Brain atrophy in the elderly to a certain extent, such as total brain atrophy is easy to dementia, memory is also no, after going out there are dangerous, may cause death. Brain atrophy itself is a gradual progressive process and will not lead to sudden death, but long-term brain atrophy will cause poor memory and reaction ability, which will be dangerous after going out. However, if the brain atrophy is particularly severe and combined with other diseases, it may lead to sudden death.