Don't laugh. Workaholics can have a physiologic need for that adrenaline rush, says Robinson, a psychotherapist in Asheville, N.C., and professor emeritus at the University of North Carolina, Charlotte.

"One thing that we do know is that workaholics tend to seek out jobs that allow them to exercise their addiction," he says. "The workplace itself does not create the addiction any more than the supermarket creates food addiction, but it does enable it. Workaholics tend to seek high-stress jobs to keep the adrenaline rush going."

This is true even if they don't work outside the home.

"We're seeing more women workaholics now because women are more visible in the workplace. But it's my belief that even before this trend, workaholics were doing this in the home," says Robinson. "It could be in their parenting to the point where there is nothing else to balance their lives, no hobbies or fun or spirituality, because they spend all their time as the PTA president, running the youth sports league, and being a Scout leader."

Disorders Often Stem From Childhood

Research shows that the seeds of workaholism are often planted in childhood, resulting in low self-esteem that carries into adulthood.

"Many workaholics are the children of alcoholics or come from some other type of dysfunctional family, and work addiction is an attempt to control a situation that is not controllable," he tells WebMD. "Or they tend to be products of what I call 'looking good families' whose parents tend to be perfectionists and expect unreasonable success from their kids. These children grow up thinking that nothing is ever good enough. Some just throw in the towel, but others say, 'I'm going to show I'm the best in everything so [my] parents approve of me.'"

The problem is, perfection is unattainable, whether you're a kid or a successful professional.

"Anyone who carries a mandate for perfection is susceptible to workaholism because it creates a situation where the person never gets to cross the finish line, because it keeps moving farther out," says Saul.

That is why despite logging in mega hours and sacrificing their health and loved ones for their jobs, workaholics are frequently ineffective employees.

Workaholic Styles

"Overall, workaholics tend to be less effective than other workers because it's difficult for them to be team players, they have trouble delegating or entrusting co-workers, or they take on so much that they aren't as organized as others," says Robinson.

In fact, his research indicates four distinct workaholic "working styles":

The bulimic workaholic feels the job must be done perfectly or not at all. Bulimic workaholics often can't get started on projects, and then scramble to complete it by deadline, often frantically working to the point of exhaustion -- with sloppy results.
The relentless workaholic is the adrenaline junkie who often takes on more work than can possibly be done. In an attempt to juggle too many balls, they often work too fast or are too busy for careful, thorough results.
The attention-deficit workaholic often starts with fury, but fails to finish projects -- often because they lose interest for another project. They often savor the "brainstorming" aspects but get easily bored with the necessary details or follow-through.
The savoring workaholic is slow, methodical, and overly scrupulous. They often have trouble letting go of projects and don't work well with others. These are often consummate perfectionists, frequently missing deadlines because "it's not perfect."