Virginia Tech Oct 13 2025 Cancer is a challenging enough diagnosis, but many patients are dealt a second blow, even as they heal: "chemo brain." Also called "brain fog," this mix of cognitive issues - memory problems, struggling to find words, an inability to concentrate - affects up to three-in-four cancer patients, according to multiple studies. For many, the effects last years beyond cancer treatment. A new study offers new models for studying causes of chemo brain and points to the effects