doesn't know if it is lymph nodes swelling or if it is something; pain was really bad and she couldn't lift her head up; diarrhea that lasted a few days; upset stomach; persistent pain in neck, upper back area; persistent pain in neck, upper back area; muscle pain on her shoulder; This is a spontaneous report from a contactable consumer. Follow-up #01 (PRD/SRD 13Apr2021) received from a contactable consumer was processed together with initial information.  This is a spontaneous report from a contactable consumer (patient). A 34-years-old female patient received first dose of bnt162b2 (BNT162B2, Formulation: solution for injection, Lot Number: ER8737) via an unspecified route of administration in right arm on 07Apr2021 (at 12:30 or 1:00pm) as single dose, 0.3 ML, for COVID-19 immunization. The patient's medical history and concomitant medications were not reported. The patient had no prior vaccinations within 4 weeks. On 08Apr2021, patient experienced persistent pain in neck, upper back area. On 09Apr2021, diarrhea that lasted a few days and upset stomach. On an unspecified date, patient mentioned that in the morning its worse, and it took her 20 mins to get out of bed, she didn't know if it was lymph nodes swelling or if it was something else. Patient believed that she was having a side effect from dose number one. She has had a persistent pain in her neck/upper back area from the morning after she got the vaccine. She never had neck pain before, so she had been watching it. She said it hurt pretty bad and it's gotten worse. It was moderate to severe. She was waiting for her doctor to call her back. Patient mentioned that in the information she was given, this side effect wasn't stated so she was wondering if it was normal or what she should do. Patient also reported that she had read a bunch of threads online about people reporting neck pain after the Pfizer vaccine and some had mentioned lymph node swelling. The patient also reported that on 07Apr2021, with her first COVID 19 vaccine she had this muscle pain on her shoulder, back and neck area on the side where she got the COVID 19 vaccine. It began like a day after she received the COVID 19 vaccine. The pain kept getting worse and by day 7 or 8, after the vaccine, the pain was really bad, and she couldn't lift her head up when she would wake up in the morning. She tried to contact her primary care doctor but didn't hear back from that office. Her muscle pain finally started to go away. She spoke to someone at Pfizer  about 2 weeks ago who was going over statistics with her from the clinical study that was done. The patient was told that 21 percent of people experienced new or worsened muscle pain. Nothing else had changed in any other area of her life or any other activity. The only outlier was the COVID 19 vaccine. That's why she called because it was severe pain. She wanted to go to the emergency department but what was waiting to hear back from her primary care doctor, but that office never got back to her. It was scary, she couldn't lift her head for a few days, and she took Ibuprofen. Now her second COVID 19 vaccine was scheduled in 2 days on 05May2021. She felt very hesitant about getting the second vaccine. She lived alone and she didn't want to go through her muscle pain again. She didn't want her family to have to drive to her house to help her. She was following up with Pfizer to see if there was any guidance on whether someone with her experience should receive her second COVID 19 vaccine. She reported that she called her doctor 2 to 3 times daily for 3 days and never spoke to anyone from that office. By then the weekend was there. On the third day of trying to call her doctor, she left her doctor a crazy voicemail because it was not right that no one was returning her calls and her doctor was unavailable to her. At the time she had a change of work status, so she didn't have health insurance. She had health insurance now and had not seen a new doctor. Her muscle pain was still lingering. She was been trying to do neck exercises and stretches. She was never had pain in that area before. The patient spoke to a girl who worked at the urgent care. This girl who answered the phone at the urgent care told the patient that the same thing happened to her, it was all neck pain. At that point, the patient was aware that what she experienced had happened to someone else. The patient was trying to confirm if her neck pain was related to the vaccine or not but the girl who answered the phone at the urgent care, didn't really say anything else. There was not a product complaint to report. There was a medical information request. Further probing could not be done as consumer hung up the call abruptly. Hence, limited information was available over the call. The outcome of the events was unknown.  No follow-up attempts are needed. No further information is expected.  Follow-up# 1 and 2 (03May2021): This is a follow-up spontaneous report from a contactable consumer. This consumer (patient) reported for herself included that: added new events (muscle pain on her shoulder and pain was really bad and she couldn't lift her head up) treatment information, and clinical information.