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CHICAGO — They may be a big hit at kids’ birthday parties, but inflatable bounce houses can be dangerous, with the number of injuries soaring in recent years, a nationwide study found.

Kids often crowd into bounce houses, and jumping up and down can send other children flying into the air, too.

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The numbers suggest 30 U.S. children a day are treated in emergency rooms for broken bones, sprains, cuts and concussions from bounce house accidents. Most involve children falling inside or out of the inflated playthings, and many children get hurt when they collide with other bouncing kids.

The number of children aged 17 and younger who got emergency-room treatment for bounce house injuries has climbed along with the popularity of bounce houses — from fewer than 1,000 in 1995 to nearly 11,000 in 2010. That’s a 15-fold increase, and a doubling just since 2008.

“I was surprised by the number, especially by the rapid increase in the number of injuries,” said lead author Dr. Gary Smith, director of the Center for Injury Research and Policy at Nationwide Children’s Hospital in Columbus, Ohio.