fainted in shower; Interchange of vaccine products; may have "long- covid"; migraines; diminished smell continues; fatigue; nausea; joint pains; burning sensation legs/arms; muscle pains; dizziness; blurry vision; loss of appetite; menstrual irregularities- delay/ early; menstrual irregularities- delay/ early; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP).  A 42-year-old female patient (not pregnant) received BNT162b2 (BNT162B2), on 23Jul2022 as dose 4 (booster), single (Lot number: FJ4991) for covid-19 immunisation. The patient's relevant medical history included: "endometriosis" (unspecified if ongoing); "severe varicose veins with treatment" (unspecified if ongoing); "bell's palsy" (unspecified if ongoing). The patient took concomitant medications. Vaccination history included: Moderna covid-19 vaccine (DOSE 1, SINGLE, happened after receiving each vaccine and is occurring now.), administration date: Feb2021, when the patient was 41 years old, for COVID-19 immunization, reaction(s): "diminished smell continues", "joint pains", "burning sensation legs/arms", "burning sensation legs/arms", "loss of appetite", "dizziness", "fatigue", "menstrual irregularities- delay/ early", "migraines", "muscle pains", "nausea", "fainted in shower", "blurry vision"; Moderna covid-19 vaccine (DOSE 2, SINGLE, happened after receiving each vaccine and is occurring now.), administration date: Feb2021, when the patient was 41 years old, for COVID-19 immunization, reaction(s): "fainted in shower"; Moderna covid-19 vaccine (DOSE 2, SINGLE, happened after receiving each vaccine and is occurring now.), administration date: Mar2021, when the patient was 41 years old, for COVID-19 immunization, reaction(s): "diminished smell continues", "joint pains", "burning sensation legs/arms", "burning sensation legs/arms", "loss of appetite", "dizziness", "fatigue", "menstrual irregularities- delay/ early", "migraines", "muscle pains", "nausea", "blurry vision"; Moderna covid-19 vaccine (DOSE 3 (BOOSTER), SINGLE, happened after receiving each vaccine and is occurring now.), administration date: Oct2021, when the patient was 42 years old, for COVID-19 immunization, reaction(s): "diminished smell continues", "joint pains", "burning sensation legs/arms", "burning sensation legs/arms", "dizziness", "fatigue", "migraines", "muscle pains", "nausea", "fainted in shower", "blurry vision"; Moderna covid-19 vaccine (DOSE 3 (BOOSTER), SINGLE, happened after receiving each vaccine and is occurring now.), administration date: Feb2021, when the patient was 41 years old, for COVID-19 immunization, reaction(s): "loss of appetite"; Moderna covid-19 vaccine (DOSE 1, SINGLE, happened after receiving each vaccine and is occurring now.), administration date: Oct2021, when the patient was 42 years old, for COVID-19 immunization, reaction(s): "menstrual irregularities- delay/ early".  The following information was reported: SYNCOPE (medically significant), outcome "not recovered", described as "fainted in shower"; INTERCHANGE OF VACCINE PRODUCTS (medically significant), outcome "unknown"; POST-ACUTE COVID-19 SYNDROME (non-serious), outcome "not recovered", described as "may have "long- covid""; MIGRAINE (non-serious), outcome "not recovered", described as "migraines"; HYPOSMIA (non-serious), outcome "not recovered", described as "diminished smell continues"; FATIGUE (non-serious), outcome "not recovered"; NAUSEA (non-serious), outcome "not recovered"; ARTHRALGIA (non-serious), outcome "not recovered", described as "joint pains"; BURNING SENSATION (non-serious), outcome "not recovered", described as "burning sensation legs/arms"; MYALGIA (non-serious), outcome "not recovered", described as "muscle pains"; DIZZINESS (non-serious), outcome "not recovered"; VISION BLURRED (non-serious), outcome "not recovered", described as "blurry vision"; DECREASED APPETITE (non-serious), outcome "not recovered", described as "loss of appetite"; MENSTRUATION IRREGULAR (non-serious), MENSTRUATION DELAYED (non-serious), outcome "not recovered" and all described as "menstrual irregularities- delay/ early". The events "fainted in shower", "may have "long- covid"", "migraines", "diminished smell continues", "fatigue", "nausea", "joint pains", "burning sensation legs/arms", "muscle pains", "dizziness", "blurry vision", "loss of appetite" and "menstrual irregularities- delay/ early" required physician office visit. The patient underwent the following laboratory tests and procedures: SARS-CoV-2 test: Positive, notes: If covid tested post vaccination: Yes. It was unknown if therapeutic measures were taken as a result of syncope, post-acute covid-19 syndrome, migraine, hyposmia, fatigue, nausea, arthralgia, burning sensation, myalgia, dizziness, vision blurred, decreased appetite, menstruation irregular, menstruation delayed. Clinical course: Reported on 04Jun2023 that second covid booster (4th covid vaccine dose) was Pfizer's. All other doses (3) were Moderna. The patient got Covid in early Apr2023. Nowfelt they may have "long- covid" as they are experiencing migraines, diminished smell continues, fatigue, nausea, joint pains, burning sensation legs/arms, muscle pains, dizziness/blurry vision, fainted in shower, loss of appetite, menstrual irregularities- delay/ early - indicates these irregularities happened after receiving each vaccine and was occurring now. The patient seek medical care by primary physician.  No follow-up attempts are possible. No further information is expected.