The mother of a Briton jailed in Japan has criticised the conditions in which he is being held.
Iris Baker says Nick has to sit on concrete floor in jail
Nick Baker, 34, from Stroud was jailed for 14 years in 2003, after drugs were found in a suitcase at Tokyo Airport.
His mother, Iris, said he was suffering from "severe back pain" because he was sitting on a concrete floor while in solitary confinement.
Mrs Baker said a doctor gave her son a clean bill of health which denied him access to something to sit on.
Baker has been in solitary confinement at the Tokyo Detention House for the past three years, and is currently appealing against his conviction.
He has claimed the suitcase containing the drugs belonged to another man, who fled the airport when he was arrested.
Mrs Baker, who lives in Wiltshire, said she first raised fears about her son's health in July 2004, when she said his eyesight and hearing were failing.
"If Nick's appeal fails he will be going to a far more barbaric place than he is now and I'm afraid that things will get far worse," she said.