swollen joints; her back condition and may have "pinched a nerve or something; describes it as the worst pain; the leg pain that she is experiencing and would like to know if it is possible that it could be related to a blood clot; leg pain; also has some tingling on the skin; It feels like a Charley's horse; had a horrible flu; Her every muscles and every joint hurt, and her head hurt; Fever; body aches; chills; joint pain; Her every muscles and every joint hurt, and her head hurt; This is a spontaneous report from a contactable consumer (patient). A 53-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), dose 2 via an unspecified route of administration, administered in left arm on 07Apr2021 at 14:00 (Batch/Lot number was not unknown; Expiration Date: 31Jul2021), at age of 53 year-old, as 0.3 mL single, for Covid-19 immunisation. Medical history included liver disease from 2016 and ongoing. There were no concomitant medications. The patient previously took the first dose on 17Mar2021 for Covid-19 immunization and experienced fever. The patient received her second dose of the Pfizer BioNTech COVID-19 vaccine on 07Apr2021 and reports having side effects after. She is specifically worried about the leg pain that she is experiencing and would like to know if it is possible that it could be related to a blood clot and if she needs to be worried about it. She stated that with the "swollen joints" and everything from the vaccine, it is possible that it worsened her back condition and may have "pinched a nerve or something." She describes it as the worst pain she's ever felt in her life and states it "comes out of the blue" so she does not have time to prepare for it. She likens it to a "Charley horse" but a "really bad one" that goes away and has no pain afterwards. She states she is scheduled for an MRI next week of her lower back to investigate. The patient also mentions that she thinks she had COVID-19 at the time of her vaccine because "when I got the shot, I had a super strong response." On 07Apr2021, the patient had body aches, chills, she was on the couch for quite a while. The joint pain was incredible, even in her toes. She felt like she had a horrible flu. Her every muscles and every joint hurt, and her head hurt. She was on the couch for like 4 days. On day 3 or 4 she developed intermittent pain in the leg and shin on 08Apr2021. It feels like someone is drilling a jackhammer in it. It feels like a Charley's horse, but not, more like it's in the bone. She didn't associate it with the vaccine at first, even though she had never had this pain before until she got the vaccine. She said that she has had some back problems and scheduled a MRI to see if she had pinched nerve or something. On 08Apr2021, she also has some tingling on the skin. She read about side effects of blood clots and doesn't know if this leg pain could be related to a blood clot. She assumed it could be from her back. She read that with blood clots there is usually an ache and discoloration, which she does not have now. She also read that intermittent Charley's horse could have something to do with blood clots. She has pins and needles on the skin. She also had a headache after the vaccine, but she does not have it now. She said that the pain in her leg that shoots on and bangs in her tibia hurts when bending over, lifting her leg to her chest, squatting to pick up something, and going up and down the stairs. She said that the pain is horrible and it is worse than leg pain, it is worse than a charley horse, it is the worst pain she has ever felt in her life. She cannot stop screaming when it happens. States with the joint pain that she had, there may be a nerve that's being pressed on her back. She said that with all of the information being reported in the news about blood clots, she asked is that something she needs to be concerned about. She said that she did a virtual visit with her doctor and notified her of the leg pain and asked the doctor to schedule her for an MRI because of the pain. She stated her hemoglobin and hematocrit, MCV are high.  She also said that the clotting is affecting her red blood cells. She ran a fever with the first vaccine, but she had a high fever between 103-104 degrees Fahrenheit after the second vaccine that stopped on 12Apr2021 or 13Apr2021. Her high fever lasted for about 3 days. She had a low grade fever that lasted for about a week. Her body aches resolved completely on 12Apr2021 or 13Apr2021. Her joint pain is in her back and elbows. She also had lot of joint pain in her shoulder and arm and radiates to her neck on the left side. She still has some muscle pain in her leg, but overall her muscle pain is gone. For treatment she used Ibuprofen 600 mg by mouth and fluids. The day before her shot, her son called and told her he tested positive for covid. She got a PCR test immediately on 07Apr2021 and the next day she was told it was negative. She thinks she might have tested too soon. She also says her response to it was so strong, she must have been getting covid and didn't know it. She might have tested negative because she had the first shot already. She wasn't worried about exposing others and went to get her second shot, but she got really sick after that and it kicked her butt pretty hard. The outcome of the events for leg pain and tingling on skin was not recovered, fever, body aches and headache recovered in Apr2021, chills on 11Apr2021, muscle hurt/pain on 12Apr2011, joint pain was recovering, and outcome of other events was unknown.