it hurt to walk. Her ankles felt like they were going to snap/ankle pain. When she walked it hurt. It felt like her ankles were going to snap; muscle and joint tightness; muscle and joint tightness; she just lost a bunch of weight; on her right ankle on the inside of the ankle bone and about 4 inches above that she had bright pink mark; had pain in the arm where the shot was given in the shoulder area. It was very painful when she got the shot. It felt like it went in the bone; heart rate went up; breathing was heavier than usual; entire night and into the morning she was woken by both of her legs, calves, and ankles terribly cramping; tightness in her neck at the hairline that came around the left side where her carotid artery is; tightening in her left arm where she got the shot down into her wrist; it hurt to walk. Her ankles felt like they were going to snap/ankle pain. When she walked it hurt. It felt like her ankles were going to snap; She started having horrible pain yesterday in her right arm; This is a spontaneous report from a contactable consumer (patient). A 56-years-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number: EN6201), via an unspecified route of administration, administered in left arm on 17Feb2021 (at the age of 56-years-old) as DOSE 1, SINGLE for covid-19 immunisation. The patient medical history included diverticulitis, upper respiratory infection that every year she gets a terrible upper respiratory infection and this winter she did not surprisingly, but she did in 2020  and walking pneumonia before too and she thought it was important to get the vaccine. The patient's concomitant medications were not reported. The patient had no prior vaccinations within 4 weeks. On 17Feb2021, shortly after vaccination when she was sitting during the waiting time, she felt like her heart rate went up and her breathing was heavier than usual. The nurse checked her pulse and said every-thing was fine. She sat for a longer amount of time. On Feb20021, that night when she went to bed she was awaken within an hour having leg cramps. She doesn't ever get leg cramps. She drinks water all day long. She drinks a lot of water. She wasn't dehydrated at all. The entire night and into the morning she was woken by both of her legs, calves, and ankles terribly cramping. She would wake up in a stretching position. Then around nine when she got out of bed it hurt to walk. Her ankles felt like they were going to snap. She took it easy that day and sat on the couch with her feet up. On Feb20201, the patient had pain in the arm where the shot was given in the shoulder area. It was very painful when she got the shot. It felt like it went in the bone. She had read to expect her arm to be sore. Then she had this tightening in her left arm where she got the shot down into her wrist. Her arm felt like she had a major workout. It felt tight like it was going to burst. Nothing like she had felt before. She had tightness in her neck at the hairline that came around the left side where her carotid artery was. It was very tight. No breathing issues but muscle and joint tightness. That actually lasted throughout the day. Then the next day she continued to have the ankle pain. When she walked it hurt. It felt like her ankles were going to snap. On Feb2021, she noted a spot left, but the other spots have gone. On her legs on 18Feb2021, after she had all the cramping, on her right ankle on the inside of the ankle bone and about 4 inches above that she had bright pink mark. It was a little smaller than a dime. On the right side of the right ankle, just barely above the bone, she has a bright red mark. It was about probably three fourths of an inch long and perfect rectangle. On the left leg above the ankle there was a spot. The other spots on the right were still there. On the left side of the left ankle just 3 inches above the bone she has a bright mark. That has remained with her but it is starting to dissipate. They are now the colour of a scar. They are turning a purplish and pinkish colour now. Today she hasn't had any of the side effects but it was up until yesterday it hurt to walk. She started having horrible pain yesterday in her right arm. She would just be massaging and rubbing her forearm area and it worked its way into the upper arm. It was bizarre. It was that whole tight pressure like someone squeezing from the inside out. It was really painful. Then the pain went down into her hand. It just felt like pressure, like it was going to burst. Never has she had something like this. she just lost a bunch of weight. The patient underwent lab tests and procedures which included weight with result she just lost a bunch of weight and pulse result as normal and heart rate: went up on 17Feb2021 and nurse said everything was fine. The patient did not had any AE(s) following prior vaccinations. Patient did not any AE(s) require a visit to emergency room and physician office. The outcome of the events were unknown.   No follow up attempts are possible. No further information is expected.