It was painful to the point she couldn't put a sheet on her leg; Her leg is still very sensitive; redness and warmth/heat on it/The place is very warm; redness and warmth/heat on it/The place is very warm; it was so tender.; blood clots in left leg; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 74 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 29Oct2021 (Lot number: FIT8028) at the age of 74 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "had varicose veins removed" (unspecified if ongoing), notes: she has had varicose veins removed in the years past; "surgical socks" (unspecified if ongoing), notes: She had surgical socks from the past; "breast cancer" (unspecified if ongoing), notes: she had breast cancer; "COVID pneumonia", start date: Jan2021 (unspecified if ongoing), notes: She had COVID previously in Jan2021; "overweight" (unspecified if ongoing). The patient's concomitant medications were not reported. The following information was reported: THROMBOSIS (medically significant) with onset 01Nov2021, outcome "recovering", described as "blood clots in left leg"; PAIN IN EXTREMITY (non-serious), outcome "unknown", described as "It was painful to the point she couldn't put a sheet on her leg"; PERIPHERAL SENSORY NEUROPATHY (non-serious), outcome "not recovered", described as "Her leg is still very sensitive"; ERYTHEMA (non-serious), FEELING HOT (non-serious), outcome "unknown" and all described as "redness and warmth/heat on it/The place is very warm"; TENDERNESS (non-serious), outcome "unknown", described as "it was so tender.". The patient underwent the following laboratory tests and procedures: sars-cov-2 test: (Sep2021) unknown results. Therapeutic measures were taken as a result of peripheral sensory neuropathy. Clinical course stated by patient as "Three days later blood clots in left leg. She called the doctor because she has had varicose veins removed in the years past. She had surgical socks from the past so she knew to put those on. She wrapped and elevated her legs. She contacted her doctor. She got in touch with him. He did not prescribe anything to her. She just knew what to do. She was supposed to go to (withheld), but detained travels to make sure she was safe to be to travel that length of time in a car. She was just safe the next couple of weeks. She did elevation, walking, and wrapping. It has eventually went away. She was concerned because that was only her first shot. She elected to not have another vaccine. She needs to talk to a vascular doctor before considering to even get any more vaccines. It was painful to the point she couldn't put a sheet on her leg. It was ridiculous. She lives alone too and she is afraid to get the second vaccine living alone.  Her leg is still very sensitive. She even went for a pedicure, and they couldn't even massage her leg because it was so tender. There was originally redness and warmth/heat on it. The place is very warm. At the time they gave the vaccine children vaccines were not available so she is sure she got the adult COVID vaccine. She got the vaccine in her right arm because she had breast cancer, and they removed her lymph nodes in her right arm. So she cannot have anything done in her right arm. She has to get everything in her left.  She had no reaction what so ever it was fine besides the blood clots."  No follow-up attempts are possible. No further information is expected.