriousness criteria hospitalization and disability) and FEELING OF BODY TEMPERATURE CHANGE (Felt hot and cold) (seriousness criteria hospitalization and disability). On an unknown date, the patient experienced PULMONARY EMBOLISM (diagnosed with  pulmonary embolisms/both lungs collapsed) (seriousness criteria hospitalization, disability and medically significant), THROMBOSIS (Blood Clots) (seriousness criteria hospitalization, disability and medically significant) and PNEUMONIA (pneumonia) (seriousness criteria hospitalization, disability and medically significant). At the time of the report, PULMONARY EMBOLISM (diagnosed with  pulmonary embolisms/both lungs collapsed), THROMBOSIS (Blood Clots), PNEUMONIA (pneumonia), CONFUSIONAL STATE (Mind confusion), ILLNESS (Sick all over), DISCOMFORT (Body discomfort), PYREXIA (Felt like fever), CHILLS (Chills), TREMOR (Extreme shaking), ASTHENIA (Completely weak/ bones felt shattered), THINKING ABNORMAL (Could't think straight), FEELING ABNORMAL (Felt smashed) and FEELING OF BODY TEMPERATURE CHANGE (Felt hot and cold) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       Patient stated that she continued to experience these side effects as well as feeling smashed, felt heat, felt cold, felt weird, mind confusion and no strength. patient was eventually transported and admitted to the Hospital. The patient remained admitted for 5 days and was diagnosed with pulmonary embolisms, both lungs collapsed, blood clots in lungs and pneumonia. Patient  stated that received treatment and was eventually discharged. No concomitant medications was provided.; Sender's Comments: Based on the 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.