Diarrhea; Head hurts; Left arm itched terribly where it is real red at; Left arm itched terribly where it is real red at; Her left arm swelled up so bad; Achy all over; Every time she eats, she had to go to the bathroom; This is a spontaneous report from a contactable consumer (patient reporting for herself). This consumer reported events for the second and third doses of the Pfizer vaccine. This is the first of the two reports, describing the events for the third dose.  A 78-year-old female patient received the third dose of bnt162b2 (COMIRNATY), via an unspecified route of administration, administered in the left arm (reported as "injected in left arm and was in the shoulder part in the muscle") on 23Oct2021 10:00 (batch/lot number: EW0168) at the age of 78 years old, as DOSE 3 (BOOSTER), SINGLE for COVID-19 immunization. The patient's medical history included Grave's disease which she thinks she has had for years. She does not remember diagnosis date. Patient reported that before the vaccination, her weight was between 157-158.  She had lost 17 lbs and was starting to gain some back. Patient was allergic to antihistamines; she did not have a manufacturer, lot or expiration for the antihistamine she was allergic to. Patient was allergic to red, orange, and pink dye in any medication. She went to an allergy doctor and he could not give her the medications she was allergic to, just a list of things. He said she was allergic to Latex, Tape, betadine, Penicillin, Reglan, Tramadol, Phenylephrine Topical, Metoclopramide, Low dose aspirin, Azithromycin, Toradol, Oxycodone/Acetaminophen. She can take Tylenol, but it raises her blood pressure. She does not take it and does not have information on the manufacturer, lot or expiration for any of the medications she is allergic to. She does not know the dates she was diagnosed. Patient had no family medical history relevant to reported adverse events. Concomitant medications included unspecified products which she takes early morning. She stated that she was not on anything that would interfere. She did not have any different medication with this one than the other two. They did not interfere with the other two. No further details were provided. There were no prior vaccinations within four weeks and no additional vaccines administered on same date of the Pfizer vaccine. The patient previously took the first dose of BNT162B2 injected in left arm and was in the shoulder part in the muscle on 04Mar2021 (batch/lot number: NW6200) at the age of 77 years old, as DOSE 1, SINGLE for COVID-19 immunization. The patient also took the second dose of BNT162B2 injected in left arm and was in the shoulder part in the muscle on 07Apr2021 (batch/lot number: NW6208) at the age of 78 years old, as DOSE 2, SINGLE for COVID-19 immunization and experienced vaccination site pruritus and vaccination site reaction described as "the second vaccination itched and had a mark like a half dollar." The patient had the booster on Saturday, 23Oct2021. Her left arm swelled up so bad. When she woke up Sunday morning (24Oct2021), it was really bad. It was still swollen, but not as bad as it was. The swelling improved yesterday (27Oct2021) after she put Ice pack on it. On 23Oct2021 15:00, patient's left arm itched terribly where it was real red. The second vaccination itched and had a mark like a half dollar, and it did not itch like the third one did and that was why she did not report it.  She took a picture of the arm if there is a way to send them.  It was still red and itching, but not as bad. It was just terrible for 3 days. It was also reported that the patient head hurts on 23Oct2021 16:00; was achy all over on 23Oct2021 (Saturday night); and had diarrhea on 24Oct2021 09:00 (after breakfast). Every time she eats, she had to go to the bathroom since Oct 2021 and that was not normal. The events did not require visit to the Emergency Room and Physician Office. She tried to reach her medical doctor, but he was booked up.  A friend of hers is an NP and she talked to her. She told her that she was allergic to antihistamines and she told her to try a Benadryl, so she took one. Her itching was not as bad as it was the days before. No relevant tests were taken for the events. Patient reported that she has blood tests every 3 months and will not have another until 3 months. The patient has not recovered from the events left arm itched terribly where it is real red at (vaccination site pruritus) and left arm itched terribly where it is real red at (vaccination site erythema); was recovering from the events left arm swelled up so bad (vaccination site swelling). Outcome of the other events was unknown.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202101473269 same reporter/ patient/vaccine; different dose/ different events