tachycardia; pain on knees; Pain on arm; Pain on muscles; on legs a rash started developing, it was a low purpuric rash/big blood purport spots on legs, thighs and upper body; cannot walk; cannot move arm; feeling all this symptoms like my knees and hands swollen/hands, knees and articulations were completely swollen; feeling all this symptoms like my knees and hands swollen/hands, knees and articulations were completely swollen; unable to make any physical movements; The initial safety information received was reporting only non-serious adverse drug reactions. Upon receipt of follow-up information on [25Jan2022], this case contains serious adverse reactions and all safety information is processed together.  This is a spontaneous report received from contactable reporters (Consumer or other non- HCP) for a Pfizer sponsored program (005570). The reporter is the patient.  A 17-year-old patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), intramuscular, administration date 11Jan2022 (Lot number: 3303680) at the age of 17 years as dose 3 (booster), single for COVID-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: BNT162B2 (Dose 1, Route of administration: Intramuscular, Batch/lot number: EP-1533), administration date: 18Jun2021, for Covid-19 Immunization; BNT162B2 (Dose 2, Route of administration: Intramuscular, Batch/lot number: FA6780), administration date: 12Jul2021, for Covid-19 Immunization. The following information was reported: TACHYCARDIA (hospitalization) with onset 13Jan2022, outcome "recovering", described as "tachycardia"; ARTHRALGIA (hospitalization) with onset 13Jan2022, outcome "recovering", described as "pain on knees"; PAIN IN EXTREMITY (hospitalization) with onset 13Jan2022, outcome "recovering", described as "Pain on arm"; MYALGIA (hospitalization) with onset 13Jan2022, outcome "recovering", described as "Pain on muscles"; PURPURA (hospitalization) with onset 13Jan2022, outcome "recovering", described as "on legs a rash started developing, it was a low purpuric rash/big blood purport spots on legs, thighs and upper body"; GAIT INABILITY (hospitalization) with onset 13Jan2022, outcome "recovering", described as "cannot walk"; JOINT RANGE OF MOTION DECREASED (hospitalization) with onset 13Jan2022, outcome "recovering", described as "cannot move arm"; JOINT SWELLING (hospitalization), PERIPHERAL SWELLING (hospitalization) all with onset 13Jan2022, outcome "recovering" and all described as "feeling all this symptoms like my knees and hands swollen/hands, knees and articulations were completely swollen"; MOVEMENT DISORDER (hospitalization) with onset 13Jan2022, outcome "recovering", described as "unable to make any physical movements". The patient was hospitalized for tachycardia, arthralgia, pain in extremity, myalgia, purpura, gait inability, joint range of motion decreased, joint swelling, peripheral swelling, movement disorder (hospitalization duration: 1 day). The patient underwent the following laboratory tests and procedures: angiogram pulmonary: everything was good; blood fibrinogen: unknown result; blood test: unknown result; c-reactive protein: unknown result; full blood count: unknown result, notes: CBC with differential; human chorionic gonadotropin: unknown result; metabolic function test: unknown result; nucleic acid test: unknown result; red blood cell sedimentation rate: unknown result; sars-cov-2 rna: unknown result; troponin: unknown result; urine analysis: unknown result. Therapeutic measures were taken as a result of tachycardia, arthralgia, pain in extremity, myalgia, purpura, gait inability, joint range of motion decreased, joint swelling, peripheral swelling, movement disorder included sodium chloride 0.9 (flush), iopamodol (ISOVUE 300), methyl prednisolone sod such (PF) (SOLU-MEDROL), Sodium chlorine 0.9% 100 ml bolus and steroids pills. Clinical course: patient had started feeling all this symptom like knees and hands swollen, also muscle pain. Patient cannot walk. Patient can't do anything because of the pain. Everything started 2 days after patient got booster shot. Patient started feeling pain on knees, arms and muscles. It started low, but with time it got much worst. Then, on legs a rash started developing, it was a low purpuric rash that started quickly spreading leaving big blood purport spots on legs, thighs and upper body. Due to the pain, patient could not walk or move arms. Hands, knees and articulations were completely swollen with red rash marks and pain. Taking in count how serious the situation was getting, Patient was immediately transferred to the hospital on (city name). Patient was on wheelchair the whole time and also unable to make any physical movements, the rash spreaded and they were not little marks anymore, they were big maps. On the hospital patient got numerous exams due to the rare case as "CPR, CBS with differential, CMP, CT/NG DNA PCR, D-DIMER quantitive, ESR, Fibrnogen-Plama, POCT Urine HCG, PT/aPTT, SARS-CORONAVIRUS 2 RNA, Tromoponin, Urinalysis. After all this tests, they discovered that patient had tachycardia and to discard any blood clots. Patient got a CTA angiogram pulmonary test, in which everything was good. Patient was administered with: Sodium chloride 0.9 (flush), iopamodol (ISOVUE 300), methyl prednisolone sod such (PF) (SOLU-MEDROL), Sodium chlorine 0.9% 100 ml bolus. After many tests and exams, patient was discharged the next day with steroids pills at home treatment. Patient was still recovering.  No follow-up attempts are possible. No further information is expected.