Kate Moss is suffering from temporary paralysis in her right arm.
The supermodel has been diagnosed with a nerve disorder after waking up in the Ritz hotel in Paris, France, last weekend unable to move the limb.
A source told the Mail on Sunday newspaper: "Kate was at the Ritz when she woke and had no feeling in her arm, which was terrifying. She saw the hotel's doctor and when she came back, she got a second opinion.
"She has told her friends she has ulnar nerve entrapment, a common disorder that can result in a temporary paralysis.
"Her hand is not paralysed or injured in any permanent way."