she experienced not being able to walk successfully long distances; problems with leg muscles; just feeling very heavy; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  An 86-year-old female patient received BNT162b2 (BNT162B2), on 02Mar2021 as dose 2, single (Lot number: EN6203) at the age of 85 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Guillain Barre" (ongoing), notes: Guillain Barre had it about 10 years ago; "breast cancer surgery" (unspecified if ongoing); "sciatica" (unspecified if ongoing), notes: Coincidentally in the last 7 months, she came down with sciatica.; "autoimmune disease" (unspecified if ongoing), notes: She had autoimmune disease also. There were no concomitant medications. Vaccination history included: BNT162b2 (DOSE 1, SINGLE; Lot number: EM9809; Anatomical location: right arm), administration date: 07Feb2021, when the patient was 85-year-old, for COVID-19 immunization. The following information was reported: GAIT DISTURBANCE (non-serious), outcome "not recovered", described as "she experienced not being able to walk successfully long distances"; MUSCLE DISORDER (non-serious), outcome "not recovered", described as "problems with leg muscles"; LIMB DISCOMFORT (non-serious), outcome "not recovered", described as "just feeling very heavy". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of gait disturbance, muscle disorder, limb discomfort.  Additional information: Caller reported that she had 1 and 2 doses of pfizer Biontech covid 19 vaccine. After second dose 02Mar2021 shortly after she experienced not being able to walk successfully long distances and problems with leg muscles. Caller also reported that she had recently come down with sciatica, which was different than what she was experiencing. She can't say that it was pain, just feeling very heavy caller reports this happened right after the injection. 87 years old      Caller reported that she can walk a max of 5-7 minutes instead of 30 minutes. Stated it was still that way, able to do 12 minutes now. 3,000 steps. Caller stated that was fine for 10 years and then 9 years. Caller also reported that her son had a very serious reaction myasthenia gravis on second shot, admitted in medical crisis still suffering and this was also last year. She stated back in Feb2021 was when she had the 1st Pfizer vaccine and then got the 2nd one in Mar2021 and asks if anyone else reported that kind of problem. She had autoimmune disease also and it is Guillain Barre about 10 years ago and took a year for her to be able to walk successfully from that and from then on she was fine and never had any type of problem with her legs or muscles or anything until after the Pfizer Covid vaccine; she did not connect this until she could no longer walk a distance on a short trail. She can do a short walk but not like she could before and wondering if anyone reported getting symptoms of Guillain Barre. Her son had his 2nd vaccine and ended up in a medical crisis in the hospital for a month. She does a safety report for herself but not for her son and her son had myasthenia gravis and got his 2nd shot on her birthday date and that day he ended up in the hospital for the total of a month in a medical crisis. She is not sure if her son's vaccine was Moderna or Pfizer but he was at death's door. Caller stated she herself was suffering so much with her legs and it dawned on her last night if this related to the vaccine as she got the mild symptoms of Guillain Barre in her legs. She moved there and the doctor was not involved and was her new primary care; declined email. Her 1st dose of the Pfizer Covid19 vaccination was on 07Feb2021 with lot EM9809; 2nd dose administered on 02Mar2021 with lot EN6203 and she had no other doses and never got the boosters because it is recommended if you've ever had Guillain Barre to do not get the boosters; her card had no NDC or expiry dates written on it. One dose was administered to her right arm and the other dose in her left arm. Does not have the dates the reported events began but it would be shortly after her 2nd dose of the Pfizer Covid vaccine and the issue with her legs and not being able to walk distances was ongoing and it is the same; she was able to walk but can't walk a great distance and can walk 3000 steps and go to gym and walk around the track and before she was able to walk a couple miles like 3 miles no problem and her legs just feel heavy on the bottom of the legs from knees to ankles are feeling heavy and she tired when she tried to walk any further and just can't. She did have breast cancer surgery the end of Jan2021 or maybe it was Dec2020, she does not remember the date and started radiation in Mar2021 which would be after her Pfizer Covid shots. Her breast cancer was diagnosed on mammogram and it was the right breast and surgery was within a month and radiation was definitely in Mar2021. Coincidentally in the last 7 months, she came down with sciatica and had every kind of treatment available and is finally doing extremely well and that type of pain she had was totally different and she would not consider what is in her legs painful and she was not complaining of pain but this is just a heaviness. The pain was up in her back and hip and then down her leg to the top of her foot and that has resolved pretty well but she was still having some pain and dealing with that; clarified every medication she took was Tylenol Arthritis Pain 8 Hour once per day and verified the manufacturer for that is Johnson and Johnson with lot BBA024. She stated that she was allergic to most medications and side effects; no further details provided. There were no additional vaccines administered on Same date of the Pfizer Suspect. Adverse events doesn't required a visit to emergency room and not required Physician Office. Patient stated that she does not take any other vaccines and cannot have the flu shot because of Guillain Barrre and can't have the shingles vaccine and can take any vaccines. The Guillain Barre was a side effect of everything. There was no family medical history relevant to adverse events. Patient stated Johnson and Johnson reports 100 cases already for Guillain Barre following their covid vaccine and had no lots, expiry dates or NDC number or patient information to provide and clarified she read about that online. Her son had his 2nd vaccine and ended up in a medical crisis in the hospital for a month. Caller declined to complete report for her son and states she is not sure if he had the Pfizer or Moderna covid vaccine and has no lot, expiry date or NDC to provide for his vaccine but she was with him when he went into acute medical crisis and he was a very very sick man with myasthenia gravis; clarified her son had myasthenia gravis prior to the covid vaccine and it was under control but it was after the covid vaccine when he went into medical crisis. Her son had myasthenia gravis for about 6 years.   Follow-up attempts are completed. No further information is expected.