This sounded like more of a neurological problem according to her doctor; Legs were not working; Lower half of body was numb; She could not stand up or walk straight; Weakness; Pretty bad pain in right wrist; Lymph node swelling; feeling tired; One was worse than the other but it was strange they would not go straight; they would go in different directions.; As far as the pain, it was really bad pain; she was achy; started hurting across lower back with extreme pain; Both knees hurt really bad; Little bit of a headache on left side; This is a spontaneous report from a contactable consumer (patient). A 73-year-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE; Solution for injection; Lot number: ER8737), via an unspecified route of administration on arm left on 12Apr2021 (age at vaccination: 73 years) as DOSE 1, SINGLE for COVID-19 immunization. The reported verbatim indication included she works at the airport in the international terminal which is a little bit unnerving to think about. Her grandchildren were concerned about her and they were constantly concerned. The patient medical history included she does have allergies to pollen,have her cat bite her, blood pressure, it is for a low functioning thyroid, she was tested years back she did not have any hormones (showed up on testing so they put her on this), progesterone (she uses called Biest/Prog for progesterone). Caller states that she also takes a thyroid cream that she uses called Biest/Prog for progesterone. Caller states that the name does not spell progesterone out but she knows that is what it is for. It is compounded, like a combination. Caller adds it is always confusing to her how it is written.  She has to use it twice a day and two clicks twice a day. Each click, she does not know what it means, and she does not understand if it is one or two clicks for the dosing that is listed on the package. The dosing said 0.5/50 mg. She is not sure if the two clicks are the amount or if it is per the two clicks since she does it all at once.  Caller uses this because when she was tested years back she did not have any hormones that showed up on testing so they put her on this. It took some time to adjust and get it right. She had to have bloodwork done every 6 months and she gets bloodwork done now. She thinks she has been on this a long time, at least six years.  Caller states she does not know the manufacturer. She adds that if she would be able to tell, it is compounded by a pharmacy. She does not think it has individual manufacturers. She does not see anything else on the label. Caller confirms that this is in pharmacy packaging. They mix it up and then put it in a roll on thing that she turns and it clicks out the dosage which she rubs on. No additional information and caller does not know NDC, LOT, or expiration because it is in a pharmacy package. Caller adds that she takes vitamins and that type of thing but does not report on these, and states that she has reported all other medications. Caller adds that she does have allergies to pollen and things like that. She was expecting flu like symptoms, which she had nothing. Her temperature never elevated and there was no problem breathing or nothing like that. Caller adds that she has not had the flu or cold in 12 years and she does not catch those things for some reason. History of all previous immunization with the Pfizer vaccine considered as suspect and All vaccines administered on same date with the Pfizer vaccine considered as suspect was reported as none. Any other vaccinations within four weeks prior to the first administration date of the suspect vaccine was reported as no. AEs following prior vaccinations was reported as none. Family Medical History Relevant to adverse events was reported as none. The patient Concomitant medications included Thyroid (ARMOUR THYROID) taken for low functioning thyroid from an unspecified date (Caller has been taking for many years.  Her doctor said to keep taking medications. Caller states it is for a low functioning thyroid but with this medication it is good.), metoprolol succinate taken for blood pressure from an unspecified date (Caller states that the bottle says Metoprolol Succ and she does not know what that means, but it is extended release so she only takes it once a day. She has been taking it for 8 years or so but can not remember). On 12Apr2021, the patient experienced Both knees hurt really bad, started hurting across lower back with extreme pain, Little bit of a headache on left side. On an unspecified date, the patient experienced Lower half of body was numb and This sounded like more of a neurological problem according to her doctor, One was worse than the other but it was strange they would not go straight; they would go in different directions. On 13Apr2021, the patient experienced Legs were not working, feeling tired, Weakness, Pretty bad pain in right wrist, Lymph node swelling. On an unspecified date in Apr2021, the patient experienced As far as the pain, it was really bad pain, she was achy, She could not stand up or walk straight.  It was reported that she got the vaccination, the first one, on 12Apr2021, and she has had quite a few side effects from it.  There is one that the doctor is concerned about and wants her to report.Both knees hurt really bad, started hurting across lower back with extreme pain: Caller adds that she got the vaccine on noon that day. At first, right around 6 o'clock in the evening her knees, both knees, hurt really bad. After a few hours, it stopped, and then it started hurting across her lower back with extreme pain. Lower half of body was numb. Caller went to be at 9 pm and went to sleep. She did not want to take anything. Caller adds that she woke up around 1 o'clock in the morning and was going to go to the restroom. When she went to get up, the lower half of her body was numb. Nothing wanted to work right. She tried walking and her legs were not working. Instead of stepping forward, her legs would go to the side or something. She had to lean against a wall to get to the bathroom.  