Passed Out; feeling light headed/lightheadedness/being lightheaded; Fell Down Stairs/falling; hit his head and his knee; hit his head and his knee; This is a spontaneous report from a contactable consumer (patient's father). An 18-year-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection), dose 1 via an unspecified route of administration, administered in right arm at the age of 18-year-old on 07Apr2021 09:50 (Batch/Lot number was not reported) as single dose for COVID-19 immunisation. Medical history included ongoing congenital diaphragmatic hernia (that prevented his lungs from developing before he was born). There were no concomitant medications. The patient previously took influenza vaccine (FLU) for immunization and without a reaction. Caller is a consumer, calling about his 18 years son who received the covid vaccine this morning and had an adverse event afterwards. Caller reported that his 18 years son had his first covid vaccine dose this morning. He has had all of his vaccinations, even the flu shot every year without a reaction. After having his covid vaccination, on the way home he said he started feeling light headed. He was supposed to go back to school once they got home but the caller noticed that his son hadn't left yet because he drives himself. He reported that his son's room is downstairs and when he looked his son was laying down at the bottom of the stairs and appears to have passed out. He reports that now he is fine and he has eaten. Calling now because he was concerned and "wanted to make sure there was nothing else I should do in this situation''. Caller stated that he took his two kids to get their vaccines. His son is 18 years old and his daughter will be 18 next Tuesday.Stated that they stayed at the site in case of a reaction to the vaccine and nothing happened. On the way back home the son became lightheaded. Caller thought maybe he needed to eat even though he had eaten a light breakfast before they went to get the vaccines. Stated his son got home and passed out. Caller had never seen his son pass out before. Said his son fell down the stairs while going to the basement where is room is located. Caller was concerned this could've been a reaction and is calling to see if there is anything further they should be concerned about. The son's vaccine, lightheadedness, passing out, and falling all took placed today 07Apr2021. Caller said he nor his son are certain if he was injured during the fall. His son thinks he hit his head and his knee and noticed that his shorts where ripped behind the leg on 07Apr2021.  Caller states his son says he is feeling back to normal and fine. The son was supposed to go to school after the vaccine but the caller had him stay home so he could keep an eye on him. Caller stated it was scary. The caller opened the door and saw his son lying on the floor with the gum he had bought at the drug store strewn out everywhere. Caller stated they are believers in vaccines. Stated his son used to have a part time job at the grocery store bagging groceries for customers and was wanting to go back to work. Caller also said that his son was born with a congenital diaphragmatic hernia that prevented his lungs from developing before he was born. Caller stated that due to this him and his wife felt it was best for the son to get the vaccine since if he got the Covid virus it could have been really bad for him. Caller denies any medications, labs, testing or treatments that are relevant to these events. Caller stated his son is healthy. Stated when his son mentioned being lightheaded in the car, the caller didn't think much of it. The outcome of events was recovered on 07Apr2021.   Information on the lot/batch number has been requested.