First early signs that cancer has metastasized to the brain?

Variable: Signs of cancer that has metastasized (spread) to the brain can include headaches, nausea, vomiting, changes in thinking or memory, seizures, visual changes or stroke-like symptoms. There are other things that can cause these symptoms and sometimes there are no symptoms.

Expect visual.: The early signs can be visual, with painless visual loss to blindness, diploplia (double vision), and nystagmus depending on where the tumor/metastases is in the brain. These can happen in days to weeks to months. Other signs are also noted, like agitation, memory loss, dysarthria, and cerebellar ataxia, depending on the site in the brain.

You can have it and: Know nothing; but head ache, seizure, weakness on one side or the other, personality change, sleepiness are some common symptoms. An brain MRI is more sensitive than a ct, either with contrast, a non contrast scan may pick up mets that have hemorrhaged or a large enough to compress ventricles or shift the midline.