numbness in his body; fast heart beat for a minute or two a minute; strong stinging in his armpit; strong stinging in injection site; extreme pain and swelling in his armpit; extreme pain and swelling in his armpit; This is a spontaneous report from a contactable pharmacist. This pharmacist (patient's mother) reported that, a 13-years-old male patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Solution for injection, Batch/Lot Number: EW0175, Expiry Date: Unknown), via an unspecified route of administration, administered in Arm Left on 10May2021 around 5:30PM-6:00PM (at the age of 13-years-old) as a single dose for covid-19 immunization (to prevent the Covid 19 virus) at Pharmacy. The patient's concomitant medications were not reported. Patient's Medical History (including any illness at time of vaccination) were None. Prior Vaccinations (within 4 weeks) or any other vaccinations within four weeks prior to the first administration date of the suspect vaccine and event following prior vaccinations were None. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available) were none. Additional Vaccines Administered on Same Date of the Pfizer Suspect and all vaccines administered on same date with the Pfizer vaccine considered as suspect were none. Other Products and patient History were None. On 10May2021, immediately after receiving the Covid 19 vaccine, the patient experienced numbness in his body, fast heartbeat for a minute or two a minute, strong stinging in his armpit, strong stinging in injection site, extreme pain and swelling in his armpit. Mother reported on behalf of son received the first dose of the Pfizer BioNTech Covid 19 vaccine on 10May2021 (Received Covid 19 vaccine at 13 years old). Immediately he had numbness in his whole body for 5-10 minutes. He had a fast heartbeat for a minute or two a minute after the vaccine but then that went away. He also had stinging at his injection site and extreme pain and swelling in his armpit that lasted the rest of the day and into the next day the 11May2021. His armpit was so painful he was crying, she put a warm compress on it and gave him alternating tylenol and motrin/2 advil. She asked, if he can get the second dose and was worried the second dose will be worse. She was reported about the Covid 19 vaccine. She's calling on behalf of her son. He received his first Covid 19 vaccine on Monday, 10May2021. After he received the Covid 19 vaccine he felt numb in his body and a strong stinging in his armpit and the injection site. He felt numb in his body for about 5 to 10 minutes. The stinging in his armpit continued through the night and into the next day, 11May2021. She was asking if her son should receive the second Covid 19 vaccine or not. She reported she was a pharmacist.Therapeutic measures were taken as a result of strong stinging in his armpit, strong stinging in injection site and extreme pain and swelling in his armpit. Event did not required visit to, Emergency Room or Physician Office. Relevant Tests done were None. Reporter seriousness for the events was unspecified. Outcome of the numbness in his body and fast heartbeat for a minute or two a minute were resolved on 10May2021, whereas strong stinging in his armpit, strong stinging in injection site, extreme pain and swelling in his armpit were unknown.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-2021734190 similar report from same reporter