Caller lives along and she does not have help because she was not expecting anything like this. Caller went to the restroom, then to bed, and fell asleep again. She was thinking this was one of the common side effects called being tired, which she did feel tired but that was not it. This was something entirely different.  This sounded like more of a neurological problem according to her doctor. Her doctor does not want her to take the second vaccination because of this and wants her to wait to get it. Her doctor also wanted her to report this. Caller does not know anybody else who has had this happen and it was out of the ordinary. Legs were not working: Caller called it crazy legs, her legs did not want to work. One was worse than the other but it was strange they would not go straight; they would go in different directions. 7:30 the following morning, she was weak and had trouble walking but it was better than it had been at 1:30 in the morning. Caller made herself keep walking and it went away. Both knees hurt really bad, this happened around 6 o'clock pm.  She had nothing up to that point and felt great. Caller confirms she received the vaccination on 12Apr2021 and it was on Monday this occurred. It went away in a couple of hours and completely went away. Started hurting across lower back with extreme pain, little bit of headache on the left side occurred 12Apr2021. What happened was after her knees stopped hurting she got a little bit of a headache on the left side for some reason. Caller adds it is like what she hears people say about migraines. It was just one side. It was not bad and lasted about a half hour. Caller adds it may be of no consequence at all but it did happen and then did not happen ever again. Started hurting across lower back with extreme pain: it was around 9 o'clock at night that her lower back hurt really bad when she was getting ready for bed. he can still feel it a little bit but it is not anything debilitating. It is slowly going away. As far as the pain, it was really bad pain and was a 10+ excruciating pain. It was there until the morning. Caller does not know what point it stopped hurting but she woke up at 7:30 or so and it was not hurting anymore.  She adds that she was achy but the bad pain is gone. Caller adds over the course of the day it stopped hurting all the time.Legs were not working: caller adds she went to get up around 1:30 am 13Apr2021, in the middle of the night, and it went away by the time she woke up. It was mostly gone, she was just weak at that point still.  Caller adds there was no more numbness in her entire lower body from the waist down and that it was very weird.   Weakness got better of the course of the day because she forced herself to keep moving.  She may have scared it away. By the end of the day, she was not having any of this really. Caller adds she was tired the next few days. She did not have quite the stamina but she understood that this might be a side effect a lot of people have. She does not have this anymore. Legs were not working, Weakness: Caller adds that she woke up trying to go to the restroom and was trying to get there. She could not walk like she stumbled like a drunk person in a movie. She was able to get to her bathroom right next to her bedroom anyways but it was only a few steps. She had to lean against the wall and halfway crawl. She could not stand up or walk straight. By the end of 13Apr2021, this had stopped completely. She did not have problems really when she woke up in the morning at 7:30ish the 13th, she felt tired and weak so she had trouble walking because she felt weak. Caller adds that it was not because of her legs feeling crazy and they were not feeling crazy at that time. Caller states there were other things that were not really as bad as what was already talked about, those were the main things. On the 2nd day, on 13Apr2021 she had pretty bad pain in her right wrist. She got the shot on the left side. She does not know if this has anything to do with it.  She never had redness or swelling or pain from there she got the vaccination. The other side of her wrist started hurting later in the day from her wrist to her elbow and then her shoulder. A couple of hours, it was extreme pain in that and then all of a sudden it just stopped like somebody flipped a switch. After a couple of hours, it just turned. Caller adds the vaccine was in her left and the pain was on the right. It very suddenly stopped and then she did not have any more problems with that. she then had lymph node swelling later in the day but that has gone away. It was on the right side and was on 13Apr2021. This went away the same day. Within hours, it went away. Caller adds that is everything, and that everything went away in a few days and none of it has reoccurred and she would say she is fine then. The lab tests included Blood test: done now (She had to have bloodwork done every 6 months) on an unspecified date in Apr2021, Pain assessment (excruciating pain): 10+ (As far as the pain, it was really bad pain).  The outcome of She could not stand up or walk straight, Lymph node swelling was resolved on 13Apr2021. The outcome of As far as the pain, it was really bad pain was resolved on an unspecified date, she was achy, One was worse than the other but it was strange they would not go straight; they would go in different directions., This sounded like more of a neurological problem according to her doctor was unknown. The outcome of Both knees hurt really bad was resolved on 12Apr2021. The outcome of other events was resolving.  No follow-up attempts are possible. No further information is expected.