lot of issue with my left arm you know right at that muscle where it was injected like something is running up and down in my arm and it is very painful and it hurt; muscle pain; tingling travelling to the vein of that arm, can go all the way down to the elbow; twitching and its very painful; This is a spontaneous report received from a contactable reporter(s) (Other HCP). The reporter is the patient.  A 70 year-old female patient received bnt162b2 (BNT162B2), administered in arm, administration date 05Apr2021 (Lot number: ER8732) at the age of 70 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Diabetes mellitus inadequate control" (unspecified if ongoing), notes: Verbatim: Brittle diabetes. Concomitant medication(s) included: TRULICITY taken for diabetes mellitus; ACTOS taken for diabetes mellitus; JARDIANCE taken for diabetes mellitus.  The following information was reported: PAIN IN EXTREMITY (non-serious) with onset 2021, outcome "unknown", described as "lot of issue with my left arm you know right at that muscle where it was injected like something is running up and down in my arm and it is very painful and it hurt"; MYALGIA (non-serious) with onset 2021, outcome "unknown", described as "muscle pain"; PARAESTHESIA (non-serious) with onset 2021, outcome "unknown", described as "tingling travelling to the vein of that arm, can go all the way down to the elbow"; MUSCLE TWITCHING (non-serious) with onset 2021, outcome "unknown", described as "twitching and its very painful". Therapeutic measures were taken as a result of pain in extremity, myalgia, paraesthesia, muscle twitching.  Additional Information: Patient (Retired Nurse) stated, "I need to find out if you guys keep the record of the Pfizer vaccine and the site that was given if it was on my left arm or Right arm because they didn't put it on the card so, let me know what site they vaccinated me and I can't remember." you know at what site they given the vaccination and that I need to know because I am having a lot of issue with my left arm you know right at that muscle where it was injected and I need to know is that is the side effect it's like something is running up and down in my arm and it is very painful and it hurt." I was reading the pamphlet I had read a lot of information but the pamphlet that was given to me was say muscle pain but I don't know when they say the muscle pain if it's at the time or within a given time when I am having the muscle pain and I am having it feels like tingling travelling to the vein of that arm and it can go all the way down to the elbow and it just at that muscle site and I don't remember if that arm was the one where they gave me the Pfizer I don't know, so, I was getting ready to call my doctor to see if he can give me a CT scan (further clarification unknown) or an emergent some scan (Further not clarified) to see what going on with that muscle because it is twitching and its very painful and I don't think I should be experiencing any side effect I mean, I had my last dose for the Pfizer vaccine was in 27Apr2021 and I have not had any side effect. Patient (Retired Nurse) stated, "I took Tylenol Extra strength Tylenol (LOT # AAA041; Expiration date: Oct2022) and no relieve(hence Tylenol captured as suspect) so, I went to my primary physician and I told him that my arm is brothering, he don't know if it from the Pfizer vaccine but he said to take this medicine tizanidine, 2mg tablet po twice daily, I needed I take only tablet at night so, I am confused (Further clarification unknown) any other I take extra strength Tylenol". The patient did not receive any other vaccines within four weeks prior to the vaccination.  No follow-up attempts are possible. No further information is expected.