pain below waist on right side; Nauseated after she ate; She was not feeling well; The other night when she was sick, her head felt really hot so she thinks she had a temperature that night, but is not sure; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 82 year-old female patient received bnt162b2 (BNT162B2), administered in arm, administration date 08Mar2021 13:00 (Lot number: EN6206, Expiration Date: 30Jun2021) at the age of 82 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Celiac" (ongoing), notes: Verbatim: Celiac; "Non ischemic tachyarrhythmia dilated cardiomyopathy", start date: 1999 (ongoing), notes: Verbatim: Non ischemic tachyarrhythmia dilated cardiomyopathy; "Lower back" (ongoing), notes: Verbatim: Lower back; "Hypothyroidism" (ongoing), notes: Verbatim: Hypothyroidism; "heart problem/to regulate her heart" (unspecified if ongoing), notes: Verbatim: She has a heart problem.; "surgery" (unspecified if ongoing), notes: Verbatim: She broke wrist and has carpal tunnel; she had surgery in Oct/Nov2020.; "balances the system, low on thyroid" (unspecified if ongoing); "balances the system, low on thyroid" (unspecified if ongoing). Concomitant medication(s) included: ATORVASTATIN taken for myocardial infarction (ongoing); LEVOTHYROXINE taken for balance disorder, thyroid disorder (ongoing); SPIRONOLACTONE taken for cardiac disorder, start date: 1999 (ongoing); LISINOPRIL (ongoing); CARVEDILOL taken for cardiac disorder (ongoing); ESCITALOPRAM (ongoing). The following information was reported: FEELING HOT (non-serious) with onset 08Mar2021, outcome "unknown", described as "The other night when she was sick, her head felt really hot so she thinks she had a temperature that night, but is not sure"; PAIN (non-serious), outcome "not recovered", described as "pain below waist on right side"; NAUSEA (non-serious), outcome "recovering", described as "Nauseated after she ate"; FEELING ABNORMAL (non-serious), outcome "unknown", described as "She was not feeling well". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of pain, nausea, feeling abnormal.  Additional information- The caller received the vaccine on Monday, 08Mar2021 and she was having pain below her waist and wanted to know if that is normal with the vaccine. She stated it seems like it was where her kidneys are and was wondering what was going on talked to someone who said that can happen. She asked if drinking water would help it. She was experiencing a side effect that she was curious about. She was having back pain below her waist- thinks where kidneys are. she clarified the pain was on the right side. It was tight. she reported it was very hard to move; when she was in the car it hurts to close the door. She talked to someone that said it was part of the side effects. No additional information provided. She was alright when she got the shot, but when she got home, she had not had lunch so she was eating snacks. She reported that she had peanuts and thinks it could have gluten. She had celiac so she started feeling nauseated. She does not know if this is from the shot because she started feeling nauseated right after she ate. She is not feeling as nauseated anymore. Caller reports she fixed dinner that night, but she felt awful so she put it away and went to bed. Caller reported that yesterday the pain got worse, even though she thought it would get better. She was not feeling well the first night. Treatment- She thought it was from the celiac and not the vaccine. Caller states she got up and took a Tylenol and slept kind of late. She felt better when resting. She was taking Pepto-Bismol for the nausea. If she was not doing much, she does not noticed it. however, she had to run errands, she could not got the car door closed and it was hard to walk. Caller stated she had a heart problem.   No follow-up attempts are possible. No further information is expected.