sores in my mouth; severe joint pain; Headache; Fever; Feeling unwell; Dizziness; Weakness; fast heart beat; This is a spontaneous report from a contactable consumer or other non-health care professional (patient). A 70-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot number: EN6201, expiry date: 30Jun2021, Age at vaccination: 70-year-old) via an unspecified route of administration in left arm on 09Feb2021 as DOSE 1, SINGLE for COVID-19 immunization. Medical history included thyroid removed by RA and immune compromised. Concomitant medications included Levothyroxine Sodium taken for Graves' disease. The patient had no history of all previous immunization with the Pfizer vaccine considered as suspect. No additional Vaccines Administered on Same Date of the Pfizer Suspect. No prior Vaccinations (within 4 weeks). On 11Feb2021, the patient had fast heartbeat and on 15Feb2021, patient experienced sores in my mouth, severe joint pain, Headache, Fever, Feeling unwell, Dizziness, Weakness. She reported that 2 weeks after her first dose she experienced really severe side effects. She is experiencing sores in my mouth. She reports that the sores in her mouth have lasted for over a month. Patient received the first dose of the Pfizer Covid-19 vaccine on 09Feb2021. She received the second dose on 02Mar2021. She has sores in her mouth that are like cold sores. They are not painful. She has done saltwater rinses. She had horrible side effects. She noticed these after the first dose. She received the second dose on 02Mar2021. She did not have any pain or soreness.  She contacted Pfizer way before she received the vaccine. She is immune compromised and wanted to make sure it was ok for her to get the vaccine with taking Levothyroxine. She also experienced severe joint pain. She had a headache. This happens when she takes a nap or goes to bed. Typically, she doesn't have headaches. She had a fever that lasted for 3 hours. She felt lousy and went to sleep. The joint pain has been lasting for a couple of weeks. She was feeling unwell. She had a fast heartbeat when she went to sleep. It was off and on. She is unable to answer outcome of evet for fast heartbeat. Fast heartbeat is also a side effect of her thyroid medication when she is off. The thyroid medication is working fine. She was dizzy for a minute and then it went away. She wasn't sure if she wanted to take the second dose, but she did. She has already reported her side effects plus the new side effect she had after the COVID vaccine. Her side effect was regarding oral mouth sores. She has a friend, and he had the same thing with the oral mouth ulcers occur. He had the same side effects and if you know anything about men they don't report, the women do. She has never had oral mouth sores before. Unfortunately, she had to go to urgent care to see about them and she was told that she had oral mouth cancer. She doesn't have that, but this is important because she could have been on something that she didn't need to be on, which she was, she was on antibiotics that she didn't really have to be on. The patient received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot number: EN6198, expiry date: 30Jun2021) via an unspecified route of administration in left arm on 02Mar2021 as DOSE 2, SINGLE for COVID-19 immunization. The outcome of sores in my mouth was not recovered, for event severe joint pain was recovering, for event headache was recovered on 10Mar2021 with duration of 23 days, fever was recovered on 15Feb2021, feeling unwell was recovered on 26Feb2021, fast heartbeat was recovered on 05Mar2021 with duration of 22 days, Dizziness, Weakness was recovered on 19Feb2021 with duration of 4 days.    No follow up attempts are possible. No further information is expected.