feels discomfort; tired; achy; noticed the second dose seemed to have been administered in the middle of her arm; noticed the second dose seemed to have been administered in the middle of her arm; arm was "way more sore than the first time".; 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 71 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm right, administration date 16Mar2021 (Lot number: EN6206) at the age of 71 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "blood pressure high" (unspecified if ongoing); "High cholesterol" (unspecified if ongoing); "Afib" (unspecified if ongoing); "surgical procedure that made it stop" (unspecified if ongoing). Concomitant medication(s) included: ELIQUIS taken for atrial fibrillation; LIPITOR ORIFARM taken for blood cholesterol increased; SYNTHROID. Vaccination history included: Bnt162b2 (Dose 1, Single, Anatomical location: Arm Right, Batch no: EN6198), administration date: 23Feb2021, for Covid-19 immunisation, reaction(s): "soreness in her arm", "tired", "achy", "Achylia gastrica". The following information was reported: PAIN IN EXTREMITY (non-serious) with onset 16Mar2021, outcome "not recovered", described as "arm was "way more sore than the first time"."; DISCOMFORT (non-serious), outcome "unknown", described as "feels discomfort"; FATIGUE (non-serious), outcome "unknown", described as "tired"; PAIN (non-serious), outcome "unknown", described as "achy"; WRONG TECHNIQUE IN PRODUCT USAGE PROCESS (non-serious), PRODUCT ADMINISTERED AT INAPPROPRIATE SITE (non-serious) all with onset 16Mar2021, outcome "unknown" and all described as "noticed the second dose seemed to have been administered in the middle of her arm". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: The patient received the second dose of the Pfizer-BioNTech COVID-19 vaccine a month ago, and experienced "mild reactions to both injections" such as : being "tired and achy. Patient said after the second vaccine, however, her arm was "way more sore than the first time". She explained after a day or two it got better, but her arm never "got ok". She specified it is "70% better". The patient's arm pain improved 60-70% within 2-3 days but it has never improved to fully back to normal. The pain was the same arm as the patient received the vaccine. She explained her arm still has a "little soreness, but it's "not debilitating", she felt discomfort when rolling/laying on it in bed, when she uses, or when she lifts it. When the patient had the second vaccine she felt that the person administering it had gone into the middle of the arm not really in the deltoid, a couple of inches below where she received her first dose. Patient asked would the vaccine be as equally effective if the second dose was administered lower in the arm. She expressed her concerns on not being protected from the vaccine due to this potential inadvertent administration of the vaccine.   No follow-up attempts are possible. No further information is expected.