nauseous; had threw up while drinking her protein shake; experienced body ache specifically on middle and lower back pain; experienced body ache specifically on middle and lower back pain; Arm was sore; tired; kidney infection; autoimmune; This is a spontaneous report received from a contactable consumer (patient). A 33-years-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), dose 1 via an unspecified route of administration, administered in arm left on 28May2021 15:00 (Batch/Lot Number: EW0186) at age of 33-years-old as single dose for COVID-19 immunisation. Medical history included ongoing Hashimoto's disease from 2018, ongoing blood iron decreased from May2021. Both of her parents had hypertension and both took medication to manage that. Patient didn't have high blood pressure at all. Concomitant medication included ferrous bisglycinate (IRON BISGLYCINATE, Manufacturer: Megafood, Expiry Date; Jan2024) taken for low Iron from May2021 and ongoing. Patient reported that she normally takes the iron in the morning. She has been taking the iron for about a month. No additional vaccines administered on same date of the Pfizer suspect. No prior vaccinations (within 4 weeks). The patient experienced kidney infection (medically significant) on an unspecified date in 2021 with outcome of unknown, autoimmune (medically significant) on an unspecified date in 2021 with outcome of unknown, experienced body ache specifically on middle and lower back pain in Jun2021 with outcome of not recovered, middle and lower back pain on 04Jun2021 or 05Jun2021 with outcome of not recovered, nauseous on 04Jun2021 with outcome of recovered on 10Jun2021, tired on an unspecified date in 2021with outcome of unknown, had threw up while drinking her protein shake on 04Jun2021 with outcome of recovered on 04Jun2021, arm was sore on 28May2021 with outcome of recovered on 29May2021. AE did not require a visit to emergency room and physician office. Clinical course reported as follow: Patient reported that she has been experiencing a middle and lower back ache. It started happening the last few days. She also experienced being tired and nauseous. She threw up her protein shake which she described as "random". She didn't experience any side effects at all for the first 5-6 days. The last few days, starting last Friday, 04Jun2021 or Saturday, 05Jun2021, was when she started feeling achy. Patient reported that her back ache was not excruciating pain, it was just discomfort to the point where she needs to take ibuprofen or something. Her back ache was a dull, aching pain. Her lower back felt like when you get your period and have cramping, but her period was not due until 23Jun2021, so she knew that she was not about to have her period soon. She did have her period when she got the vaccine. She never had a fever. Her mom was also a nurse. She asked her mom if she could be experiencing side effects from the COVID-19 vaccine and her mother informed her that she didn't think it was related to the vaccine because the caller would have gotten the side effects within 12 hours of getting the vaccine. She did have an autoimmune condition and she was not sure if what she was experiencing was inflammation because she already has that autoimmunity going on in her body. Her back didn't ache like that typically. She hasn't done any type of exercise or strenuous lifting to experience that soreness in her back. She thought maybe her kidneys were what was causing the pain. She thought maybe she had a kidney infection or a UTI. She didn't have a fever and usually fever is an indication of infection. Her back ache and nausea started on Friday, 04Jun2021, or Saturday, 05Jun2021. Her nausea lasted 2 days or so. She was not feeling any nausea at time of call on 10Jun2021. She vomited just the one time last Friday, 04Jun2021. She was trying to rationalize it, because she's been taking iron supplements and took the iron on an empty stomach. Maybe that's why she threw up, but she didn't know. The only side effect she experienced immediately after the Covid-19 vaccine was that her arm was sore for 2 days and that was it. She has been taking the iron for the last month and it was weird that she had the extreme nausea and threw up her protein shake. She got her thyroid levels checked twice per year. She went last month, May2021, and when her physician did her bloodwork, he said her iron was low. She has blood work done twice annually to check her levels for her Hashimoto's. Her Hashimoto's has improved per her May2021 bloodwork. Her antibodies used to be in the 2000's and when she had the test last month, May2021, it was 600.