not able to function; sleeps all day; lost 14 pounds since the second dose of the vaccine/lost another 4 pounds over the weekend; chest hurt; Shortness of breath; fatigued and very weak; fatigued and very weak; Headache; cannot focus on school online; blood pressure goes up and down; heart rate goes up and down; Dizziness; muscle mass depleting; This is a spontaneous report from a contactable consumer (patient's parent). A 17-year-old male patient received BNT162B2 (Pfizer-BioNTech COVID-19 mRNA vaccine), dose 2 via an unspecified route of administration, administered in the right arm, at age 17 years, on 12Apr2021 (Batch/Lot Number: EW0158) as 2ND DOSE, SINGLE DOSE for COVID-19 immunisation. Medical history included pressure in his eye from an injury, asthma (diagnosed when the patient was about 2) and has family members with asthma and heart conditions. Patient is in perfect health, he works out 6 days a week, and does football conditioning 5 days a week. 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) was none. Concomitant medication included timolol taken for pressure in his eye from an injury from an unspecified start date to 20May2021. Additional vaccines administered on same date of the Pfizer Suspect was none. The patient historically received first dose of BNT162B2 (Pfizer-BioNTech COVID-19 mRNA vaccine, Lot Number: EP7534) at the left arm at age 17 years on 22Mar2021 for COVID-19 immunization. The patient got his second dose of the vaccine on 12Apr2021 and shorty after on 19Apr2021, he became very fatigued, very weak, his chest hurt, and he had shortness of breath. On Apr2021, patient had dizziness. The patient used to have bulky arms and now you can see his muscle mass depleting in Apr2021. The patient cannot focus on school online because of the headaches from 19Apr2021. The patient's blood pressure goes up and down from 19Apr2021. For days from 19Apr2021, the patient's heart rate will be fine in the 60s and it goes up to 120 or 130 with chest pain, it fluctuates depending on the day.  The patient visited the emergency room on 05May2021, but was not admitted and no one knows what was going on with the vaccine. It was also reported that the patient lost 14 pounds on 25Apr2021 since the second dose of the vaccine. They knew the patient has already lost 10 pounds and then yesterday, 25May2021, the patient weighed himself and noticed he has lost another 4 pounds over the weekend. Patient had bloodwork on 20May2021 and it was all negative. The primary care provider was concerned about the weight loss so she ran a bunch of blood work. The patient is negative for COVID test and chest x-ray on 21May2021 and he has had multiple tests done. The patient went to his primary care provider on 25May2021 (yesterday from the time off reporting) and the reporter mentioned that maybe can they look at this as being a side effect from the vaccine. The patient's doctor laughed and said nothing has been proven yet about this. The reporter felt that this is a reaction to the vaccine. At the time of reporting on 26May2021, the patient was not able to function and sleeps all day. The patient also underwent lab tests and procedures that includes being tested negative for mono twice now (on unspecified dates). Clarified that they have not filed a safety report with Pfizer on the patient's events. The outcome of the events 'dizziness', 'lost 14 pounds since the second dose of the vaccine/lost another 4 pounds over the weekend', 'muscle mass depleting', 'cannot focus on school online', 'not able to function' and 'sleeps all day' was unknown; while for the other events, it was not recovered.