Began to have more pain and weakness in legs; Began to have more pain and weakness in legs; Balance was hard to stand; prior to receiving vaccine had trouble walking, but nothing like what experienced after receiving the second dose Pfizer Covid 19 Vaccine; This is a spontaneous report from a contactable consumer (patient) reported for himself. A male patient of an unspecified age received second dose of BNT162B2 (COMIRNATY, Solution for injection, Batch/Lot number: unknown, Expiration date: unknown), via an unspecified route of administration, administered at an unspecified anatomical location on 30Sep2021 as dose 2, single for COVID-19 immunization. The patient's medical history included ongoing myelitis transverse and gait disturbance from an unknown date and unknown if ongoing prior to receiving vaccine had trouble walking, but nothing like what experienced after receiving the second dose Pfizer Covid 19 Vaccine. The patient's concomitant medications were not reported. The patient previously received first dose of BNT162B2 (COMIRNATY, Solution for injection, Batch/Lot number: unknown, Expiration date: unknown) via an unspecified route of administration, administered at an unspecified anatomical location on 02Sep2021 as dose 1, single for COVID-19 immunization and experienced prior to receiving vaccine had trouble walking. It was reported that the patient has transverse myelitis, a neurological problem. The caller tried his best to get information on whether the caller should receive the Pfizer Covid 19 Vaccine or not, knowing the caller had transverse myelitis. The caller could not get an affirmative answer. With all the commotion going on and everything, if the caller did not take the Pfizer Covid 19 Vaccine had a chance of dying or the caller could receive the Pfizer Covid 19 Vaccine and roll the dice. The caller did receive the Pfizer Covid 19 Vaccine. The caller received the first dose Pfizer Covid 19 Vaccine on 02Sep2021 and the second dose on 30Sep2021. 10 days after receiving the second dose Pfizer Covid 19 Vaccine on 10Oct2021, the caller began to have more pain and weakness in legs. The caller's balance was hard for caller to stand. The caller ended up getting a four-wheel walker to try to hang on to walk. Prior to receiving the Pfizer Covid 19 Vaccine, the caller had trouble walking but nothing like what the caller experienced after receiving the second dose Pfizer Covid 19 Vaccine. The caller states his trouble walking hasn't levelled out yet and the caller hopes that the trouble walking dose level out. Will the trouble walking ever stop? Will the trouble walking get better? The caller has spoken with their doctor and the doctor said to call Pfizer. The caller just wanted to put out a warning to other folks that have neurological problems. The caller was not able to get any information on the Pfizer Covid 19 Vaccine. The caller is upset that he could not get somebody to say no, maybe the caller should not take the Pfizer Covid 19 Vaccine, nobody told the caller. The caller would like Pfizer to help other people who have neurological problems and advise others with neurological problems to be cautious. The caller would like Pfizer to notify anybody that might have transverse myelitis that there are risks in receiving the Pfizer Covid 19 Vaccine and advise to delay or maybe not even receive the Pfizer Covid 19 Vaccine. The outcome of the events was unknown.   The lot number for the vaccine [BNT162B2], was not provided and will be requested during follow up.