Gums in her mouth were swollen and tender; Soreness in the arm in the injection site; Tension and stiffness going up from the injection site from her shoulder and neck to the base at the back of her head; Tension and stiffness going up from the injection site from her shoulder and neck to the base at the back of her head; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 38 year-old female patient received bnt162b2 (BNT162B2), administered in arm right, administration date 21Apr2021 (Lot number: ER8734) at the age of 38 years as dose 1, single for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. The following information was reported: INJECTION SITE PAIN (non-serious) with onset 21Apr2021, outcome "not recovered", described as "Soreness in the arm in the injection site"; TENSION (non-serious), MUSCULOSKELETAL STIFFNESS (non-serious) all with onset 21Apr2021, outcome "recovered" (21Apr2021) and all described as "Tension and stiffness going up from the injection site from her shoulder and neck to the base at the back of her head"; GINGIVAL SWELLING (non-serious) with onset 22Apr2021, outcome "recovering", described as "Gums in her mouth were swollen and tender". Therapeutic measures were not taken as a result of injection site pain, tension, musculoskeletal stiffness, gingival swelling.  Additional information: The patient was taking Pfizer Covid Vaccine because she felt the benefits of the vaccine outweighed the potential risks. No investigation assessment. The patient just wanted to report some of the side effects she's been experiencing after having the Pfizer Covid Vaccine. They had all been mild. She had the initial injection done at approximately 1445 yesterday afternoon. It has been almost 24 hours but not quite. She experienced soreness in the arm in the injection site. It was nothing terrible, probably a 2 or 3 on the pain scale. She also noticed last evening some tension and stiffness going up from the injection site from her shoulder and neck to the base at the back of her head. It was temporary for a short time and went away. The other symptom she noticed which was a little unusual was she woke up this morning and noticed her gums in her mouth were swollen and tender to the touch. It is very mild and has decreased as she has been up since she woke up this morning. It is a little unusual, but she knows there are glands under the jaw which could explain it, she could have a potential autoimmune reaction. She worked in home health for 3 years in the office, not as an actual medical provider. While it is not quite the same thing, her mother is an occupational therapist and when she was young her mother was going through school, and she learned a lot through her. She also worked at an attorney's office for 3 years and her primary responsibility was going through medical records of clients. She declines to provide an email address. She honestly does not know her weight. She estimates around 150. She declined to provide a primary physician. The soreness in her arm started yesterday and it was mild. Within an hour of the injection, she noticed it. She had received tips from friends and family who have received it, and they said arm movement would reduce the amount of soreness over 24 hours. She was moving her arm regularly yesterday. The soreness was at its peak when she first woke up this morning. It is only when she extends her arm out and to the side and up and away from her body. It does not hurt moving it forward or back as much. It is primarily in her upper arm region, probably within 2 to 3 inches above and below the injection site. It is mainly muscle soreness. It is worse than it was yesterday. She did also want to say since she woke up this morning is has not been worse but steady since this morning. The tension and stiffness started approximately 3 hours after the injection. It was very mild, and it didn't last the entire evening. She only noticed it for 2 hours. She could feel it creeping up her shoulder to her neck and the back of the base of her skull. It went away. The tenderness and swelling in her gums has decreased since she has been up and ambulatory. It is still tender but not as much as when she woke up. It did not prevent her from eating or drinking. She has not received any treatment; she has not even taken anything over the counter. Indication for Pfizer Covid Vaccine, she felt the benefits of the vaccine outweighed the potential risks in the emergency use vaccine. She also took it to prevent herself from contracting Covid-19 and to stop the spread to others. She is taking no medications that would be relevant. Any medication she was taking she has been on regularly, so nothing would have caused anything new. No additional vaccines administered on same date of the pfizer suspect. The AE did not result in emergency room or physician office visit. She did not even treat herself with over-the-counter medications. The most severe symptom is the arm pain and that is only when it is out and to the side. At a maximum it is a 3 on the pain scale. The patient did not receive any other vaccine in four weeks. No AE(s) following prior vaccinations. No family medical history relevant to ae(s). No relevant tests.  No follow-up attempts are possible. No further information is expected.