I started to feel nauseous out of no where; I started to feel nauseous out of no where, I would wake up out of a dead sleep because it got so bad at times; Then the abdominal pain started/ Well after my cycle ended I was still in pain and it actually got worse; I got the initial sickness about 4 hours after the booster; Just like a cold; Lymph nodes swollen in my pelvic area; This is a spontaneous report from a contactable reporter (other healthcare professional). The reporter is the patient.  A 24-year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in right arm, administration date 26Jan2022 at 16:00 (Lot number: FJ5683) at the age of 24 years as dose 3 (booster), single for COVID-19 immunisation. Relevant medical history included: "Hypothyroidism" (unspecified if ongoing) and "Allergy to chemicals" (unspecified if ongoing), notes: Known allergies: Febreeze. Concomitant medication included: LEVOTHYROXINE. Vaccination history included: Covid-19 moderna vaccine (DOSE NUMBER UNKNOWN, SINGLE; Lot number: UNKNOWN), for COVID-19 immunisation, reaction: "Allergic reaction" and Covid-19 vaccine (DOSE NUMBER UNKNOWN; MANUFACTURER UNKNOWN), for COVID-19 immunisation.  The following information was reported: ILLNESS (non-serious) with onset 26Jan2022, outcome "recovering", described as "I got the initial sickness about 4 hours after the booster"; NASOPHARYNGITIS (non-serious) with onset 26Jan2022, outcome "recovering", described as "Just like a cold"; NAUSEA (non-serious) with onset 09Feb2022 at 20:00, outcome "recovering", described as "I started to feel nauseous out of no where"; SLEEP DISORDER (non-serious) with onset 09Feb2022 at 20:00, outcome "recovering", described as "I started to feel nauseous out of no where, I would wake up out of a dead sleep because it got so bad at times"; ABDOMINAL PAIN (non-serious) with onset 09Feb2022 at 20:00, outcome "recovering", described as "Then the abdominal pain started/ Well after my cycle ended I was still in pain and it actually got worse"; LYMPHADENOPATHY (non-serious) with onset an unknown date in 2022, outcome "recovering", described as "Lymph nodes swollen in my pelvic area". The events "I got the initial sickness about 4 hours after the booster", "Just like a cold", "I started to feel nauseous out of no where", "I started to feel nauseous out of no where, I would wake up out of a dead sleep because it got so bad at times", "Then the abdominal pain started/ Well after my cycle ended I was still in pain and it actually got worse" and "Lymph nodes swollen in my pelvic area" were evaluated at the physician office visit and emergency room visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of illness, nasopharyngitis, nausea, sleep disorder, abdominal pain and lymphadenopathy.  Additional information: The patient did not receive any other vaccines within four weeks prior to the COVID vaccine. Prior to vaccination, the patient was not diagnosed with COVID-19. It was reported that the patient waited to do anything about it because she was thinking it was related to her monthly period. Well after her cycle ended the patient was still in pain and it actually got worse. So, on 15Feb2022 she was told by her doctor the best bet was to go to the emergency room (ER). While she was there, they did blood work, urine analysis (U/A), Ultrasound and Computed tomography (CT). That was when the physician assistant (PA) said she had Lymph nodes swollen in her pelvic area acting as appendicitis and was more than likely she got it from the Booster since the patient had not been sick for months besides when she got the booster. Since the vaccination, the patient had not been tested for COVID-19.