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Background: Vitamin B12 deficiency leads to abnormal myelination or demyelination, resulting in sub-acute combined degeneration, peripheral neuropathy, and psychiatric problems, including delusions, hallucinations, cognitive changes, depression, and dementia. Vitamin B12 deficiency also leads to brain shrinkage and neurodegenerative disorders., Case Report: We report the case of a 49-year-old man presenting with new-onset seizures one and a half years following subtotal gastrectomy due to stage IV gastric adenocarcinoma. The patient did not have any history of head injury. Laboratory tests were negative for any metabolic derangements. There were no signs of infection. MRI brain and EEG were normal and there were no changes in medications., Conclusions: In case of unexplained new-onset seizures, patients should be tested for vitamin B12 and folic acid levels and these should be done as part of the initial work-up.