PASSING OUT/ TRYING TO WAKE HER UP; FACIAL CONCUSSION; PURPLE BRUISE ON THE FOREHEAD; MEMORY LOSS; FELL AND HIT MY FACE; SEIZURES; CHILLS; SYNCOPE (SUDDEN LOSS OF BLOOD PRESSURE); SWEATING; DIZZINESS; This spontaneous report received from a patient via a company representative concerned a 29 year old female. The patient's height, and weight were not reported. The patient's concurrent conditions included: cigarette smoker (about 3 cigarettes per day), and non-alcohol consumer, and other pre-existing medical conditions included: The patient had no known allergies and had no history of drug abuse or illicit drug use. The patient had no medical history prior to vaccination. The patient received covid-19 vaccine ad26.cov2.s (suspension for injection, route of admin not reported, batch number: 1808986 expiry: UNKNOWN) dose was not reported, 1 total administered to right arm on 21-JUN-2021 for prophylactic vaccination. Age at time of vaccination 29 years old. No concomitant medications were reported. On 23-JUN-2021, two days after receiving the vaccine, the patient started with sweating and chills, followed by dizziness, sweating and needed to sit down and relax.  After one month, the patient started having chills and sweating again, stood up and was on the floor, her daughter tried to wake her up. The patient did not report it to her pharmacy and thought it will go away but it got worse.  Later the patient had another episode, when sleeping and as was getting up from the bed and trying to stand up and fell down on the floor and felt dizzy and started having seizure and twitching in her hands and legs were stretching. The ambulance was called and the patient woke up by then and went to the hospital by herself on 22-SEP-2021 to the emergency. The patient said it is because of the COVID19 vaccine but the emergency diagnosed with syncope (sudden loss of blood pressure). The mentioned fall caused her to have a facial concussion, and purple bruise on the forehead. The patient got nausea medications and started vomiting after she woke up from seizure. Since she got the vaccine, she had about twenty seizures, and it kept happening, in one day she might get three seizures. The patient thought it is causing memory loss and she cannot remember simple stuff. On 14-JAN-2022, Laboratory data included: Magnetic resonance imaging (NR: not provided) Unknown. On 07-APR-2022, the patient was outside and had a seizure and fell and hit her face on the floor and she got rushed to the hospital and got MRI (Magnetic Resonance Imaging) on her face resulted unknown. On 08-APR-2022, Laboratory data included: Laboratory test (NR: not provided) Unknown. Laboratory data (dates unspecified) included: Blood pressure (NR: not provided) Unknown. The action taken with covid-19 vaccine ad26.cov2.s was not applicable. The patient had not recovered from syncope (sudden loss of blood pressure), seizures, chills, sweating, dizziness, passing out/ trying to wake her up, and memory loss, and the outcome of fell and hit my face, facial concussion and purple bruise on the forehead was not reported. This report was serious (Other Medically Important Condition).; Sender's Comments: V0 : 20220429250-covid-19 vaccine ad26.cov2.s -seizures, passing out/ trying to wake her up, syncope (sudden loss of blood pressure). The event(s) has a compatible/suggestive temporal relationship, is unlabeled, and has unknown scientific plausibility. There is no information on any other factors potentially associated with the event(s). Therefore, this event(s) is considered unassessable.