impacted with fecal matter / Fecal impaction; feelings of heat in the butt area, specifically on the tailbone of his "butt" / Feels like butt is heating up on bottom; numbness / the area also feels numb; feelings of heat in the butt area/ heats up very hot and it hurts; This is a spontaneous report from a contactable consumer (patient). A 81-year-old male patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Lot Number: ER8736; Expiration Date: Jul2021), via an unspecified route of administration, at the age of 81-year-old administered in arm left (reported as left shoulder) on 29Apr2021 11:00 at single dose for covid-19 immunisation. Medical history included ongoing high blood pressure (diagnosed about 20 years prior to this report), ongoing diabetes (diagnosed about 3 years prior to this report). There was no history of all previous immunization with the Pfizer vaccine considered as suspect. Concomitant medications included insulin taken for diabetes from an unspecified start date and ongoing; hydrochlorothiazide, losartan potassium (HYZAAR) taken for high blood pressure from an unspecified start date and ongoing. Prior Vaccinations (within 4 weeks), there was no other vaccinations within four weeks prior to the first administration date of the suspect vaccine. The patient previously received Flu Vaccine and experienced Shoulder pain for 6 months. The patient asking if the side effects he has been experiencing have been reported. The patient received his first dose of the Pfizer BioNTech COVID 19 Vaccine on 29 Apr 2021. A day after, he gradually became impacted with fecal matter on 30Apr2021. He was taken to the emergency room and was given an enema and stool softener. He mentioned that he was still currently having problems using the restroom. The patient added that he also has "feelings of heat in the butt area", specifically on the tailbone of his "butt" in Apr2021. When he starts walking around, it "heats up very hot and it hurts" in Apr2021. The patient also reported numbness in Apr2021. The patient mentioned that because of the side effects he has been experiencing, he was opting not to receive the second dose. He mentioned that he has been doing frequent visits to the doctor because of his MRI (Magnetic resonance imaging) and colonoscopy." The patient stated he had fecal impaction right after the shot on 29 Apr 2021. Stated it was probably a day or so later. He was gradually becoming impacted.  After a week it got so bad he went to the Emergency Room. They gave him an enema and told him to take stool softeners. The patient stated that he still has this problem. He said it feels like his butt was heating up on the bottom, an area about the size of a pie pan, when he was walking around. States that it is the stool building up inside of him and he cannot get it out. Stated the area also feels numb at times. When he walks around a bit it feels like its heating up and started to hurt. He suspected that this was a side effect from the first dose of the vaccine. He stated he was not going to get the second dose. The patient stated he continues to take the stool softeners, Metamucil, and eats a lot of prunes. The event fecal impaction and feels like butt is heating up on bottom required a visit to Emergency Room. The patient stated that if he didn't think it might be required to travel he would not have gotten the vaccine. The patient denied any labs or testing related to these events. The outcome of events impacted with fecal matter / Fecal impaction; feelings of heat in the butt area, specifically on the tailbone of his "butt" / Feels like butt is heating up on bottom was not recovered and others was unknown.