'down appetite' and 'as if it is not existed during the day'. Caller also mentioned that he is not hungry and feel full all day; 'down appetite' and 'as if it is not existed during the day'. Caller also mentioned that he is not hungry and feel full all day; Caller also mentioned that this made him "productive and gives him tons of energy"; Caller also stated that he 'noticed to be wired and focused; full of focus throughout the day'. Caller also mentioned that this made him "productive and gives him tons of energy"; felt muscle cramps on his legs and arms; bad diarrhea; he felt chest pain on his left side and that lasted until the next morning. Caller mentioned that his left chest was also sore.; 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 38 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 22Feb2022 (Lot number: FK9895) at the age of 38 years as dose 1 (tris), 0.3 ml, single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications.  The following information was reported: DECREASED APPETITE (non-serious), ABDOMINAL DISTENSION (non-serious), outcome "unknown" and all described as "'down appetite' and 'as if it is not existed during the day'. Caller also mentioned that he is not hungry and feel full all day"; ENERGY INCREASED (non-serious), outcome "unknown", described as "Caller also mentioned that this made him "productive and gives him tons of energy""; THERAPEUTIC RESPONSE UNEXPECTED (non-serious), outcome "unknown", described as "Caller also stated that he 'noticed to be wired and focused; full of focus throughout the day'. Caller also mentioned that this made him "productive and gives him tons of energy""; DIARRHOEA (non-serious) with onset 23Feb2022, outcome "recovered" (23Feb2022), described as "bad diarrhea"; MUSCLE SPASMS (non-serious) with onset 24Feb2022, outcome "recovered" (24Feb2022), described as "felt muscle cramps on his legs and arms"; CHEST PAIN (non-serious) with onset Feb2022, outcome "recovered" (Feb2022), described as "he felt chest pain on his left side and that lasted until the next morning. Caller mentioned that his left chest was also sore.".  Additional information: patient stated that he has a 'down appetite' and 'as if it is not existed during the day'. Caller also mentioned that he is not hungry and feel full all day. Caller also stated that he 'noticed to be wired and focused; full of focus throughout the day'. Caller also mentioned that this made him "productive and gives him tons of energy". Caller is also reporting "negative side effects" that he felt right after being vaccinated. Caller stated that he had "bad diarrhea" and felt muscle cramps on his legs and arms that lasted for 1-2 seconds. Caller also mentioned that the night he received the dose, he felt chest pain on his left side and that lasted until the next morning. Caller mentioned that his left chest was also sore. Patient said that his appetite has been completely down, non existent during the day. He is not hungry. He has no cravings for junk food. He stated that he feels full all day long. He also noticed he had really good sleep, he feels very rested in the morning and it is easy for him to fall asleep. He said that this started the next day after the vaccine. He has been wired and going 100mph. He looked online and has not found anything about his symptoms or if this has been reported. He said that it has been a incredible experience and had been life changing and wonderful. He said that he is hoping he is not going to have a heart attack. He said that he feels like he is on like a serious amphetamine or something, or whatever would make him wired and hyper. He said that he has not received his second dose yet. His second dose is due in Mar2022. Caller clarified that it was the Pfizer Covid-19 Vaccine gray cap. He said that the only bad thing he noticed was left chest pain that night and the next morning. He does not know if it was from tensing up because he does not like needles. He said that his left chest was sore. The next day had very bad diarrhea one time. He would get a quivering muscle cramps in his leg and arms that would last 1-2 seconds that was like a (withheld) horse.  He said that he has not noticed it since the latter part of yesterday.  No follow-up attempts are possible. No further information is expected.