blood clots in arm/Blood Clots in Left Arm; swollen lymph nodes /Swollen Lymph Nodes in Left Arm; nodules were found on her lungs/Nodules in Lungs; arm swelling /Left Arm Swelling; Left Arm Redness; Left Arm Discomfort; Soreness at the Injection Site; This is a spontaneous report from a contactable consumer (Patient's Mother) calling on behalf of daughter. A 50-year-old female patient received 1st dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, batch/lot number and expiration date unknown), via an unspecified route of administration, administered in Arm Left on 05Mar2021 13:30 at age of 50 years old at single dose for covid-19 immunisation. There was no medical history.   There were no concomitant medications. The patient did not have prior vaccinations within 4 weeks. No adverse events following prior vaccinations. There were no additional vaccines administered on same date of the Pfizer suspect. The patient experienced the following after first dose. The patient experienced arm swelling /left arm swelling (hospitalization) on 09Mar2021 with outcome of recovering , blood clots in arm/blood clots in left arm (hospitalization) on 11Mar2021 with outcome of not recovered , swollen lymph nodes /swollen lymph nodes in left arm (hospitalization) on 11Mar2021 with outcome of not recovered , nodules were found on her lungs/nodules in lungs (hospitalization) on 11Mar2021 with outcome of unknown , soreness at the injection site on 05Mar2021 with outcome of not recovered , left arm discomfort on 08Mar2021 with outcome of not recovered , left arm redness on 09Mar2021 with outcome of not recovered.  The patient was hospitalized from 11Mar2021 to 12Mar2021. On 05Mar2021 she began to have arm pain.  48 hours later, patient's arm started really hurting her, something about her arm being sore on the day of injection and reporter said she was going to be sore and when she got back from going away for the weekend, she thought uh oh, there was a problem here, this was not normal, not right. On 10Mar2021, she experienced swells arm swelling and went to urgent care which was diagnosed with swollen lymph nodes and given Cheplex prescription at urgent care. 11Mar2021, daughter was admitted to hospital by her provider. Daughter was found to have blood clots in arm and continued swollen lymph nodes. Daughter was given IV cheplex and Eliquis while in hospital. Daughter will have to be on Eliquis for next 3 months per reporter. The patient had her first vaccine, Pfizer, and became ill with blood clots, swollen lymph nodes, and wound up in the hospital. Reporter stated that she and the patient were worried about her getting the second shot. The patient was on blood thinners and was seeing a pulmonary doctor and hematologist. She didn't know about her getting the second shot and thought this should be reported. The patient was due for the second vaccine next week on 26Mar2021 and she was still sick, should it be postponed or what? The patient went the night before the hospitalization to the Urgent Care and the doctor prescribed Keflex, an antibiotic and saw her primary care doctor the next morning and she put her in the hospital. Reporter stated they were getting nervous and wanted to report for side effects. She stated the patient was home from the hospital but still sick really bad. The patient went to Urgent Care 10Mar2021, saw her primary care 11Mar2021 and was sent to the hospital 11Mar2021. Reporter later clarified that the patient was sent to the Emergency Room and after a few hours, she was sent upstairs to be admitted for a 24 hour hospital stay. The patient received Eliquis; Keflex as treatment. Fluids at the hospital, unknown type. Reporter stated they decided the patient wasn't doing really well and went to the Urgent Care that night and were given Keflex because they felt there was an infection. When they discovered it further that there were blood clots, the patient was told to stay on the antibiotic and given fluids and put on blood thinner, Eliquis, states patient had never been on a blood thinner before. Patient was admitted on 11Mar2021 for 24 hours. Reporter stated that they kept the medicine going and then felt she was stable enough to be discharged the next night at around 18:00 to continue with Keflex antibiotic and Eliquis for 3 months. Reporter stated they were told to contact a hematologist and pulmonary doctor for the nodules in her lungs and to contact her primary doctor if not doing better in one week, but they will probably contact her tomorrow. Reporter clarified that the patient had a chest x-ray a couple of months ago and everything appeared fine, so she thinks that the nodules developed after the vaccine. The patient had a chest x-ray on 11Mar2021 and nodules were found on her lungs, scheduled to follow up with lung doctor. Reporter stated whether they were there before or not was unknown. No follow up X ray yet. Reporter would like to know if daughter should get second dose? Second dose was scheduled 26Mar2021. Adverse events required visit to emergency room: Urgent Care the night before, follow up the next morning with primary doctor, the doctor got her in right away and said she needs to go to the hospital. Yes, patient went through the ER, doctor said that she would be coming and then after there a while, she was admitted to the hospital. Adverse events required visit to physician office. Patient saw the doctor on 11Mar2021 and was sent to the hospital.   Information about lot/batch has been requested.