Pain in her armpit and shoulder/sore arm pit, left, into the shoulder; Pain in her armpit and shoulder/sore arm pit, left, into the shoulder; Felt like I had a golf ball under my arm; Slight headache; Injection site is tender; Her arm was sore from the injection; lymph nodes can swell after; This is a spontaneous report from a contactable consumer. A 58-year-old female contactable consumer(patient) reported  A 58-years-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/Lot Number: (Vaccine LOT number difficult to read for caller, she verified it must be ER8737, but initially said it looked like an S), via an unspecified route of administration, administered in Left arm on 30Mar2021 14:37 (58-year-old at the time of vaccination) as dose 1, single for covid-19 immunisation. The patient medical history and concomitant medications were not reported. The patient did not take any other vaccines within 4 weeks, prior vaccinations. The Patient immunologist said she could develop something in the next 2 to 10 years, similar to lupus or similar to that. Her dad and sister, both have autoimmune disease. On 03Apr2021, the patient experienced pain in her armpit and shoulder/ sore arm pit, left, into the shoulder. on an unspecified date on 2021, the patient also experienced felt like i had a golf ball under my arm, slight headache, injection site is tender, her arm was sore from the injection, lymph nodes can swell. On 03Apr2021 she woke up in the middle of the night with pain in her armpit and shoulder that is still ongoing. The Reporter stated, she felt like she had a golf ball under my arm. The patient also had a slight headache and took Tylenol for that and that has gotten better. The pain under her arm is still there though and if she don't take Tylenol every 4-6 hours it get pretty bad. She can tolerate it as long as she take Tylenol for it. The patient stated that she had a side effect after the first dose of the vaccine. The reporter stated that She knew there might be some arm pain, but since the 2nd or 3rd night after the vaccine, she started to have pain in her armpit and her shoulder. She added the injection site is tender, but not like it was in initially. She is concerned about going back for the 2nd dose. She understood that lymph nodes can swell after, but will this happen again to her after the 2nd dose. The reporter asked if she should use the same arm or put off the second dose until it feels better. She is concerned about having the same reaction. Should she change arms or wait until the arm heals. The pain started the 2nd or 3rd night, probably the 3rd night after. Her arm was sore from the injection. The reporter didn't know if this was related, but she went through testing last year for autoimmune problems. The results came back inconclusive. Her immunologist said she could develop something in the next 2 to 10 years, similar to lupus or similar to that. Her dad and sister, both have autoimmune disease. The patient noticed the armpit change in the middle of the night and it freaked her out. The reporter added she is a wait and see what's happening kind of girl before she goes to the doctor, but it if was affecting her breathing she would have gone right away. She is taking Tylenol every 4-6 hours. It has helped tremendously. If she doesn't take it in that time, it does hurt. The reporter asking should she get the second dose, in the same arm, or wait on the second dose. She is concerned about having the same reaction. Therapeutic measures taken as a result of events. The outcome of events Pain in her armpit and shoulder/sore arm pit, left, into the shoulder, Felt like I had a golf ball under my arm were not resolved, Slight headache was resolving and other events were unknown.   No follow-up attempts are possible; information about lot/batch number cannot be obtained