TORONTO — Sore thumbs after spending hours on a hand-held e-mail device? Sounds like a case of "BlackBerry Thumb" — but help is at hand.

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The Hyatt hotel chain found so many of their business travelers were complaining of hand and arm discomfort that they introduced a special "BlackBerry Balm" hand massage at most of their North American spas.

Corporate spa director Kyra Johnson said guests began asking masseurs to spend more time on their hands and arms because of the growing popularity of PDA (personal digital assistant) devices like BlackBerrys and Treos.

The 30-minute massage, that costs about $30, begins with heat treatment and uses a "BlackBerry Balm." It "focuses on counteracting tension on various hand and arm muscles, specifically in the thumbs and overworked wrists," according to a Hyatt statement.

The American Physical Therapy Association recently recognized BlackBerry Thumb as an official work place malady — a stress-related injury due to over-use of any PDA or smartphone.

Ontario-based Research IN Motion Ltd's BlackBerry became a technological must-have in the late 1990s as a tool that delivers e-mail to users on the move. It is jokingly called a "CrackBerry" by many users.

Professor Alan Hedge, an ergonomics specialist at Cornell University in New York state, said the condition is caused by "highly repetitive, forceful thumb movements with the thumbs held back from the palms."

The symptoms are pain in the thumb and region around the base of the thumb and hand. Treatment typically consists of resting or strapping the thumb, anti-inflammatory medicines, cortisone injections and, as a last resort, surgery.

"It's a bit like the 'Nintendo thumb' of the '90s," said occupational therapist Andrew Morton, referring to young people who spent hours battering hand-held video game controllers with their thumbs.

Morton, who specializes in hand therapy at the University Hospital in London, Ontario, said this problem was going to become more common, with increasing numbers of hand-held electronic devices with small buttons being used.

Hedge recommended preventive measures like holding the device comfortably in the hands and close to the body, and not typing for more than five minutes without a break.

"Don't type 'War and Peace' with your thumbs! If you need to type long messages use an external keyboard for the device," Hedge said by e-mail.