She had soreness at the COVID-19 Vaccine injection site with the second COVID-19 Vaccine shot; She noticed after her second COVID-19 Vaccine shot that she had muscle pain in her opposite arm (left arm); Her left arm muscle felt very uncomfortable when she lifted her arm; This is a spontaneous report from a contactable consumer. A 58-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number: EW0185, Expiration date was not reported), dose 2 via an unspecified route of administration, administered in Arm Right on 16Jun2021 10:56 (Age at vaccination 58Years) as dose 2, single for covid-19 immunisation. Medical history included type 1 diabetes mellitus from 1996 and ongoing (Verbatim: Type 1 diabetes mellitus). The patient's concomitant medications were not reported. The patient previously took dose 1 bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Lot Number: EW0167, Expiry Date: 31Aug2021), via an unspecified route of administration, administered in Arm Right on 26May2021 as dose 1, single for covid-19 immunisation and She had soreness at the COVID-19 Vaccine injection site with the first COVID-19 Vaccine shot. The patient did not receive any other vaccines within four weeks prior to the vaccination. The patient experienced she had soreness at the covid-19 vaccine injection site with the second covid-19 vaccine shot 16Jun2021, she noticed after her second covid-19 vaccine shot that she had muscle pain in her opposite arm on Jun2021, her left arm muscle felt very uncomfortable when she lifted her arm on Jun2021. Reporter stated, wanted to know about a side effect she may have experienced. She clarified both COVID-19 Vaccine shots were given in her right arm. She said the soreness (in her right arm) went away after 1-2 days with both COVID-19 Vaccine shots. She said the healthcare professional, who gave her the second COVID-19 Vaccine shot, told her 01Jul2021 would be the day the COVID-19 Vaccine would be complete (2 weeks after her second COVID-19 Vaccine shot). She said she regularly did stress training with weights. She said she guessed she always felt the left arm muscle pain (after she had her second COVID-19 Vaccine shot). She said her left arm muscle was a little sore, but she noticed the left arm muscle soreness even more while training during the last week of Jun2021 (starting around 28Jun2021). She said she was wondering why she would have pain in her left arm muscle, since she was given both COVID-19 Vaccine doses in her right arm. She asked if anybody else had reported that kind of side effect.The patient underwent lab tests and procedures which included blood test was unknown on 08Jun2021 (to test parathyroid level and calcium levels). Patient received treatment for Left Arm Muscle Pain she applied Biofreeze (gel) on her left shoulder Monday (05Jul2021) and Tuesday (06Jul2021) and her left arm muscle was not as painful as it was prior to that. (Lot Number: 33720-70 Expiry Date: Nov2023), Right Arm Injection Site Pain Treatment was Declined any. The outcome of event vaccination site pain was recovered on Jun2021,Muscle pain was recovering and Her left arm muscle felt very uncomfortable when she lifted her arm was unknown.  Follow-Up (27Jul2021): Follow-up attempts are completed. No further information is expected.