possible Rheumatoid Arthritis; have been suffering from new autoimmune diseases; body was in extreme pain and swollen; body was in extreme pain and swollen; elevated numbers of inflammation; have extremely irregular periods; My cycle is now every 2 weeks rather than once a month; This is a spontaneous report received from contactable reporter (Consumer or other non HCP). The reporter is the patient.  A 34-year-old female patient (not pregnant) received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), administration date 04May2021 (Lot number: ew0167) at the age of 34 years as dose 2, single for COVID-19 immunisation. Relevant medical history included: "eczema" (unspecified if ongoing); "hypothyroid" (unspecified if ongoing). Concomitant medication(s) included: TIROSINT. Vaccination history included: BNT162B2 (dose 1, single, Batch/Lot No: ew0153, Hairloss after 1st vaccine), administration date: 13Apr2021, when the patient was 34 years old, for COVID-19 Immunization, reaction(s): "Alopecia Areata". The following information was reported: RHEUMATOID ARTHRITIS (medically significant) with onset May2021, outcome "recovered with sequelae", described as "possible Rheumatoid Arthritis"; AUTOIMMUNE DISORDER (medically significant) with onset May2021, outcome "recovered with sequelae", described as "have been suffering from new autoimmune diseases"; PAIN (non-serious), SWELLING (non-serious) all with onset May2021, outcome "recovered with sequelae" and all described as "body was in extreme pain and swollen"; INFLAMMATION (non-serious) with onset May2021, outcome "recovered with sequelae", described as "elevated numbers of inflammation"; MENSTRUATION IRREGULAR (non-serious) with onset May2021, outcome "recovered with sequelae", described as "have extremely irregular periods"; POLYMENORRHOEA (non-serious) with onset May2021, outcome "recovered with sequelae", described as "My cycle is now every 2 weeks rather than once a month". The events "possible rheumatoid arthritis", "have been suffering from new autoimmune diseases", "body was in extreme pain and swollen", "elevated numbers of inflammation", "have extremely irregular periods" and "my cycle is now every 2 weeks rather than once a month" were evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: scalp biopsy: diagnosed with alopecia areata; lab work: elevated numbers of inflammation, notes: with possible Rheumatoid Arthritis. Clinical course details: Hair loss began 2/3 weeks after first vaccine. Hair loss became extreme and continued to intensifed within months. Patient was diagnosed with Alopecia Areata through a scalp biopsy. Patient lost over half of her hair within months of getting this vaccine. In May2021, patient's body was also in extreme pain and swollen, lab work also found elevated numbers of inflammation with possible Rheumatoid Arthritis. Patient have also continued to have extremely irregular periods since this vaccine. Patient's cycle is now every 2 weeks rather than once a month. Since receiving this vaccine, she have been suffering from new autoimmune diseases she never had before.  Patient has no COVID prior to vaccination and has not been  tested for COVID post vaccination.