Fatigue; Exhaustion; Headache; lost 40 lb; out of work; Dizziness; aches and pains; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient. Other Case identifier(s): US-PFIZER INC-202101885492 (Pfizer).  A 66 year-old male patient received bnt162b2 (BNT162B2), administration date 16Apr2021 (Batch/Lot number: unknown) at the age of 66 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "cancer" (unspecified if ongoing). There were no concomitant medications. The following information was reported: FATIGUE (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "Fatigue"; FATIGUE (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "Exhaustion"; HEADACHE (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "Headache"; WEIGHT DECREASED (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "lost 40 lb"; LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "out of work"; DIZZINESS (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "Dizziness"; PAIN (non-serious) with onset 18Apr2021 17:00, outcome "not recovered", described as "aches and pains". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Patient got the first Pfizer Covid shot in April. He thinks he got it on 18Apr2021, no longer has card. He has been out of work since the first shot. He has been to every doctor since, and mentions that he has lost 40 pounds, having a hard time eating, he can't think for his self. He states that it has been 8 months since 18Apr2021, could not find his vaccination card and might have left it at the doctor. He started developing symptoms at 5PM the night of the shot about 8-9 hours later receiving the vaccine like fatigue, exhaustion, dizzy, headache, and these aches and pains, got worse every day after this shot. Events Fatigue, Exhaustion, Headache, Dizziness, Aches and pains were reported as worsened. He was supposed to go back to work that day, needs to get money, and feels like he is going to lose everything. Patient received his first dose of Pfizer Covid vaccine on or around 16Apr2021 between 7:30 and 8:00 am and then went to work. Around 5:00pm he called his son and asked to take him home. He went to see his doctor two and a half weeks later as he was not getting better. He had lost 32 pounds since his last visit to doctor. His doctor suspected he had cancer due to his rapid weight loss. When doctor questioned him about his weight loss he told him that he did not have an appetite and had to force himself to eat. All types of tests for cancers has been conducted and there were no abnormalities. Then doctor thought it might be neurological so he advised a CAT scan and it was normal. Then patient went to see a specialist who gave him an MRI which is normal. He says that no one doctor has admitted that symptoms might be related to the vaccine, but he was healthy, worked a 40-50 hour work week, took care of his elderly mother and took care of his home until he received his vaccine.   No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.