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Condition Literally Leaves You Scared Stiff

People with hyperekplexia can fall down at the slightest scare.

ByABC News
March 25, 2010, 6:50 PM

March 26, 2010— -- Karen Snyder used to laugh at her hyperekplexia. Like the obscure breed of "fainting goats" that fall down at any small startle, Snyder will crash to the floor with completely stiff limbs at a knock at the door or a tap on her shoulder.

Seconds later, Snyder's stiff body will relax and she can assess whatever damage has been done.

"I've knocked over displays in stores before. You can't control where you're going to get startled," said Snyder, 34, of Chico, Ariz. "Making cupcakes, I went down with a bag of frosting recently."

"I honestly hold hands with a lot of people these days just to try and stay upwards. It's a weird situation," she said. "I throw anything I'm holding and just fall to the floor."

Snyder first fell at a shock at the age of 19 when someone came into the bathroom while she was in the shower.

"My body jumps just like anybody else's body would jump. ... It's not really a sensation at all. It takes all of a second," said Snyder. "There's no voluntary movement that's available to you but at the same time you're totally conscious."

Snyder used to laugh at her mysterious condition, but as the years went on her sensitivity increased and the falls started happening several times a week. Eventually, she lost her job.

"It started happen at work, and my bosses were stressed out and said they had to have a doctor say I was cleared to work," said Snyder. "I couldn't do that because they [the doctors] didn't know what was going on."

Twelve years after her first fall, Snyder was diagnosed with hyperekplexia, one of the "startle syndromes" known to run in families.

The condition is so rare that experts can't even estimate how many people have hyperekplexia.

Yet, through Facebook and other social networking sites, families affected by hyperekplexia are starting to unite. Snyder and others recently started The Hyperekplexia Society, and more people are coming to the few doctors who specialize in hyperekplexia for diagnosis.

Snyder even sent a blood sample for analysis to Dr. Rhys Thomas and colleagues at Swansea University in the United Kingdom.