She doesn't know what she weighs, it is going down so fast; She has a urine problem and urinates often; Don't have any appetite now/lost her appetite, even for water; Loose bowels; Voice is so dry/voice had also been affected; having a sleep problem, sleeping has been very bad; This is a spontaneous report from a contactable consumer (the patient). A 90-year-old female patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Lot Number: EN6199) via an unspecified route of administration on 10Mar2021 at age of 90-year-old at single dose for COVID-19 immunisation. Medical history included the patient had cancer about 10 years ago, it went away and then it came back. Caller reported that it started showing up on her mammogram again. Concomitant medication included anastrozole taken for neoplasm malignant from 10Jan2021. Caller reported side effects from the Pfizer COVID vaccine. Caller stated that she didn't know if it was the vaccine or because of the cancer she has, but she didn't have any appetite now (onset date 24Mar2021). She was eating all right and taking the cancer drug, but on 24Mar2021 (reported as "about 2 weeks after the Pfizer COVID vaccine on 10Mar2021"), she lost her appetite, even for water. Caller reported that she could go two days without eating anything. At the same time she was having loose bowels. She didn't know if the loose bowels was from the medicine she was taking or something else. Her voice had also been affected, it was so dry, she couldn't even talk. The caller also reported that that she didn't know what she weighs, it was going down so fast because she was not eating since an unspecified date. Caller not sure about weight. Caller stated that she was having a sleep problem, sleeping has been very bad. Everything started about 2 weeks after she got the first Pfizer COVID vaccine on the 10Mar2021. Caller was supposed to go back for her second Pfizer COVID vaccine on the 31Mar2021, but on the 24Mar2021 she started having trouble with eating and sleep and loose bowels. Since symptoms started after her Pfizer COVID vaccine dose on 10Mar2021, she decided not to go back on 31Mar2021 for the second dose. Caller reported that she ate 2 French fries since 07Apr2021 (yesterday), from a sandwich she ordered yesterday but didn't eat the sandwich. Caller clarified that she couldn't even eat the 2 French fries and hasn't had anything since then. For loose bowels: caller reported that she had a urine problem and urinates often since an unspecified date. Caller stated that when she went to urinate and when she barely presses down, she would have a bowel movement, but it was very watery and loose, not a formed bowel movement. She talked to her cancer doctor and her regular doctor who both told her to go to the hospital but she did not go. For dry voice: caller reported that she didn't know if it was acid coming up in her mouth or just dry mouth. Caller didn't know what it was, if she kept her mouth closed and didn't talk and didn't get any air, it was not as bad. Caller reported that trying to talk was bad and it had recently gotten a little worse. The patient wasn't having these symptoms before she took the vaccine. The outcome of "she doesn't know what she weighs, it is going down so fast" and "she has a urine problem and urinates often" was unknown, the outcome of other events was not recovered.  No follow-up attempts are possible; information about lot/batch number cannot be obtained.