Complaining of chest pains primarily when she breath in and out not in between breaths; Reporting some blood in the saliva coming out; a lot of anxiety; heavy breathing; This is a spontaneous report from a contactable consumer (patient's father) received via Pfizer sponsored program.   A 12-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; solution for injection, Lot Number: Unknown), via unspecified route of administration, on an unspecified date Aug2021 as a dose 1, single for COVID-19 immunization. The patient medical history included fear of needles. There was no concomitant medications was not reported. The patient was not related to a study or programme. The patient had not history of all previous immunization with the Pfizer vaccine considered as suspect. No additional vaccines administered on the same date of the Pfizer suspect. The patient had not received any other vaccine four weeks prior to covid-19 vaccine. The patient had not illness at time of vaccination. On an unspecified date of Aug2021 the patient experienced a lot of anxiety, heavy breathing. On an unspecified date the patient experienced complaining of chest pains primarily when she breath in and out not in between breaths and was reporting some blood in the saliva coming out. The reporter stated about his 12-year-old daughter who may or may have not had the Pfizer Covid 19 vaccine. He isn't sure if she received the Pfizer Covid 19 vaccine or another manufacturers Covid 19 vaccine. He stated that he was not present when his daughter received the vaccine. His daughters mother told him that it was the Pfizer Covid 19 vaccine. His daughter's aunt was the person present when his daughter received the Covid 19 vaccine. His daughter did have the approval of her mother and apparently, she only needed one parents permission. He was just told yesterday, 25Aug2021 that his daughter had gotten the vaccine. He thought she may have received the vaccine on the 24Aug2021, but he isn't sure. He knew she received the vaccine recently; it cannot be more than 10 days ago because she was with him 10 days ago. He does not know the exact date his daughter received the Covid 19 vaccine. He stated that his daughter heard something about children and heart inflammation and in her mind, she was though her heart was growing. He does not know if what his daughter was experiencing was real or in her mind. He stated things that affect the mind also affect the health. He reported that his daughters mother opted not to take his daughter to the doctor. His daughter had seen a report that the Covid 19 vaccine was causing swelling and inflammation in heart tissues and his daughter was concerned and it was affecting her breathing and she was having a lot of anxiety. She was having heavy breathing when he spoke to her on the phone, but he didn't hear any phlegm or mucus build up or coughing, just heavy deep breaths. He reported the last couple of weeks he had been talking to his daughter's mother and he thought they were waiting for more evidence with children his daughters age and the Covid 19 vaccine. His daughter has been talking to him about getting the Covid 19 virus and spreading it and she had been terrified she would get the Covid 19 virus. She felt like it was her duty to get the Covid 19 vaccine. He stated the previous agent told him that Pfizer was not recommending the Covid 19 vaccine be given to children under the age of 16. He stated maybe she received a different Covid 19 vaccine. But his daughter's mother was adamant when he asked her if it was the Pfizer Covid 19 vaccine and she said it was the Pfizer Covid 19 vaccine. He was wondering if the Covid 19 vaccine has been approved for 12-year-old children. The reporter stated that patient was complaining of chest pains primarily when she breath in and out not in between breaths. She was reporting some blood in the saliva coming out and the reporter made appointment for her doctors but wanted to inform about patient condition to Pfizer. These adverse events did not resulted in Emergency Room/ Physician Office visit. No relevant test reported. No investigation assessment was reported. Outcome for all the reported events was unknown.  The lot/batch number was not available despite the follow-up attempts made. Follow-up attempts completed. No further information was expected.