Over recent weeks, speculation has grown about US President Donald Trump’s erratic behaviour during the US-Israel war on Iran.

While questioning Trump’s mental fitness for office, various commentators have suggested he has malignant narcissism, Alzheimer’s disease or frontotemporal dementia, and is experiencing accelerating cognitive decline and a “profound psychological crisis”.

The claim of frontotemporal dementia in particular has stuck. This form of dementia can affect judgement, empathy, language skills and impulse control.

Trump’s critics say frontotemporal dementia explains his escalating threats, profanities and tendency to ramble.

But is frontotemporal dementia really the answer?

Diagnosing someone with this condition from afar is not only irresponsible – it’s impossible. It may also inadvertently give Trump an “out” for offensive but intentional behaviour, while increasing stigma for those who live with dementia.

What is frontotemporal dementia?

Frontotemporal dementia describes a group of neurodegenerative disorders that mostly affect the frontal and temporal lobes of the brain. These are regions involved in behaviour, personality, language and decision-making.

Unlike dementia due to Alzheimer’s disease, frontotemporal dementia rarely begins with memory loss. Instead, early symptoms involve changes in social conduct, emotional regulation or language abilities.

There are several variants. The most common is behavioural-variant, which presents as a gradual decline in how a person behaves, interacts with others and expresses their........

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