A blood clot precise upper thigh down to the calf in one leg/ Several blood clots in his lungs/ Major blood clot that was 11 inches in length that was scattered between both of his lungs; Shortness of breath/some shortness of breath; Severe lung pain; Severe pain in the leg; This is a spontaneous report from a contactable consumer. This consumer (parent) reported for a 40-year-old male patient (reporter's son) that he received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number, Expiry Date, UPC Number, NDC Number: Unknown), via an unspecified route of administration on an unspecified date as DOSE 2, SINGLE for covid-19 immunization. Historical vaccine included first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number, Expiry Date: Unknown), via an unspecified route of administration on an unspecified date as DOSE 1, SINGLE for covid-19 immunization. Medical history included palsy and reporter considered it not an illness, but related to brain. The patient's concomitant medications were not reported. Reporter stated that the patient had the COVID vaccine as per reporter it was about 8 weeks ago, and then about 5 weeks ago, he never felt well after he got the vaccine the second one and he went in emergency room with shortness of breath and severe pain in the leg. He was admitted to the ICU with a blood clot precise probably from the upper thigh down to the calf in one leg, several blood clots in his lungs and one major blood clot that was 11 inches in length that was scattered between both of his lungs. The doctors were absolutely shocked that he was alive and they said that they never had seen anybody coming with that size of blood clot. He was in ICU for 4 or 5 days and they put him on blood thinners which reporter thought was like why they were not sending him to a heart hospital they were smaller hospital which reporter thought that they made a major mistake and his pulmonologist would said the same thing that they should have taken it out. But at that point, he was on complete rest he was on blood thinners and if that thing enlarges, he would be dead and they said that he went back to the emergency room on Wednesday with severe pain and they said that a part of it started to dissipate and dislodge in his lungs which was going to cause him severe lung pain and some shortness of breath so we had him monitor his oxygen level and his blood pressure if they went down then they said to come back and that's how we are at. And reporter didn't believe that they reported it and was really angry that they haven't reported it because he also had the palsy and he was not sedentary, but he just started using a wheel chair and we were trying to see that rectify. He was 40 years old but he had never been sick ever and he had never had problems with any kind of blood clot, his heart was healthy, his blood pressure was normal, and 'they were like all those' because people in wheel chairs would have blood clots sometimes and reporter believed that there was no way. The outcome of events were unknown.  The patient experienced a blood clot precise upper thigh down to the calf in one leg/ several blood clots in his lungs/ major blood clot that was 11 inches in length that was scattered between both of his lungs (thrombosis) (hospitalization, medically significant, life threatening) on an unspecified date with outcome of unknown , shortness of breath (dyspnoea) (hospitalization) on an unspecified date with outcome of unknown , severe lung pain (pulmonary pain) (hospitalization) on an unspecified date with outcome of unknown , severe pain in the leg (pain in extremity) (hospitalization) on an unspecified date with outcome of unknown. The patient underwent lab tests and procedures which included blood pressure measurement: unknown on, oxygen consumption: unknown on.  The action taken in response to the event(s) for bnt162b2 was not applicable. Therapeutic measures were taken as a result of a blood clot precise upper thigh down to the calf in one leg/ several blood clots in his lungs/ major blood clot that was 11 inches in length that was scattered between both of his lungs (thrombosis).  Information about lot/batch number has been requested.