tingling in his hands; fingers felt numb; weakness in the left arm/shoulder; significant strength loss; This is a spontaneous report from a contactable consumer (patient) or other non hcp.   A 36-years-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot Number: EW0176; Expiration Date: Aug2021), dose 1 via an unspecified route of administration on 06May2021 (at the age of 36 years old) as  dose 1 single, and dose 2 via an unspecified route of administration, administered in Arm Left on 27May2021 (Batch/Lot number was not reported) as dose 2 single both for COVID-19 immunisation.The patient medical history and concomitant medications were not reported. On an unspecified date in May2021 patient had significant strength loss. on an unspecified date patient experienced tingling in his hands, fingers felt numb, weakness in the left arm shoulder. He works as a personal trainer and works out all the time. used to shoulder press 145 pounds and now it's about 95 pounds. did some range of motion exercises today and he just everything go by in May thinking it will get better, but this has been going on the whole month.thought he would give it a week or two to get better, but it hasn't. does range of motion exercises to see how fast he was, and his right arm goes up over the head effortlessly, but the left arm he has to concentrate really hard once it goes above the head. He took 6-pound weights in each hand to do arm curls and lift it straight over his head side to side and about the third time left arm felt like he was doing 30 pounds or something. He was struggling with the left arm. After that he took a chair that maybe weighed 10-12 pounds from the ground straight over his head with his right arm and then switched to his left arm and he could only get it to about chin level. It felt like his brain is not computing and it has to be a nervous system thing. He knows he could usually do that, but the left arm was struggling trying to keep up. States the loss in strength all started about a week after the second shot. That's when he noticed he went from 145 pounds down to 125 pounds and was able to that for about a week and then he had to go down and now at about 95 pounds and even that is a struggle. Has no problems with the right arm going up; it's the left arm and even now the weight bar is starting to tilt. His left arm used to be the strongest arm. did 60-pound curls with each hand and now can only do 25 pounds on the left arm. the right arm has stayed the same. No other vaccines given the same days as Covid 19 vaccines and no problems with vaccines in past. He had to get the vaccine to work even though he did not feel like it was very trustworthy and now he fully regrets getting it, but he needed to get it in order to work in . No other pain but did have some tingling in his hands and fingers felt numb, but he does not have that anymore, it's just the weakness in the left arm/shoulder. His grip is still there, and he is still able to pick up things and his fingers feel fine. Any movement over the head straight up is way more difficult than it should be. No events required visit to Emergency Room/ physician office and no prior vaccinations received. The outcome of the event significant strength loss was not recovered, weakness in the left arm/shoulder was unknown and outcome of all other events was recovering.