The global population with dementia is rapidly increasing around the world.The major risk factor for dementia is aging. There is currently no treatmentavailable and the cost of symptomatic treatment is high. There is a growinginterest in possible clinical applications of non-invasive methods that are safeand easy-to-perform in diagnosis of dementia. The purpose of this paper is toinvestigate the usage of transcranial magnetic stimulation (TMS) withelectroencephalography (EEG) to diagnose dementia in early stages of thedisease. Early diagnosis is needed to reduce the costs of symptomatic care.When investigating the usage of TMS-EEG technology, we will look at how wecan distinguish dementia in different neurodegenerative diseases between eachother. More research is needed to suggest an accurate parameters fordiagnosis of dementia with this type of technology.