Left knee pain with effusion; I can't stand for too long; start getting knee pain on my left knee/and then it moved to my other knee; after time my back started hurting; also my ankles were swollen; hurting and then it moved to my other knee and one of my fingers; I was in pain; This is a spontaneous report received from contactable reporter(s) (Consumer or other non-HCP and Physician).  A 21-year-old female patient (not pregnant) received bnt162b2 (BNT162B2), intramuscular, administered in arm right, administration date 26May2021 10:22 (Lot number: EW0178) at the age of 21 years as dose 1, single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. The following information was reported: DYSSTASIA (non-serious) with onset 18Jun2021, outcome "not recovered", described as "I can't stand for too long"; ARTHRALGIA (non-serious) with onset 18Jun2021, outcome "not recovered", described as "start getting knee pain on my left knee/and then it moved to my other knee"; BACK PAIN (non-serious) with onset 18Jun2021, outcome "not recovered", described as "after time my back started hurting"; JOINT SWELLING (non-serious) with onset 18Jun2021, outcome "not recovered", described as "also my ankles were swollen"; PAIN IN EXTREMITY (non-serious) with onset 18Jun2021, outcome "not recovered", described as "hurting and then it moved to my other knee and one of my fingers"; PAIN (non-serious) with onset 18Jun2021, outcome "not recovered", described as "I was in pain"; JOINT EFFUSION (non-serious) with onset 22Jun2021, outcome "not recovered", described as "Left knee pain with effusion". The events "i can't stand for too long", "start getting knee pain on my left knee/and then it moved to my other knee", "after time my back started hurting", "also my ankles were swollen", "hurting and then it moved to my other knee and one of my fingers", "i was in pain" and "left knee pain with effusion" were evaluated at the physician office visit and emergency room visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of dysstasia, arthralgia, back pain, joint swelling, pain in extremity, pain, joint effusion.  Additional information: There was no other vaccine in four weeks. There were no other medications in two weeks. To begin with, on 18Jun2021 I start getting knee pain on my left knee I let time past I thought I hurt myself or something and then after time my back started hurting and then it moved to my other knee and one of my fingers so then I went to the ER and they didn't find nothing in my knees and also my ankles were swollen for a few months. Then I went again cause it got worst and I was in pain. Till this day my body still hurts and I can't stand for too long I feel like I was standing for so long and it's only been 20 mins. The patient had not got COVID prior vaccination. The patient was not tested for COVID, post vaccination. There were no known allergies. The prior vaccinations (within 4 weeks) were reported as None. There was family history related to AE. The patient received treatment as rheumatology (rheum) following on prednisone (pred-conservatively) and sulfasalazine.  No follow-up attempts are needed. No further information expected.