Published: Sep 27, 2010 4:07 PM EDT
Updated: Sep 27, 2010 1:07 PM EDT

ORANGE BEACH, Ala. (AP) - Gulf Coast residents overcome by stress and worry are having a hard time dealing with the aftermath of the Deepwater Horizon rig explosion.

A survey shows 13 percent of coastal adults from Louisiana to Florida have suffered probable serious mental illnesses after the spill, although it's not clear exactly how many problems are directly related to oil.

Officials worry that many of the hardest-hit groups - shrimpers, Asian seafood workers and low-wage tourism employees - won't seek help for mental problems because of cultural taboos.

The level of probable mental illness is similar to that seen six months after Hurricane Katrina in 2005.

The study was conducted over the summer in 13 counties and parishes covering 1.9 million people.