inflammation in his intestines and his stomach; petechial rash on his legs, which is still getting a little bit worse; HSP; stomach pain/extreme stomach pain started again and so on/intermittent stomach pain/lower left abdominal pain; lower left abdominal pain and he doubled over in pain and started vomiting; Caller states again he had intermittent pain throughout the day; vomited about three times in total, it wasn't like excessive vomiting; didn't feel well/feel sick again; This is a spontaneous report from a contactable consumer (patient's parent). A 13-year-old male patient received the first dose of BNT162B2 (PFIZER COVID-19 VACCINE, lot number: EW0164, expiration date: 31Aug2021), at the age of 13 years old, in left arm on 14May2021 16:00 at single dose for covid-19 immunisation. The patient medical history was not reported. The patient was a normal 13 years old, he doesn't take anything, he's active. The patient did not receive any other vaccines within 4 weeks prior to vaccination. The vaccines administered on same date with BNT162B2 was none. The previous immunization with the Pfizer vaccine was none. The patient previously received the flu shot every year and experienced no adverse event. On 16May2021, about 48 hours after the vaccination, the patient started having stomach pain in the middle of the night. It began 16May2021 in the evening and into 17May2021, the patient was having stomach pain and not feeling well. Reporter stated the patient woke her up. Reporter stated they thought it was some food he ate. Reporter stated they tested his covid antibodies and they also personally at home on 17May2021 night, they tested him with a home kit for covid just to double check because nobody really brought it up and it was negative also. Reporter confirmed the home covid test was done on 17May2021. Reporter stated there was no known exposure, they just did it to make sure he didn't have covid. The patient was taken to the emergency room on 18May2021. Reporter stated they were waiting because patient felt good during the day and they thought nothing was wrong, but then the extreme stomach pain started again and so on 18May2021, she took him to the local emergency room. Reporter stated they didn't do much other than push on his stomach, she was worried about appendicitis. Reporter stated they didn't worry too much, but she thought maybe it was his appendix. The doctor examined him and said he had a stomach issue and released him with medicine and that was the 18May2021. On 19May2021 and 20May2021, the patient would get intermittent stomach pain, again thinking it was a stomach bug or something. On 20May2021, the patient experienced petechial rash on his legs. Reporter called the pediatrician and again the patient was having intermittent stomach pain and kept having it intermittently. The patient would feel fine then feel sick again then on the 22May2021, the patient had more bad stomach pain and some vomiting so he wound up back in the emergency department, it was a different one than the first on 22May2021. The patient did a lot of blood work, his labs came back good, but he did not do a CAT scan, but reporter tried to do everything else, tested patient for covid, antibodies and everything and they sent him home again on the 22May2021. The patient had intermittent pain again throughout 23May2021 then on 24May2021, he went to visit the pediatrician just for a visit and they were thinking its Henoch-Schonlein purpura (HSP) which is an autoimmune response and they still didn't have a diagnosis for his stomach. Reporter stated patient was perfectly fine at the pediatrician, then when they got home, he started having lower left abdominal pain and he doubled over in pain and started vomiting. The patient vomited about three times in total, it wasn't like excessive vomiting. Reporter stated the pain would bring it on, he does have a rash, which is still getting a little bit worse. Reporter stated they took him back to the emergency room, they did a CAT scan and that showed he had inflammation in his intestines and his stomach so they kept him in the hospital. The patient was admitted on 24May2021 when he visited the emergency room for the third time. Reporter stated because patient was in pain, they admitted him to watch him. Reporter stated they were worried about the patient having intussusception with the bowel, where his bowel can go inside each other and can create a blockage, so they wanted to admit him to make sure that didn't happen. Reporter stated the worst of the stomach pain was on 25May2021, which would have been at 19:00. The patient had not had an episode since then, he hadn't had an attack like that since. The whole week before from 17May2021, or the 16May2021 when it started through 25May2021, it was very intermittent of a lot of pain. So far, knock on wood, the patient hadn't had it since 25May2021 at 19:00 and hopefully tonight it won't happen. Reporter stated it will be about 48 hours of not having the bad pain. Reporter stated he still has some pain, but not like where she had to rush him to the emergency room. The patient's vomiting ended on 24May2021 or 25May2021. He had recovered completely from vomiting so far. The patient was released on 26May2021 with a diagnosis of HSP, which was an auto immune response, and he'd never had this happen before. Reporter stated if she googled HSP, it said it can still get worse, but it was not the worst case of HSP. Reporter stated the patient has never had anything like this before, he was perfectly fine, they made it through covid and didn't get covid and he is a healthy kid so she thought Pfizer should know. The outcome of the events HSP, stomach pain, petechial rash was not recovered. The outcome of vomiting was recovered on 24May2021 or 25May2021. The outcome of the events inflammation in intestines and stomach, didn't feel well/feel sick, intermittent pain and lower left abdominal pain was unknown.  No follow-up attempts are needed. No further information is expected.