Fallen unconscious and collapsed; Fell down and she was not conscious/passed out; Had concussion like falling on the ground but it appears like a seizure, that was a immediate thing; Fallen unconscious and collapsed; Fell down and she was not conscious; Had concussion like falling on the ground but it appears like a seizure, that was a immediate thing; Low blood pressure; Fever; Shaking/She was shaking/still moving; She was not feeling well; She is still twitching; Eyes go back; This is a spontaneous report from a Pfizer-sponsored program. A contactable consumer (mother) reported that a 14-years-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), dose 2 via an unspecified route of administration, administered in Arm Left on 03Jun2021 (Batch/Lot number was reported as EW 'O or 0' 186) at the age of 14-years-old as SINGLE DOSE for covid-19 immunisation. The patient medical history was none. There were no concomitant medications. No family medical history of seizure. The patient previously received the first dose of BNT162B2 on an unknown date at Arm Left for covid-19 immunisation. The reason for the transfer today (03Jun2021) was that her 14 year old daughter immediately after getting her second dose of the COVID vaccine started shaking, experiencing fever and fallen unconscious and collapsed and was taken to the hospital and she wanted to go ahead and report those adverse side effects for her. She (patient) was 14 year old and she got her second vaccination today and few minutes after she got it, she stood up and she said she was not feeling well and then the next thing reporter knew like her eyes go back, she do not seem conscious and she was shaking as if, looks like she was having a seizure and then she fell down and she was not conscious, so she fell down, she is still twitching. She has no history of like seizures but that is like twisting and now she was taken to the hospital. So, the hospital treated her as if she had a concussion. Reporter have reported to them that she looks like it was a seizure before she fell down, into her head. Reporter further stated "That day was her second shot and like I said she stood up, she got up from that, she said that she got funny and that I can see where she just kind of lost consciousness, eyes going back, shaking as if she was having seizures and then she fell down and she was unconscious and she is like still moving as if she is having a seizure and she was taken. Reporter stated, "it was a like a seizure but it is like over and she had concussion like falling on the ground but it appears like a seizure, that was a immediate thing." For treatment, reporter stated that "Any treatment, No. She was taken to the hospital and the hospital needs to write it down and I don't understand that, the hospital wrote down concussion but the hospital they took the vital signs and she had low blood pressure." For the date when patient went to the hospital, reporter stated "That was today, June 3rd and she is discharged. The reason she was taken was potential seizure and it was concussion and it was after she fell, she passed out and had low blood pressure. The outcome of the events was unknown. Information on the lot/batch number has been requested.