He experienced pain in his arm that lasted a few hours/Pain in arm; But he is experiencing now muscle pain; A lot of pain in his back/he began experiencing back pain/Pain in back/Back pain stopping him from doing his chores and getting along; Tightness in his back/ back tightness; Pressure in his back/Some days it's a throbbing pain and other days I can't do a whole lot like my back is tied up; All I did was stay in the bed, I didn't have the strength to get up and nothing help me yet.; Some days it's a throbbing pain and other days I can't do a whole lot like my back is tied up; Couldn't move; Fluid leaking from injection site; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 47 year-old male patient received bnt162b2 (BNT162B2), administration date 13Jun2021 (Lot number: EW0217) at the age of 47 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Irregular Heartbeat" (ongoing); "High blood pressure" (unspecified if ongoing). Concomitant medication(s) included: XARELTO taken for anticoagulant therapy (ongoing). The following information was reported: PAIN IN EXTREMITY (non-serious) with onset Jun2021, outcome "unknown", described as "He experienced pain in his arm that lasted a few hours/Pain in arm"; MYALGIA (non-serious) with onset Jun2021, outcome "unknown", described as "But he is experiencing now muscle pain"; BACK PAIN (non-serious) with onset Jun2021, outcome "not recovered", described as "A lot of pain in his back/he began experiencing back pain/Pain in back/Back pain stopping him from doing his chores and getting along"; MUSCLE TIGHTNESS (non-serious) with onset Jun2021, outcome "not recovered", described as "Tightness in his back/ back tightness"; MUSCULOSKELETAL DISCOMFORT (non-serious) with onset Jun2021, outcome "unknown", described as "Pressure in his back/Some days it's a throbbing pain and other days I can't do a whole lot like my back is tied up"; ASTHENIA (non-serious) with onset Jun2021, outcome "unknown", described as "All I did was stay in the bed, I didn't have the strength to get up and nothing help me yet."; PAIN (non-serious) with onset Jun2021, outcome "unknown", described as "Some days it's a throbbing pain and other days I can't do a whole lot like my back is tied up"; HYPOKINESIA (non-serious) with onset Jun2021, outcome "unknown", described as "Couldn't move"; INJECTION SITE EXTRAVASATION (non-serious) with onset Jun2021, outcome "unknown", described as "Fluid leaking from injection site".  Additional information: Patient did not receive any prior vaccinations within four weeks prior to the first administration date of the suspect vaccine. Caller stated that he received the Pfizer Covid 19 vaccine, he experienced pain in his arm that lasted a few hours, but he was experiencing now muscle pain, a lot of pain in his back, pressure in his back. Has this been reported before. Caller was difficult to understand and the audio had low quality during the call. States that he received the vaccine.  He had some pain in his arm and fluid leaking out from the site.  A couple of hours later he felt pain in his back.  He also had tightness in his back.  He was in bed the whole day.  The tightness was so that he could not move.  States he is still having this but not as extreme.  States that it takes a lot of effort to move around.  He is wondering if anyone else has mentioned this after having the vaccine. States that he called the pharmacist; but they could not give him any advice. Caller asks has anyone else had back problems, states that it is stopping him from doing his chores and getting along. Caller states that the symptoms began maybe 17-16 hours after the vaccine.  Maybe 20 hours later. Patient did not visit emergency room and physician office for the events. Caller reports that he received his first dose of the Pfizer Covid-19 vaccine on 13Jun2021 and approximately 20 hours after, he began experiencing back pain and back tightness. He states  "I want to get out and move, sit up". He reports the following day after vaccination "All I did was stay in the bed, I didn't have the strength to get up and nothing help me yet. " Caller states "some days it's a throbbing pain and other days I can't do a whole lot like my back is tied up". Caller continues to say that he didn't go to the emergency room, but "probably could have gone", "didn't take anything". Caller states he received the shot in his arm, but his back was sore. He states he called pharmacy, but they didn't have recommendations. Caller asks "if anyone else has reported back pain after the vaccine.  Follow-up attempts are completed. No further information is expected.