Overseas health insurance customers should visit their GP if they are concerned about memory loss.
Alison Cranage, spokeswoman for Alzheimer's Research UK, said that it is important to talk to a health profession and "get the right diagnosis" because memory loss itself can prompt further mental worries, such as stress and depression.
The comments follow research from the Alzheimer's Society, which found that over half a million people are expected to be living with dementia that is undiagnosed by 2021.
Ms Cranage added that the causes of Alzheimer's and other types of dementia are "complex".
"It's becoming clear that they don’t have one single cause," she explained.
"It is likely that a mixture of our age, genes, environment and lifestyle contribute to whether we develop dementia."
Overseas medical insurance can help to balance the cost of good mental healthcare, ensuring that you have access to good quality treatment should you need it.