The medics, from the UK, Australia, Europe and Sri Lanka express “serious concerns” about 48-year-old Assange’s fitness to stand trial in the letter addressed to Home Secretary Priti Patel.
He is being held in Belmarsh prison, in south-east London, ahead of a hearing in February to fight extradition to the US, where he faces 18 charges, including conspiring to hack into a Pentagon computer.
Assange is accused of working with former US army intelligence analyst Chelsea Manning to leak hundreds of thousands of classified documents.
The doctors are calling for Assange to be transferred to a university teaching hospital, where he can be assessed and treated by an expert medical team.
Read more: PA Media